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Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 6,742,526		$ 6,794,470
Total principal balance of loans owed, net of charge-offs	6,780,439		6,834,935
Unamortized net deferred loan fees	(15,457)		(15,826)
Discounts to principal balance of loans owed, net of charge-offs	(22,456)		(24,639)
Allowance for credit losses	(123,517)	$ (124,394)	(121,522)	$ (117,329)	$ (108,407)	$ (105,680)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,461,111		4,394,802
Allowance for credit losses	(73,032)	(72,175)	(68,864)	(71,016)	(64,937)	(61,381)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,300,727		1,313,268
Allowance for credit losses	(27,674)	(27,441)	(27,453)	(26,513)	(24,896)	(24,639)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	548,625		586,455
Allowance for credit losses	(12,128)	(11,867)	(12,750)	(11,647)	(12,069)	(13,597)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	283,374		347,198
Allowance for credit losses	(7,466)	(9,162)	(8,856)	(7,031)	(5,655)	(5,142)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	140,239		144,497
Allowance for credit losses	(3,180)	(3,708)	(3,589)	(1,105)	(833)	(906)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	8,450		8,250
Allowance for credit losses	(37)	(41)	(10)	(17)	(17)	(15)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,242,120		2,217,806
Allowance for credit losses	(37,155)	(36,687)	(35,077)	(33,042)	(32,963)	(30,962)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	952,496		956,440
Allowance for credit losses	(15,873)	(16,111)	(15,081)	(20,208)	(14,559)	(14,014)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,000,806		949,502
Allowance for credit losses	(15,973)	(15,682)	(14,418)	(14,075)	(13,873)	(13,132)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	265,689		271,054
Allowance for credit losses	(4,031)	(3,695)	(4,288)	(3,691)	(3,542)	(3,273)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	884,964		883,438
Allowance for credit losses	(14,604)	(14,140)	(14,009)	(13,134)	(11,920)	(11,268)
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	346,390		356,813
Allowance for credit losses	(10,087)	(9,942)	(10,273)	(10,608)	(10,914)	(11,413)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	69,373		73,017
Allowance for credit losses	$ (2,983)	$ (3,359)	$ (3,171)	$ (2,771)	$ (2,062)	$ (1,958)