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	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 183,199	$ 78,002
Nonaccrual with Reserve	24,248	29,846
Loans Past Due Over 90 Days Still Accruing	2,126	6,980
Commercial real estate loans \| Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	56,071	21,685
Nonaccrual with Reserve	8,899	14,752
Loans Past Due Over 90 Days Still Accruing	491	0
Commercial real estate loans \| Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	8,179	5,444
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	405
Commercial real estate loans \| Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,670	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	26,255	24,149
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,276	2,321
Residential real estate loans \| Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,391	10,925
Nonaccrual with Reserve	10,368	10,113
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	104,566	62,692
Nonaccrual with Reserve	19,267	24,865
Loans Past Due Over 90 Days Still Accruing	1,767	2,726
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,138	10,326
Nonaccrual with Reserve	4,981	4,981
Loans Past Due Over 90 Days Still Accruing	16	3,290
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	65,227	3,760
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	331	964
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,268	1,224
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 12	$ 0