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Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans	$ 7,006,824	$ 6,768,523
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,793,394	4,577,632
Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,293,909	1,281,059
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	453,221	471,271
Construction
Financing Receivable, Past Due [Line Items]
Loans	298,774	279,933
Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	162,338	151,822
Leases
Financing Receivable, Past Due [Line Items]
Loans	5,188	6,806
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,449,676	2,323,036
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,037,517	961,415
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,048,144	1,028,035
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	258,057	265,146
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	848,696	859,660
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	402,084	363,420
Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	43,129	57,979
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	7,006,824	6,768,523
Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,793,394	4,577,632
Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,293,909	1,281,059
Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	453,221	471,271
Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	298,774	279,933
Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	162,338	151,822
Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	5,188	6,806
Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,449,676	2,323,036
Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,037,517	961,415
Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,048,144	1,028,035
Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	258,057	265,146
Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	848,696	859,660
Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	402,084	363,420
Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	43,129	57,979
Total Past Due Loans | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	45,712	32,711
Total Past Due Loans | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	29,065	18,066
Total Past Due Loans | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	11,129	3,875
Total Past Due Loans | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	3,010	10,102
Total Past Due Loans | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	1,863	0
Total Past Due Loans | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	645	668
Total Past Due Loans | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total Past Due Loans | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,729	2,673
Total Past Due Loans | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	3,651	5,329
Total Past Due Loans | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	168	1,120
Total Past Due Loans | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	20,517	8,944
Total Past Due Loans | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	3,127	1,562
Total Past Due Loans | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	7,434	2,131
Total Past Due Loans | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	568	182
30-59 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	7,454	6,477
30-59 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,525	5,652
30-59 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	4,998	251
30-59 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	829	537
30-59 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	0	0
30-59 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	102	37
30-59 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	0	0
30-59 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	221
30-59 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,522	1,625
30-59 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	3	1,120
30-59 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	2,686
30-59 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	126	0
30-59 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	4,758	201
30-59 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	114	50
60-89 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	10,156	1,681
60-89 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	6,104	198
60-89 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	3,040	858
60-89 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	786	308
60-89 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	0	0
60-89 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	226	317
60-89 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	0	0
60-89 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
60-89 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	242	85
60-89 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	165	0
60-89 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	5,697	113
60-89 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	2,472	6
60-89 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	395	852
60-89 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	173	0
> 90 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	28,102	24,553
> 90 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	21,436	12,216
> 90 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	3,091	2,766
> 90 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	1,395	9,257
> 90 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	1,863	0
> 90 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	317	314
> 90 days | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	0	0
> 90 days | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,729	2,452
> 90 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,887	3,619
> 90 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
> 90 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	14,820	6,145
> 90 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	529	1,556
> 90 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	2,281	1,078
> 90 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	281	132
Current | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	6,961,112	6,735,812
Current | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,764,329	4,559,566
Current | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,282,780	1,277,184
Current | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	450,211	461,169
Current | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	296,911	279,933
Current | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	161,693	151,154
Current | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	5,188	6,806
Current | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,444,947	2,320,363
Current | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,033,866	956,086
Current | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,047,976	1,026,915
Current | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	237,540	256,202
Current | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	845,569	858,098
Current | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	394,650	361,289
Current | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	$ 42,561	$ 57,797

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