$SFNC
SIMMONS FIRST NATIONAL CORP Stock $sfnc

$sfnc Overview Financials Valuation SEC Filings Company Website

2021 Q2 Form 10-Q Financial Statement

#000162828021016022 Filed on August 06, 2021

Income Statement

Concept	2021 Q2	2020 Q2	2020 Q1
Revenue	$167.0M	$191.7M	$209.2M
YoY Change	-12.88%	-1.84%	17.49%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$11.50M	$12.30M	$11.84M
YoY Change	-6.5%	44.71%	58.95%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$20.44M	$27.97M	$41.75M
YoY Change	-26.94%	-38.94%	-0.81%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$91.90M	$74.40M	$97.90M
YoY Change	23.52%	4.06%	62.9%
Income Tax	$17.02M	$15.59M	$20.69M
% Of Pretax Income	18.52%	20.96%	21.14%
Net Earnings	$74.92M	$58.80M	$77.24M
YoY Change	27.42%	5.15%	61.94%
Net Earnings / Revenue	44.87%	30.68%	36.91%
Basic Earnings Per Share	$0.69	$0.54	$0.68
Diluted Earnings Per Share	$0.69	$0.54	$0.68
COMMON SHARES
Basic Shares Outstanding	108.4M shares	109.0M shares	112.9M shares
Diluted Shares Outstanding	108.8M shares	109.1M shares	113.1M shares

Balance Sheet

Concept	2021 Q2	2020 Q2	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$2.339B	$2.545B	$1.737B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$430.0M	$479.0M	$485.0M
YoY Change	-10.23%	29.27%	45.32%
Goodwill	$1.100B	$1.065B	$1.065B
YoY Change	3.29%	14.95%	25.93%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$29.00M	$15.00M	$136.0M
YoY Change	93.33%	-16.67%	2620.0%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$23.42B	$21.90B	$20.84B
YoY Change	6.94%	22.11%	29.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$135.0M	$185.0M	$176.0M
YoY Change	-27.03%	71.3%	40.8%
Accrued Expenses	$35.00M	$35.00M	$38.00M
YoY Change	0.0%	0.0%	26.67%
Deferred Revenue
YoY Change
Short-Term Debt	$187.0M	$387.0M	$378.0M
YoY Change	-51.68%	197.69%	215.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$170.0M	$220.0M	$214.0M
YoY Change	-22.73%	53.85%	38.06%
LONG-TERM LIABILITIES
Long-Term Debt	$1.722B	$426.3M	$435.2M
YoY Change	304.03%	15.77%	17.94%
Other Long-Term Liabilities	$0.00	$0.00	$58.00M
YoY Change
Total Long-Term Liabilities	$1.722B	$426.3M	$435.2M
YoY Change	304.03%	15.77%	17.94%
TOTAL LIABILITIES
Total Short-Term Liabilities	$170.0M	$220.0M	$214.0M
Total Long-Term Liabilities	$1.722B	$426.3M	$435.2M
Total Liabilities	$20.38B	$19.00B	$18.00B
YoY Change	7.29%	22.83%	30.51%
SHAREHOLDERS EQUITY
Retained Earnings	$1.004B	$819.2M	$778.9M
YoY Change	22.6%	9.52%	10.04%
Common Stock	$1.084M	$1.090M	$1.090M
YoY Change	-0.55%	12.84%	17.71%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.039B	$2.905B	$2.845B
YoY Change
Total Liabilities & Shareholders Equity	$23.42B	$21.90B	$20.84B
YoY Change	6.94%	22.11%	29.52%

