Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Collateral-dependent Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 223,500	$ 219,400
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	101,385	99,888
Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	43,072	40,327
Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	79,045	79,207
Commercial real estate loans \| Non-farm/non-residential \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	91,536	93,550
Commercial real estate loans \| Non-farm/non-residential \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial real estate loans \| Non-farm/non-residential \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial real estate loans \| Construction/land development \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	8,179	5,849
Commercial real estate loans \| Construction/land development \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial real estate loans \| Construction/land development \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial real estate loans \| Agricultural \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	1,670	489
Commercial real estate loans \| Agricultural \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial real estate loans \| Agricultural \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Residential real estate loans \| Residential 1-4 family \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Residential real estate loans \| Residential 1-4 family \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	30,681	29,402
Residential real estate loans \| Residential 1-4 family \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Residential real estate loans \| Multifamily residential \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Residential real estate loans \| Multifamily residential \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	12,391	10,925
Residential real estate loans \| Multifamily residential \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Total real estate \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	101,385	99,888
Total real estate \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	43,072	40,327
Total real estate \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Consumer \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Consumer \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Consumer \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	12,153	13,616
Commercial and industrial \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial and industrial \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Commercial and industrial \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	65,612	64,367
Agricultural & other \| Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Agricultural & other \| Residential Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	0	0
Agricultural & other \| Other
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost	$ 1,280	$ 1,224