Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 6,422,421	$ 6,450,447
Total principal balance of loans owed, net of charge-offs	6,467,936	6,496,210
Unamortized net deferred loan fees	(16,423)	(15,275)
Discounts to principal balance of loans owed, net of charge-offs	(29,092)	(30,488)
Allowance for credit losses	(108,407)	(105,680)	$ (96,049)	$ (85,376)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,353,959	4,359,083
Allowance for credit losses	(64,937)	(61,381)	(54,992)	(51,140)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,233,797	1,240,743
Allowance for credit losses	(24,896)	(24,639)	(23,679)	(23,474)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	553,098	569,921
Allowance for credit losses	(12,069)	(13,597)	(9,042)	(3,862)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	225,996	211,560
Allowance for credit losses	(5,655)	(5,142)	(7,437)	(5,667)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	47,062	61,414
Allowance for credit losses	(833)	(906)	(883)	(1,215)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	8,509	7,726
Allowance for credit losses	(17)	(15)	(16)	(18)
CRE non-owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,161,059	2,149,725
Allowance for credit losses	(32,963)	(30,962)	(28,055)	(25,739)
CRE owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	971,210	984,807
Allowance for credit losses	(14,559)	(14,014)	(12,071)	(10,691)
Multifamily | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	946,693	944,537
Allowance for credit losses	(13,873)	(13,132)	(11,987)	(12,395)
Farmland | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	274,997	280,014
Allowance for credit losses	(3,542)	(3,273)	(2,879)	(2,315)
SFR 1-4 1st DT liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	803,407	790,349
SFR HELOCs and junior liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	375,591	393,666
Allowance for credit losses	(10,914)	(11,413)	(10,843)	(10,510)
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	54,799	56,728
Allowance for credit losses	$ (2,062)	$ (1,958)	$ (2,167)	$ (2,241)