Cashflow Statement

Concept	2021 Q2	2020 Q2	2020 Q1
OPERATING ACTIVITIES
Net Income	$74.92M	$58.80M	$77.24M
YoY Change	27.42%	5.15%	61.94%
Depreciation, Depletion And Amortization	$11.50M	$12.30M	$11.84M
YoY Change	-6.5%	44.71%	58.95%
Cash From Operating Activities	$100.5M	-$16.60M	$103.6M
YoY Change	-705.42%	-162.64%	7.88%
INVESTING ACTIVITIES
Capital Expenditures	-$3.300M	-$9.200M	$10.57M
YoY Change	-64.13%	5.75%	-18.86%
Acquisitions
YoY Change
Other Investing Activities	-$1.622B	-$212.4M	$938.7M
YoY Change	663.79%	136.26%	520.83%
Cash From Investing Activities	-$1.626B	-$221.6M	$928.1M
YoY Change	633.62%	124.75%	571.63%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$93.31M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-41.20M	1.046B	-$291.1M
YoY Change	-103.94%	342.93%	-49.5%
NET CHANGE
Cash From Operating Activities	100.5M	-16.60M	$103.6M
Cash From Investing Activities	-1.626B	-221.6M	$928.1M
Cash From Financing Activities	-41.20M	1.046B	-$291.1M
Net Change In Cash	-1.566B	808.0M	$740.6M
YoY Change	-293.86%	392.38%	-316.35%
FREE CASH FLOW
Cash From Operating Activities	$100.5M	-$16.60M	$103.6M
Capital Expenditures	-$3.300M	-$9.200M	$10.57M
Free Cash Flow	$103.8M	-$7.400M	$93.04M
YoY Change	-1502.7%	-121.02%	12.07%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	217499000	USD
CY2021Q2	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	2123743000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Central Index Key EntityCentralIndexKey	0000090498
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
CY2021Q2	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-06253
	dei	Entity Registrant Name EntityRegistrantName	SIMMONS FIRST NATIONAL CORP
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	AR
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	71-0407808
	dei	Entity Address Address Line1 EntityAddressAddressLine1	501 Main Street
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	71601
	dei	Entity Address City Or Town EntityAddressCityOrTown	Pine Bluff
	dei	Entity Address State Or Province EntityAddressStateOrProvince	AR
	dei	City Area Code CityAreaCode	870
	dei	Local Phone Number LocalPhoneNumber	541-1000
	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	SFNC
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2021Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	108284170	shares
CY2021Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	215381000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	3254653000	USD
CY2021Q2	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	2339124000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	3472152000	USD
CY2021Q2	sfnc	Interest Bearing Balances Due From Banks Time InterestBearingBalancesDueFromBanksTime	1335000	USD
CY2020Q4	sfnc	Interest Bearing Balances Due From Banks Time InterestBearingBalancesDueFromBanksTime	1579000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1132000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	2915000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	931352000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	333031000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	312000	USD
CY2021Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6543022000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3397043000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6556581000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3473598000	USD
CY2021Q2	us-gaap	Debt Securities DebtSecurities	7487933000	USD
CY2020Q4	us-gaap	Debt Securities DebtSecurities	3806629000	USD
CY2021Q2	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	36011000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	137378000	USD
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11386352000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	12900897000	USD
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	227239000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	238050000	USD
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	11159113000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	12662847000	USD
CY2021Q2	sfnc	Property Plantand Equipmentand Rightof Use Assetafter Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetafterAccumulatedDepreciationandAmortization	429587000	USD
CY2020Q4	sfnc	Property Plantand Equipmentand Rightof Use Assetafter Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetafterAccumulatedDepreciationandAmortization	441692000	USD
CY2021Q2	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	6090000	USD
CY2020Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	15008000	USD
CY2021Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	15239000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	18393000	USD
CY2021Q2	us-gaap	Interest Receivable InterestReceivable	67916000	USD
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	72597000	USD
CY2021Q2	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	419198000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	255630000	USD
CY2021Q2	us-gaap	Goodwill Goodwill	1075305000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1075305000	USD
CY2021Q2	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	103759000	USD
CY2020Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	111110000	USD
CY2021Q2	us-gaap	Other Assets OtherAssets	282549000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	289432000	USD
CY2021Q2	us-gaap	Assets Assets	23423159000	USD
CY2020Q4	us-gaap	Assets Assets	22359752000	USD
CY2021Q2	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4893959000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	4482091000	USD
CY2021Q2	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	10569602000	USD
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	9672608000	USD
CY2021Q2	us-gaap	Time Deposits TimeDeposits	2841052000	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	2832327000	USD
CY2021Q2	us-gaap	Deposits Deposits	18304613000	USD
CY2020Q4	us-gaap	Deposits Deposits	16987026000	USD
CY2021Q2	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	187215000	USD
CY2020Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	299111000	USD
CY2021Q2	us-gaap	Other Borrowings OtherBorrowings	1339193000	USD
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	1342067000	USD
CY2021Q2	us-gaap	Subordinated Debt SubordinatedDebt	383143000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	382874000	USD
CY2021Q2	sfnc	Other Liabilities Held For Sale OtherLiabilitiesHeldForSale	0	USD
CY2020Q4	sfnc	Other Liabilities Held For Sale OtherLiabilitiesHeldForSale	154620000	USD
CY2021Q2	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	169629000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	217398000	USD
CY2021Q2	us-gaap	Liabilities Liabilities	20383793000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	19383096000	USD
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	40040000	shares
CY2021Q2	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	40040000	shares
CY2021Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2021Q2	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	767	shares
CY2021Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	767	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	767	shares
CY2021Q2	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	767	shares
CY2021Q2	us-gaap	Preferred Stock Value PreferredStockValue	767000	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	767000	USD
CY2021Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	175000000	shares
CY2021Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	108386669	shares
CY2021Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	108386669	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	108077662	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	108077662	shares
CY2021Q2	us-gaap	Common Stock Value CommonStockValue	1084000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	1081000	USD
CY2021Q2	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2021128000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2014076000	USD
CY2021Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1004314000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	901006000	USD
CY2021Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	12073000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	59726000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	3039366000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2976656000	USD
CY2021Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	23423159000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22359752000	USD
CY2021Q2	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	138804000	USD
CY2020Q2	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	176910000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	285228000	USD
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	364476000	USD
CY2021Q2	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	651000	USD
CY2020Q2	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	603000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1449000	USD
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	3044000	USD
CY2021Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	27128000	USD
CY2020Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	13473000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	48701000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	32416000	USD
CY2021Q2	sfnc	Interestand Fee Income Mortgage Loans Heldforsale InterestandFeeIncomeMortgageLoansHeldforsale	386000	USD
CY2020Q2	sfnc	Interestand Fee Income Mortgage Loans Heldforsale InterestandFeeIncomeMortgageLoansHeldforsale	668000	USD
	sfnc	Interestand Fee Income Mortgage Loans Heldforsale InterestandFeeIncomeMortgageLoansHeldforsale	1025000	USD
	sfnc	Interestand Fee Income Mortgage Loans Heldforsale InterestandFeeIncomeMortgageLoansHeldforsale	949000	USD
CY2021Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	166969000	USD
CY2020Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	191654000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	336403000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	400885000	USD
