Allowance for Credit Losses - Schedule of Non Accrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	$ 26,048	$ 18,822
Non accrual, no allowance including guaranteed loans	26,849	19,588
Non accrual including guaranteed loans	34,135	31,881
Total non accrual	33,263	31,003
Past due 90 days or more and still accruing	107	10
Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	801	766
Total non accrual	872	878
Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	16,944	12,014
Total non accrual	21,798	20,502
Past due 90 days or more and still accruing	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	7,995	6,128
Total non accrual	8,596	6,487
Past due 90 days or more and still accruing	0	0
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	1,535	1,379
Total non accrual	2,301	2,503
Past due 90 days or more and still accruing	107	10
Construction
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	64	67
Total non accrual	64	67
Past due 90 days or more and still accruing	0	0
Agriculture production
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	311	0
Total non accrual	1,376	2,322
Past due 90 days or more and still accruing	0	0
Leases
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	0	0
Total non accrual	0	0
Past due 90 days or more and still accruing	0	0
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	4,113	2,024
Total non accrual	4,113	2,024
Past due 90 days or more and still accruing	0	0
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	3,905	3,994
Total non accrual	3,905	3,994
Past due 90 days or more and still accruing	0	0
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	0	0
Total non accrual	0	0
Past due 90 days or more and still accruing	0	0
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	8,926	5,996
Total non accrual	13,780	14,484
Past due 90 days or more and still accruing	0	0
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	4,821	2,808
Total non accrual	5,094	2,811
Past due 90 days or more and still accruing	0	0
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	3,110	3,281
Total non accrual	3,403	3,571
Past due 90 days or more and still accruing	0	0
Other | Consumer
Financing Receivable, Past Due [Line Items]
Non accrual with no allowance for credit losses	64	39
Total non accrual	99	105
Past due 90 days or more and still accruing	$ 0	$ 0