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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	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	$ 81,087	$ 93,853
Nonaccrual with Reserve	31,981	28,768
Loans Past Due Over 90 Days Still Accruing	4,125	5,034
Commercial real estate loans | Non-farm/non-residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	22,301	35,868
Nonaccrual with Reserve	14,978	28,768
Loans Past Due Over 90 Days Still Accruing	1,136	304
Commercial real estate loans | Construction/land development
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	3,418	3,702
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	0	600
Commercial real estate loans | Agricultural
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	497	559
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	25,547	22,539
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,529	1,835
Residential real estate loans | Multifamily residential
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	12,907	13,083
Nonaccrual with Reserve	12,022	0
Loans Past Due Over 90 Days Still Accruing	0	0
Total real estate
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	64,670	75,751
Nonaccrual with Reserve	27,000	28,768
Loans Past Due Over 90 Days Still Accruing	2,665	2,739
Consumer
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	10,798	6,178
Nonaccrual with Reserve	4,981	0
Loans Past Due Over 90 Days Still Accruing	4	32
Commercial and industrial
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	4,349	10,931
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	1,456	2,263
Agricultural & other
Financing Receivable Nonaccrual Status [Line Items]
Nonaccrual	1,270	993
Nonaccrual with Reserve	0	0
Loans Past Due Over 90 Days Still Accruing	$ 0	$ 0

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