CY2021Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10782000	USD
CY2020Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	18006000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	23961000	USD
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	49283000	USD
CY2021Q2	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	192000	USD
CY2020Q2	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	337000	USD
	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	437000	USD
	us-gaap	Interest Expense Federal Funds Purchased And Securities Sold Under Agreements To Repurchase InterestExpenseFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	1096000	USD
CY2021Q2	us-gaap	Interest Expense Other InterestExpenseOther	4897000	USD
CY2020Q2	us-gaap	Interest Expense Other InterestExpenseOther	4963000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	9699000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	9840000	USD
CY2021Q2	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	4565000	USD
CY2020Q2	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	4667000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	9092000	USD
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	9502000	USD
CY2021Q2	us-gaap	Interest Expense InterestExpense	20436000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	27973000	USD
	us-gaap	Interest Expense InterestExpense	43189000	USD
	us-gaap	Interest Expense InterestExpense	69721000	USD
CY2021Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	146533000	USD
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	163681000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	293214000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	331164000	USD
CY2021Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-12951000	USD
CY2020Q2	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	21915000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-11506000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	45049000	USD
CY2021Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	159484000	USD
CY2020Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	141766000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	304720000	USD
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	286115000	USD
CY2021Q2	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	654000	USD
CY2020Q2	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	571000	USD
	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	1349000	USD
	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	1448000	USD
CY2021Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2038000	USD
CY2020Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1445000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3561000	USD
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	2743000	USD
CY2021Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	5127000	USD
CY2020Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	390000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	10598000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	32485000	USD
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8110000	USD
CY2020Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9809000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	18370000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	22610000	USD
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	47924000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	48806000	USD
	us-gaap	Noninterest Income NoninterestIncome	98264000	USD
	us-gaap	Noninterest Income NoninterestIncome	129851000	USD
CY2021Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	60261000	USD
CY2020Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	57644000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	120601000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	125568000	USD
CY2021Q2	us-gaap	Occupancy Net OccupancyNet	9103000	USD
CY2020Q2	us-gaap	Occupancy Net OccupancyNet	9217000	USD
	us-gaap	Occupancy Net OccupancyNet	18403000	USD
	us-gaap	Occupancy Net OccupancyNet	18727000	USD
CY2021Q2	us-gaap	Equipment Expense EquipmentExpense	4859000	USD
CY2020Q2	us-gaap	Equipment Expense EquipmentExpense	6144000	USD
	us-gaap	Equipment Expense EquipmentExpense	10274000	USD
	us-gaap	Equipment Expense EquipmentExpense	11867000	USD
CY2021Q2	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	863000	USD
CY2020Q2	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	274000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	1206000	USD
	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	599000	USD
CY2021Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1687000	USD
CY2020Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2838000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2995000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	5313000	USD
CY2021Q2	us-gaap	Acquisition Costs AcquisitionCosts	686000	USD
CY2020Q2	us-gaap	Acquisition Costs AcquisitionCosts	1830000	USD
	us-gaap	Acquisition Costs AcquisitionCosts	919000	USD
	us-gaap	Acquisition Costs AcquisitionCosts	2898000	USD
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	38007000	USD
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	38230000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	74861000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	78669000	USD
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	115466000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	116177000	USD
	us-gaap	Noninterest Expense NoninterestExpense	229259000	USD
	us-gaap	Noninterest Expense NoninterestExpense	243641000	USD
CY2021Q2	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	91942000	USD
CY2020Q2	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	74395000	USD
	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	173725000	USD
	us-gaap	Income Loss Attributable To Parent IncomeLossAttributableToParent	172325000	USD
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17018000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15593000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31381000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36287000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	74924000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	58802000	USD
	us-gaap	Net Income Loss NetIncomeLoss	142344000	USD
	us-gaap	Net Income Loss NetIncomeLoss	136038000	USD
CY2021Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	13000	USD
CY2020Q2	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	13000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	26000	USD
	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	26000	USD
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	74911000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	58789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	142318000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	136012000	USD
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.23
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.22
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-11506000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	45049000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	74924000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	58802000	USD
	us-gaap	Net Income Loss NetIncomeLoss	142344000	USD
	us-gaap	Net Income Loss NetIncomeLoss	136038000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	71801000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	22159000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-53916000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	77728000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	5127000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	390000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	10598000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	32485000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	66674000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	21769000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-64514000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	45243000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	17425000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	5689000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-16861000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11824000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	49249000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16080000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-47653000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	33419000	USD
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	124173000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	74882000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	94691000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169457000	USD
	us-gaap	Net Income Loss NetIncomeLoss	142344000	USD
	us-gaap	Net Income Loss NetIncomeLoss	136038000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	23837000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	24148000	USD
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	10598000	USD
	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	32485000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	24377000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	30078000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	269000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	271000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7592000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7577000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	606000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	177000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	400000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	20006000	USD
	us-gaap	Gain Loss On Sale Of Mortgage Loans GainLossOnSaleOfMortgageLoans	14993000	USD
	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	0	USD
	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	301000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	5300000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	8094000	USD
