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Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 6,683,891		$ 6,794,470
Total principal balance of loans owed, net of charge-offs	6,720,629		6,834,935
Unamortized net deferred loan fees	(15,298)		(15,826)
Discounts to principal balance of loans owed, net of charge-offs	(21,440)		(24,639)
Allowance for credit losses on loans	(123,760)	$ (123,517)	(121,522)	$ (115,812)	$ (117,329)	$ (105,680)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,487,524		4,394,802
Allowance for credit losses on loans	(71,339)	(73,032)	(68,864)	(66,675)	(71,016)	(61,381)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,283,963		1,313,268
Allowance for credit losses on loans	(27,504)	(27,674)	(27,453)	(26,618)	(26,513)	(24,639)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	484,763		586,455
Allowance for credit losses on loans	(14,453)	(12,128)	(12,750)	(12,290)	(11,647)	(13,597)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	276,095		347,198
Allowance for credit losses on loans	(7,119)	(7,466)	(8,856)	(8,097)	(7,031)	(5,142)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	144,123		144,497
Allowance for credit losses on loans	(3,312)	(3,180)	(3,589)	(2,125)	(1,105)	(906)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	7,423		8,250
Allowance for credit losses on loans	(33)	(37)	(10)	(7)	(17)	(15)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,251,705		2,217,806
Allowance for credit losses on loans	(36,206)	(37,155)	(35,077)	(33,723)	(33,042)	(30,962)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	947,278		956,440
Allowance for credit losses on loans	(15,382)	(15,873)	(15,081)	(14,503)	(20,208)	(14,014)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,020,466		949,502
Allowance for credit losses on loans	(15,735)	(15,973)	(14,418)	(14,239)	(14,075)	(13,132)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	268,075		271,054
Allowance for credit losses on loans	(4,016)	(4,031)	(4,288)	(4,210)	(3,691)	(3,273)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	865,756		883,438
Allowance for credit losses on loans	(14,366)	(14,604)	(14,009)	(13,535)	(13,134)	(11,268)
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	355,341		356,813
Allowance for credit losses on loans	(10,185)	(10,087)	(10,273)	(10,163)	(10,608)	(11,413)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	62,866		73,017
Allowance for credit losses on loans	$ (2,953)	$ (2,983)	$ (3,171)	$ (2,920)	$ (2,771)	$ (1,958)