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Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Total	$ 6,958,993		$ 6,768,523
Total principal balance of loans owed, net of charge-offs	6,991,115		6,804,113
Unamortized net deferred loan fees	(15,054)		(15,283)
Discounts to principal balance of loans owed, net of charge-offs	(17,068)		(20,307)
Allowance for credit losses on loans	(124,455)	$ (128,423)	(125,366)	$ (123,517)	$ (124,394)	$ (121,522)
Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	4,730,732		4,577,632
Allowance for credit losses on loans	(74,484)	(72,180)	(72,849)	(73,032)	(72,175)	(68,864)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	1,288,691		1,281,059
Allowance for credit losses on loans	(25,318)	(25,540)	(27,463)	(27,674)	(27,441)	(27,453)
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total	467,564		471,271
Allowance for credit losses on loans	(10,024)	(17,561)	(14,397)	(12,128)	(11,867)	(12,750)
Construction
Loans and Leases Receivable Disclosure [Line Items]
Total	304,920		279,933
Allowance for credit losses on loans	(10,995)	(10,346)	(7,224)	(7,466)	(9,162)	(8,856)
Agriculture production
Loans and Leases Receivable Disclosure [Line Items]
Total	161,457		151,822
Allowance for credit losses on loans	(3,609)	(2,768)	(3,403)	(3,180)	(3,708)	(3,589)
Leases
Loans and Leases Receivable Disclosure [Line Items]
Total	5,629		6,806
Allowance for credit losses on loans	(25)	(28)	(30)	(37)	(41)	(10)
CRE non-owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	2,438,949		2,323,036
Allowance for credit losses on loans	(40,921)	(39,670)	(37,229)	(37,155)	(36,687)	(35,077)
CRE owner occupied \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	997,205		961,415
Allowance for credit losses on loans	(11,578)	(12,169)	(15,747)	(15,873)	(16,111)	(15,081)
Multifamily \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	1,030,052		1,028,035
Allowance for credit losses on loans	(15,097)	(15,604)	(15,913)	(15,973)	(15,682)	(14,418)
Farmland \| Commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total	264,526		265,146
Allowance for credit losses on loans	(6,888)	(4,737)	(3,960)	(4,031)	(3,695)	(4,288)
SFR 1-4 1st DT liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	850,208		859,660
Allowance for credit losses on loans	(11,135)	(10,995)	(14,227)	(14,604)	(14,140)	(14,009)
SFR HELOCs and junior liens \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	390,344		363,420
Allowance for credit losses on loans	(12,021)	(11,650)	(10,411)	(10,087)	(9,942)	(10,273)
Other \| Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total	48,139		57,979
Allowance for credit losses on loans	$ (2,162)	$ (2,895)	$ (2,825)	$ (2,983)	$ (3,359)	$ (3,171)