Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans	$ 6,422,421	$ 6,450,447
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,353,959	4,359,083
Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,233,797	1,240,743
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	553,098	569,921
Construction
Financing Receivable, Past Due [Line Items]
Loans	225,996	211,560
Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	47,062	61,414
Leases
Financing Receivable, Past Due [Line Items]
Loans	8,509	7,726
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,161,059	2,149,725
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	971,210	984,807
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	946,693	944,537
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	274,997	280,014
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	803,407	790,349
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	375,591	393,666
Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	54,799	56,728
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	6,422,421	6,450,447
Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,353,959	4,359,083
Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,233,797	1,240,743
Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	553,098	569,921
Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	225,996	211,560
Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	47,062	61,414
Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	8,509	7,726
Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,161,059	2,149,725
Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	971,210	984,807
Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	946,693	944,537
Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	274,997	280,014
Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	803,407	790,349
Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	375,591	393,666
Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	54,799	56,728
Total Past Due Loans | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	7,891	4,947
Total Past Due Loans | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,183	332
Total Past Due Loans | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	3,796	1,463
Total Past Due Loans | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	2,455	2,773
Total Past Due Loans | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	457	379
Total Past Due Loans | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	0	0
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	623	0
Total Past Due Loans | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	410	173
Total Past Due Loans | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	159
Total Past Due Loans | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	150	0
Total Past Due Loans | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,355	303
Total Past Due Loans | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	2,135	1,045
Total Past Due Loans | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	306	115
30-59 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	1,891	2,681
30-59 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	929	159
30-59 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	491	222
30-59 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	471	2,300
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	0	0
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	623	0
30-59 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	156	0
30-59 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	159
30-59 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	150	0
30-59 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	442	24
30-59 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	0	172
30-59 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	49	26
60-89 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	3,815	488
60-89 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	82	98
60-89 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	2,035	200
60-89 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	1,620	190
60-89 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	78	0
60-89 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	0	0
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	82	98
60-89 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
60-89 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
60-89 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	557	0
60-89 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,342	166
60-89 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	136	34
> 90 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	2,185	1,778
> 90 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	172	75
> 90 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,270	1,041
> 90 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	364	283
> 90 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	379	379
> 90 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	0	0
> 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	0	0
> 90 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	172	75
> 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	0	0
> 90 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	356	279
> 90 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	793	707
> 90 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	121	55
Current | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	6,414,530	6,445,500
Current | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	4,352,776	4,358,751
Current | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,230,001	1,239,280
Current | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	550,643	567,148
Current | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	225,539	211,181
Current | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	47,062	61,414
Current | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	8,509	7,726
Current | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,160,436	2,149,725
Current | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	970,800	984,634
Current | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	946,693	944,378
Current | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	274,847	280,014
Current | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	802,052	790,046
Current | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	373,456	392,621
Current | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	$ 54,493	$ 56,613