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Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 7,006,824		$ 6,768,523
Total principal balance of loans owed, net of charge-offs	7,038,025		6,804,113
Unamortized net deferred loan fees	(15,120)		(15,283)
Discounts to principal balance of loans owed, net of charge-offs	(16,081)		(20,307)
Allowance for credit losses on loans	(124,571)	$ (124,455)	(125,366)	$ (123,760)	$ (123,517)	$ (121,522)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,793,394		4,577,632
Allowance for credit losses on loans	(75,017)	(74,484)	(72,849)	(71,339)	(73,032)	(68,864)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,293,909		1,281,059
Allowance for credit losses on loans	(25,748)	(25,318)	(27,463)	(27,504)	(27,674)	(27,453)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	453,221		471,271
Allowance for credit losses on loans	(9,089)	(10,024)	(14,397)	(14,453)	(12,128)	(12,750)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	298,774		279,933
Allowance for credit losses on loans	(10,792)	(10,995)	(7,224)	(7,119)	(7,466)	(8,856)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	162,338		151,822
Allowance for credit losses on loans	(3,901)	(3,609)	(3,403)	(3,312)	(3,180)	(3,589)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	5,188		6,806
Allowance for credit losses on loans	(24)	(25)	(30)	(33)	(37)	(10)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,449,676		2,323,036
Allowance for credit losses on loans	(41,179)	(40,921)	(37,229)	(36,206)	(37,155)	(35,077)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,037,517		961,415
Allowance for credit losses on loans	(11,930)	(11,578)	(15,747)	(15,382)	(15,873)	(15,081)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,048,144		1,028,035
Allowance for credit losses on loans	(15,706)	(15,097)	(15,913)	(15,735)	(15,973)	(14,418)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	258,057		265,146
Allowance for credit losses on loans	(6,202)	(6,888)	(3,960)	(4,016)	(4,031)	(4,288)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	848,696		859,660
Allowance for credit losses on loans	(11,022)	(11,135)	(14,227)	(14,366)	(14,604)	(14,009)
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	402,084		363,420
Allowance for credit losses on loans	(12,362)	(12,021)	(10,411)	(10,185)	(10,087)	(10,273)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	43,129		57,979
Allowance for credit losses on loans	$ (2,364)	$ (2,162)	$ (2,825)	$ (2,953)	$ (2,983)	$ (3,171)