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	1465000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6315000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4616000	USD
	sfnc	Bank Owned Life Insuranceand Death Benefits Income BankOwnedLifeInsuranceandDeathBenefitsIncome	3630000	USD
	sfnc	Bank Owned Life Insuranceand Death Benefits Income BankOwnedLifeInsuranceandDeathBenefitsIncome	3245000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	534124000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	470797000	USD
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	655497000	USD
	us-gaap	Proceeds From Sale Of Mortgage Loans Held For Sale ProceedsFromSaleOfMortgageLoansHeldForSale	423858000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-4680000	USD
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	18021000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2402000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	19676000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-58284000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	76265000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	6786000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-34233000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	176310000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	86964000	USD
	sfnc	Proceeds From Loan Originations And Principal Collections Net ProceedsFromLoanOriginationsAndPrincipalCollectionsNet	-1520504000	USD
	sfnc	Proceeds From Loan Originations And Principal Collections Net ProceedsFromLoanOriginationsAndPrincipalCollectionsNet	318795000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	1847000	USD
	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	4600000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	244000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-7000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5829000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	19784000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5156000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	10988000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	6173000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	249454000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1201778000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	314547000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2048453000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3672029000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2386878000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	9479000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	5932000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	606187000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	16997000	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	160000000	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	3032000	USD
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	763000	USD
	sfnc	Proceeds From Divestiture Of Businesses Net Of Liabilities ProceedsFromDivestitureOfBusinessesNetOfLiabilities	-134166000	USD
	sfnc	Proceeds From Divestiture Of Businesses Net Of Liabilities ProceedsFromDivestitureOfBusinessesNetOfLiabilities	181261000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2462960000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	706499000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	1307965000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	561185000	USD
	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	5927000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	26000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	26000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	39010000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	37606000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-2874000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	96090000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-111896000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	236880000	USD
	sfnc	Proceeds From Payments For Issuanceof Shares Sharebased Payment Arrangement Including Option Exercised And Canceled ProceedsFromPaymentsForIssuanceofSharesSharebasedPaymentArrangementIncludingOptionExercisedAndCanceled	1373000	USD
	sfnc	Proceeds From Payments For Issuanceof Shares Sharebased Payment Arrangement Including Option Exercised And Canceled ProceedsFromPaymentsForIssuanceofSharesSharebasedPaymentArrangementIncludingOptionExercisedAndCanceled	-3171000	USD
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1170000	USD
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	956000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3080000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	93307000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1153622000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	755074000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1133028000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1548537000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3472152000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	996623000	USD
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2339124000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2545160000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	2930775000	USD
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	124173000	USD
CY2021Q2	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	40937	shares
CY2021Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3941000	USD
CY2021Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	13000	USD
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2021Q2	us-gaap	Dividends Common Stock DividendsCommonStock	19510000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	8965000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	130916	shares
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	3039366000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	2845400000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	74882000	USD
CY2020Q2	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	28058	shares
CY2020Q2	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2963000	USD
CY2020Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	13000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.17
CY2020Q2	us-gaap	Dividends Common Stock DividendsCommonStock	18529000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	2904703000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2976656000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	94691000	USD
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	60697	shares
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1170000	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	379226	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3080000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	26000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.36
	us-gaap	Dividends Common Stock DividendsCommonStock	39010000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	3039366000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2988924000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169457000	USD
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	43681	shares
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	956000	USD
	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	244443	shares
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4406000	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	4922336	shares
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	93307000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	26000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.34
	us-gaap	Dividends Common Stock DividendsCommonStock	37606000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	2904703000	USD
CY2021Q2	sfnc	Number Of Financial Centers NumberOfFinancialCenters	198	financialCenter
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	ertain prior year amounts, have been reclassified to conform to the current year financial statement presentation. These changes and reclassifications did not impact previously reported net income or comprehensive income.
CY2021Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	932484000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1132000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	931352000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	9550000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	5306000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	935596000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	335946000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	2915000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	333031000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	8924000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	30000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	341925000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6543022000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	59361000	USD
CY2021Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	45802000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6556581000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	3397043000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	312000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	79663000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2796000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	3473598000	USD
CY2021Q2	sfnc	Debt Securities Heldtomaturity Interest Receivable DebtSecuritiesHeldtomaturityInterestReceivable	4200000	USD
CY2021Q2	sfnc	Debt Securities Availableforsale Interest Receivable DebtSecuritiesAvailableforsaleInterestReceivable	21800000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	3145328000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	45300000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	38637000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	502000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3183965000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	45802000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6600000000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3200000000	USD
