Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 6,800,695	$ 6,794,470
Total principal balance of loans owed, net of charge-offs	6,839,589	6,834,935
Unamortized net deferred loan fees	(15,588)	(15,826)
Discounts to principal balance of loans owed, net of charge-offs	(23,306)	(24,639)
Allowance for credit losses	(124,394)	(121,522)	$ (108,407)	$ (105,680)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,443,768	4,394,802
Allowance for credit losses	(72,175)	(68,864)	(64,937)	(61,381)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,303,757	1,313,268
Allowance for credit losses	(27,441)	(27,453)	(24,896)	(24,639)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	549,780	586,455
Allowance for credit losses	(11,867)	(12,750)	(12,069)	(13,597)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	348,981	347,198
Allowance for credit losses	(9,162)	(8,856)	(5,655)	(5,142)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	145,159	144,497
Allowance for credit losses	(3,708)	(3,589)	(833)	(906)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	9,250	8,250
Allowance for credit losses	(41)	(10)	(17)	(15)
CRE non-owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,220,568	2,217,806
Allowance for credit losses	(36,687)	(35,077)	(32,963)	(30,962)
CRE owner occupied | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	974,968	956,440
Allowance for credit losses	(16,111)	(15,081)	(14,559)	(14,014)
Multifamily | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	982,290	949,502
Allowance for credit losses	(15,682)	(14,418)	(13,873)	(13,132)
Farmland | Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	265,942	271,054
Allowance for credit losses	(3,695)	(4,288)	(3,542)	(3,273)
SFR 1-4 1st DT liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	883,520	883,438
Allowance for credit losses	(14,140)	(14,009)	(11,920)	(11,268)
SFR HELOCs and junior liens | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	345,223	356,813
Allowance for credit losses	(9,942)	(10,273)	(10,914)	(11,413)
Other | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	75,014	73,017
Allowance for credit losses	$ (3,359)	$ (3,171)	$ (2,062)	$ (1,958)