Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 4,916,624	$ 4,763,127
Total principal balance of loans owed, net of charge-offs	4,946,653	4,805,596
Unamortized net deferred loan fees	(13,922)	(16,984)
Discounts to principal balance of loans owed, net of charge-offs	(16,107)	(25,485)
Allowance for credit losses	(85,376)	(91,847)	$ (30,616)	$ (32,582)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	3,306,054	2,951,902
Allowance for credit losses	(51,140)	(53,693)	(11,995)	(12,944)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,071,551	952,108
Allowance for credit losses	(23,474)	(25,148)	(10,084)	(11,051)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	259,355	526,327
Allowance for credit losses	(3,862)	(4,252)	(4,867)	(5,610)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	222,281	284,842
Allowance for credit losses	(5,667)	(7,540)	(3,388)	(2,497)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	50,811	44,164
Allowance for credit losses	(1,215)	(1,209)	(261)	(480)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	6,572	3,784
Allowance for credit losses	(18)	(5)	(21)	0
CRE non-owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,603,141	1,535,555
Allowance for credit losses	(25,739)	(29,380)	(5,948)	(7,401)
CRE owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	706,307	624,375
Allowance for credit losses	(10,691)	(10,861)	(2,027)	(2,711)
Multifamily | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	823,500	639,480
Allowance for credit losses	(12,395)	(11,472)	(3,352)	(2,429)
Farmland | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	173,106	152,492
Allowance for credit losses	(2,315)	(1,980)	(668)	(403)
SFR 1-4 1st DT liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	666,960	546,592
SFR HELOCs and junior liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	337,513	327,484
Allowance for credit losses	(10,510)	(11,771)	(6,183)	(7,582)
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	67,078	78,032
Allowance for credit losses	$ (2,241)	$ (3,260)	$ (1,595)	$ (793)