CY2021Q2	sfnc	Debt Securities Unrealized Loss Position Quantitative Disclosure Percent DebtSecuritiesUnrealizedLossPositionQuantitativeDisclosurePercent	0.486
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	11000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	-301000	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1618000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-486000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1132000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	2454000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	-2454000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	2915000	USD
	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-1183000	USD
	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Writeoff DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff	600000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	1132000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	312000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	409000	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-102000	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	307000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	269000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	530000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	-190000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	609000	USD
CY2019Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	USD
	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-62000	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	307000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	269000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	142000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	109000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	609000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	-2454000	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	-312000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	340000	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	236000	USD
CY2021Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	27128000	USD
CY2020Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	13473000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	48701000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	32416000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	6819000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	6884000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	11777000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	11834000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	7680000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	8029000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	51854000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	52281000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	9734000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	10115000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	531599000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	537748000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	847602000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	850174000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1949938000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1966476000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	60649000	USD
	us-gaap	Availableforsale Securities Sold At Par AvailableforsaleSecuritiesSoldAtPar	249500000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	60394000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3996823000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	3987209000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	1031000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	1033000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	932484000	USD
CY2021Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	935596000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	6543022000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	6556581000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	3890000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	2010000000.00	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	5200000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	26000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	10600000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	39000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	391000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-1000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	32500000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-2600	USD
CY2020Q2	us-gaap	Availableforsale Securities Sold At Par AvailableforsaleSecuritiesSoldAtPar	1200000000	USD
	sfnc	Income Tax Benefit Related To Security Gains Losses Percentage IncomeTaxBenefitRelatedToSecurityGainsLossesPercentage	0.26135
	sfnc	Income Tax Benefit Related To Security Gains Losses Percentage IncomeTaxBenefitRelatedToSecurityGainsLossesPercentage	0.26135
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11390000000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	12900000000	USD
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11386352000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	12900897000	USD
	us-gaap	Financing Receivable Purchased With Credit Deterioration Discount Premium FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium	43700000	USD
CY2020	us-gaap	Financing Receivable Purchased With Credit Deterioration Discount Premium FinancingReceivablePurchasedWithCreditDeteriorationDiscountPremium	57300000	USD
CY2021Q2	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	41900000	USD
CY2020Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	54400000	USD
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	147000	USD
CY2021Q2	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	80282000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	122879000	USD
CY2021Q2	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	15700000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	16800000	USD
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	11386352000	USD
CY2021Q2	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	653000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	12900897000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	578000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	loan
CY2021Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	784000	USD
CY2021Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	784000	USD
CY2020Q2	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	loan
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	loan
CY2020Q2	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	147000	USD
CY2021Q2	sfnc	Financing Receivable Collateral Dependent Amount FinancingReceivableCollateralDependentAmount	74800000	USD
CY2021Q2	sfnc	Financing Receivable Collateral Dependent Amount FinancingReceivableCollateralDependentAmount	74815000	USD
CY2020Q2	sfnc	Number Of Energy Credits NumberOfEnergyCredits	4	credit
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	22400000	USD
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	22400000	USD
CY2021Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	0	USD
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	0	USD
CY2020Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-5000000.0	USD
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-8000000.0	USD
CY2021Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-10011000	USD
CY2020Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	26678000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-10011000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	52875000	USD
CY2021Q2	sfnc	Provision For Unfunded Commitments ProvisionForUnfundedCommitments	0	USD
CY2020Q2	sfnc	Provision For Unfunded Commitments ProvisionForUnfundedCommitments	-5001000	USD
	sfnc	Provision For Unfunded Commitments ProvisionForUnfundedCommitments	0	USD
	sfnc	Provision For Unfunded Commitments ProvisionForUnfundedCommitments	-8000000	USD
CY2021Q2	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-486000	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-102000	USD
	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-1183000	USD
	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-62000	USD
CY2021Q2	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	-2454000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	340000	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	-312000	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	236000	USD
CY2021Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-12951000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	21915000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-11506000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	45049000	USD
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	34748000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	31348000	USD
CY2021Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	35072000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	31433000	USD
CY2021Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y3M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y6M18D
CY2021Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0279
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0309
CY2021Q2	us-gaap	Operating Lease Expense OperatingLeaseExpense	2900000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	5700000	USD
CY2020Q2	us-gaap	Operating Lease Expense OperatingLeaseExpense	3400000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	6600000	USD
CY2021Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	34748000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	31348000	USD
CY2021Q2	sfnc	Property Plantand Equipmentand Rightof Use Asset Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetAccumulatedDepreciationandAmortization	156380000	USD
CY2020Q4	sfnc	Property Plantand Equipmentand Rightof Use Asset Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetAccumulatedDepreciationandAmortization	140450000	USD
