Allowance for Credit Losses, Credit Quality and Other - Amortized Cost Basis of Loans on Nonaccrual Status and Loans Past Due Over 90 Days Still Accruing (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 179,639	$ 78,002
Nonaccrual with Reserve	29,874	29,846
Loans Past Due Over 90 Days Still Accruing	2,481	6,980
Commercial real estate loans \| Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	56,767	21,685
Nonaccrual with Reserve	14,530	14,752
Loans Past Due Over 90 Days Still Accruing	751	0
Commercial real estate loans \| Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	7,856	5,444
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	600	405
Commercial real estate loans \| Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	398	489
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	0
Residential real estate loans \| Residential 1-4 family
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	24,890	24,149
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	136	2,321
Residential real estate loans \| Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	11,175	10,925
Nonaccrual with Reserve	10,363	10,113
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	101,086	62,692
Nonaccrual with Reserve	24,893	24,865
Loans Past Due Over 90 Days Still Accruing	1,487	2,726
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,393	10,326
Nonaccrual with Reserve	4,981	4,981
Loans Past Due Over 90 Days Still Accruing	0	3,290
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	64,941	3,760
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	982	964
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,219	1,224
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 12	$ 0