CY2021Q2	sfnc	Property Plantand Equipmentand Rightof Use Assetafter Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetafterAccumulatedDepreciationandAmortization	429587000	USD
CY2020Q4	sfnc	Property Plantand Equipmentand Rightof Use Assetafter Accumulated Depreciationand Amortization PropertyPlantandEquipmentandRightofUseAssetafterAccumulatedDepreciationandAmortization	441692000	USD
CY2021Q2	us-gaap	Goodwill Goodwill	1100000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	1100000000	USD
CY2020Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103759000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	111110000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103759000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	111110000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	6663000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	13275000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12992000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12090000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9505000	USD
CY2021Q2	sfnc	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	49234000	USD
CY2021Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103759000	USD
CY2021Q2	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	2100000000	USD
CY2020Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	2030000000.00	USD
CY2021Q2	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	1000000000.00	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	889800000	USD
CY2021Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13930000	USD
CY2020Q2	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9391000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	25066000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	31671000	USD
CY2021Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3088000	USD
CY2020Q2	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6202000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6315000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4616000	USD
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17018000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15593000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31381000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36287000	USD
CY2021Q2	sfnc	Deferred Tax Assets Loans Acquired DeferredTaxAssetsLoansAcquired	7084000	USD
CY2020Q4	sfnc	Deferred Tax Assets Loans Acquired DeferredTaxAssetsLoansAcquired	10100000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	55064000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	58028000	USD
CY2021Q2	sfnc	Deferred Tax Assets On Foreclosed Assets DeferredTaxAssetsOnForeclosedAssets	1673000	USD
CY2020Q4	sfnc	Deferred Tax Assets On Foreclosed Assets DeferredTaxAssetsOnForeclosedAssets	1673000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Other Loss Carryforwards DeferredTaxAssetsOtherLossCarryforwards	14720000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other Loss Carryforwards DeferredTaxAssetsOtherLossCarryforwards	16028000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3267000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	3060000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	5081000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	5905000	USD
CY2021Q2	sfnc	Deferred Tax Assets Acquired Securities DeferredTaxAssetsAcquiredSecurities	491000	USD
CY2020Q4	sfnc	Deferred Tax Assets Acquired Securities DeferredTaxAssetsAcquiredSecurities	587000	USD
CY2021Q2	sfnc	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	8742000	USD
CY2020Q4	sfnc	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	7835000	USD
CY2021Q2	sfnc	Deferred Tax Assets Tax Deferred Expense Reservesand Accruals Unfunded Commitments DeferredTaxAssetsTaxDeferredExpenseReservesandAccrualsUnfundedCommitments	5583000	USD
CY2020Q4	sfnc	Deferred Tax Assets Tax Deferred Expense Reservesand Accruals Unfunded Commitments DeferredTaxAssetsTaxDeferredExpenseReservesandAccrualsUnfundedCommitments	5583000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7578000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7600000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	109283000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	116399000	USD
CY2021Q2	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	37914000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	38882000	USD
CY2021Q2	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19305000	USD
CY2021Q2	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	33670000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	34667000	USD
CY2021Q2	sfnc	Deferred Tax Liabilities Operating Right Of Use Assets DeferredTaxLiabilitiesOperatingRightOfUseAssets	8661000	USD
CY2020Q4	sfnc	Deferred Tax Liabilities Operating Right Of Use Assets DeferredTaxLiabilitiesOperatingRightOfUseAssets	7813000	USD
CY2021Q2	sfnc	Deferred Tax Liabilities Unrealized Gainson Availablefor Sale Securities Gross DeferredTaxLiabilitiesUnrealizedGainsonAvailableforSaleSecuritiesGross	2058000	USD
CY2020Q4	sfnc	Deferred Tax Liabilities Unrealized Gainson Availablefor Sale Securities Gross DeferredTaxLiabilitiesUnrealizedGainsonAvailableforSaleSecuritiesGross	17521000	USD
CY2021Q2	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4335000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4021000	USD
CY2021Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	86638000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	102904000	USD
CY2021Q2	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	22645000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	13495000	USD
CY2020Q2	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	15620000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	36477000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	36180000	USD
CY2021Q2	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1488000	USD
CY2020Q2	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2296000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3378000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4359000	USD
CY2021Q2	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-66000	USD
CY2020Q2	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	43000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	37000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	69000	USD
CY2021Q2	sfnc	Income Tax Rate Reconciliation Tax Exempt Interest Income IncomeTaxRateReconciliationTaxExemptInterestIncome	2741000	USD
CY2020Q2	sfnc	Income Tax Rate Reconciliation Tax Exempt Interest Income IncomeTaxRateReconciliationTaxExemptInterestIncome	1421000	USD
	sfnc	Income Tax Rate Reconciliation Tax Exempt Interest Income IncomeTaxRateReconciliationTaxExemptInterestIncome	5251000	USD
	sfnc	Income Tax Rate Reconciliation Tax Exempt Interest Income IncomeTaxRateReconciliationTaxExemptInterestIncome	2842000	USD
CY2021Q2	sfnc	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	319000	USD
CY2020Q2	sfnc	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	212000	USD
	sfnc	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	560000	USD
	sfnc	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	531000	USD
CY2021Q2	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	589000	USD
CY2020Q2	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1034000	USD
	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1179000	USD
	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	2068000	USD
CY2021Q2	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-60000	USD
CY2020Q2	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	301000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1521000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1120000	USD
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17018000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15593000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31381000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36287000	USD
CY2021Q2	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	172200000	USD
CY2020Q4	us-gaap	Financial Assets Sold Under Agreements To Repurchase Gross Including Not Subject To Master Netting Arrangement FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement	248900000	USD
	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of June 30, 2021 and December 31, 2020 is presented in the following tables.<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> </span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:32.808%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.543%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.518%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.543%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.518%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.543%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.518%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.543%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.518%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.548%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td colspan="27" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Remaining Contractual Maturity of the Agreements</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(In thousands)</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Overnight and<br/>Continuous</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Up to 30 Days</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">30-90 Days</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Greater than<br/>90 Days</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Total</span></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">June 30, 2021</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%"> </span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 10pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Repurchase agreements:</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 23.5pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">U.S. Government agencies</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">172,215 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">172,215 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">December 31, 2020</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 10pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Repurchase agreements:</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 23.5pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">U.S. Government agencies</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">248,861 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:100%">248,861 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div>
CY2021Q2	us-gaap	Long Term Debt LongTermDebt	1722336000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	1724941000	USD
CY2021Q2	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	1310000000	USD
CY2021Q2	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	1300000000	USD
CY2021Q2	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	4900000000	USD
	sfnc	Stock Repurchased During Period Value Average StockRepurchasedDuringPeriodValueAverage	23.53
CY2021Q2	sfnc	Advances From Federal Home Loan Bank Available AdvancesFromFederalHomeLoanBankAvailable	3500000000	USD
CY2021Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear	923000	USD
CY2021Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1727000	USD
CY2021Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1686000	USD
CY2021Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	2327000	USD
CY2021Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	4876000	USD
CY2021Q2	sfnc	Long Term Debt Maturity After Year Four LongTermDebtMaturityAfterYearFour	1710797000	USD
CY2021Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1722336000	USD
CY2009Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	40040000	shares
CY2009Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q2	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	180000000	shares
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	126500000	shares
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	130916	shares
CY2021Q2	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0	shares
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4922336	shares
	sfnc	Stock Repurchased During Period Value Average StockRepurchasedDuringPeriodValueAverage	18.96
	sfnc	Threshold Percentage Of Net Profits Exceeded By Dividends Declared Any Calendar Year ThresholdPercentageOfNetProfitsExceededByDividendsDeclaredAnyCalendarYear	0.75
	sfnc	Threshold Percentage Of Net Profits Exceeded By Dividends Declared Combined With Preceding Year ThresholdPercentageOfNetProfitsExceededByDividendsDeclaredCombinedWithPrecedingYear	0.75
CY2021Q2	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments Without Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval	99300000	USD
CY2021Q2	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05
CY2021Q2	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08
CY2021Q2	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10
CY2021Q2	sfnc	Common Equity Tier1 Ratio Required To Be Well Capitalized CommonEquityTier1RatioRequiredToBeWellCapitalized	0.065
CY2021Q2	sfnc	Capital Conservation Buffer CapitalConservationBuffer	0.025
CY2021Q2	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1420
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	658000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.48
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	183000	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	22.50
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
CY2021Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	475000	shares
CY2021Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.47
CY2021Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	475000	shares
CY2021Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	22.47
	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	9.46
	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	24.07
CY2021Q2	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	475000	shares
	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P4Y18D
CY2021Q2	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	22.47
CY2021Q2	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	475000	shares
CY2021Q2	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	22.47
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7600000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7600000	USD
CY2021Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	0	USD
CY2021Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	19600000	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y10M24D
CY2021Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	3300000	USD
CY2021Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	3300000	USD
CY2021Q2	us-gaap	Share Price SharePrice	29.34
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1300000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	109130000	shares
CY2021Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	74911000	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	58789000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	142318000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	136012000	USD
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108362000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108982000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	108286000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110936000	shares
CY2021Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	460000	shares
CY2020Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	148000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	460000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	148000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	108822000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	108746000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111084000	shares
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.69
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.31
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.23
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.31
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.22
	us-gaap	Interest Paid Net InterestPaidNet	44281000	USD
	us-gaap	Interest Paid Net InterestPaidNet	72146000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-32980000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3196000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	4368000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Financing Receivable Reclassification To Held For Sale FinancingReceivableReclassificationToHeldForSale	0	USD
	us-gaap	Financing Receivable Reclassification To Held For Sale FinancingReceivableReclassificationToHeldForSale	114925000	USD
	sfnc	Transferof Depositsto Other Liabilities Heldforsale TransferofDepositstoOtherLiabilitiesHeldforsale	0	USD
	sfnc	Transferof Depositsto Other Liabilities Heldforsale TransferofDepositstoOtherLiabilitiesHeldforsale	58405000	USD
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8100000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	18400000	USD
CY2020Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9800000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	22600000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	5900000	USD
	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	8100000	USD
CY2021Q2	us-gaap	Professional Fees ProfessionalFees	4561000	USD
CY2020Q2	us-gaap	Professional Fees ProfessionalFees	3921000	USD
	us-gaap	Professional Fees ProfessionalFees	9808000	USD
	us-gaap	Professional Fees ProfessionalFees	9750000	USD
CY2021Q2	us-gaap	Postage Expense PostageExpense	1943000	USD
CY2020Q2	us-gaap	Postage Expense PostageExpense	1769000	USD
	us-gaap	Postage Expense PostageExpense	4313000	USD
	us-gaap	Postage Expense PostageExpense	4005000	USD
CY2021Q2	us-gaap	Communication Communication	1610000	USD
CY2020Q2	us-gaap	Communication Communication	2450000	USD
	us-gaap	Communication Communication	3242000	USD
	us-gaap	Communication Communication	4635000	USD
CY2021Q2	sfnc	Credit Card Expense CreditCardExpense	3339000	USD
CY2020Q2	sfnc	Credit Card Expense CreditCardExpense	3161000	USD
	sfnc	Credit Card Expense CreditCardExpense	6461000	USD
	sfnc	Credit Card Expense CreditCardExpense	6194000	USD
CY2021Q2	us-gaap	Marketing Expense MarketingExpense	4740000	USD
CY2020Q2	us-gaap	Marketing Expense MarketingExpense	3528000	USD
	us-gaap	Marketing Expense MarketingExpense	7893000	USD
	us-gaap	Marketing Expense MarketingExpense	7913000	USD
CY2021Q2	sfnc	Softwareand Technology Expense SoftwareandTechnologyExpense	9857000	USD
CY2020Q2	sfnc	Softwareand Technology Expense SoftwareandTechnologyExpense	10024000	USD
	sfnc	Softwareand Technology Expense SoftwareandTechnologyExpense	20108000	USD
	sfnc	Softwareand Technology Expense SoftwareandTechnologyExpense	19469000	USD
CY2021Q2	us-gaap	Supplies Expense SuppliesExpense	838000	USD
CY2020Q2	us-gaap	Supplies Expense SuppliesExpense	828000	USD
	us-gaap	Supplies Expense SuppliesExpense	1408000	USD
	us-gaap	Supplies Expense SuppliesExpense	1764000	USD
CY2021Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3332000	USD
CY2020Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3369000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6676000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6782000	USD
CY2021Q2	sfnc	Branch Right Sizing Expense BranchRightSizingExpense	468000	USD
CY2020Q2	sfnc	Branch Right Sizing Expense BranchRightSizingExpense	1721000	USD
	sfnc	Branch Right Sizing Expense BranchRightSizingExpense	1093000	USD
	sfnc	Branch Right Sizing Expense BranchRightSizingExpense	1959000	USD
CY2021Q2	us-gaap	Other General Expense OtherGeneralExpense	7319000	USD
CY2020Q2	us-gaap	Other General Expense OtherGeneralExpense	7459000	USD
	us-gaap	Other General Expense OtherGeneralExpense	13859000	USD
	us-gaap	Other General Expense OtherGeneralExpense	16198000	USD
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	38007000	USD
CY2020Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	38230000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	74861000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	78669000	USD
CY2021Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	41900000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	49000000.0	USD

Files In Submission

Name	View Source	Status
0001628280-21-016022-index-headers.html	Edgar Link	pending
0001628280-21-016022-index.html	Edgar Link	pending
0001628280-21-016022.txt	Edgar Link	pending
0001628280-21-016022-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
sfnc-063021xex151.htm	Edgar Link	pending
sfnc-063021xex311.htm	Edgar Link	pending
sfnc-063021xex312.htm	Edgar Link	pending
sfnc-063021xex313.htm	Edgar Link	pending
sfnc-063021xex321.htm	Edgar Link	pending
sfnc-063021xex322.htm	Edgar Link	pending
sfnc-063021xex323.htm	Edgar Link	pending
sfnc-20210630.htm	Edgar Link	pending
sfnc-20210630.xsd	Edgar Link	pending
sfnc-20210630_cal.xml	Edgar Link	unprocessable
sfnc-20210630_def.xml	Edgar Link	unprocessable
sfnc-20210630_g1.jpg	Edgar Link	pending
sfnc-20210630_htm.xml	Edgar Link	completed
sfnc-20210630_lab.xml	Edgar Link	unprocessable
sfnc-20210630_pre.xml	Edgar Link	unprocessable
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$SFNC
SIMMONS FIRST NATIONAL CORP Stock $sfnc

2021 Q2 Form 10-Q Financial Statement

#000162828021016022 Filed on August 06, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SFNC SIMMONS FIRST NATIONAL CORP Stock $sfnc

2021 Q2 Form 10-Q Financial Statement

#000162828021016022 Filed on August 06, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SFNC
SIMMONS FIRST NATIONAL CORP Stock $sfnc