Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans	$ 5,851,975	$ 4,916,624
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	3,832,974	3,306,054
Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,136,712	1,071,551
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	500,882	259,355
Construction
Financing Receivable, Past Due [Line Items]
Loans	303,960	222,281
Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	69,339	50,811
Leases
Financing Receivable, Past Due [Line Items]
Loans	8,108	6,572
CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,891,022	1,603,141
CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	851,434	706,307
Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	839,918	823,500
Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	250,600	173,106
SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	711,389	666,960
SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	362,501	337,513
Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	62,822	67,078
Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	5,851,975	4,916,624
Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	3,832,974	3,306,054
Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,136,712	1,071,551
Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	500,882	259,355
Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	303,960	222,281
Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	69,339	50,811
Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	8,108	6,572
Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,891,022	1,603,141
Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	851,434	706,307
Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	839,918	823,500
Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	250,600	173,106
Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	711,389	666,960
Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	362,501	337,513
Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	62,822	67,078
Total Past Due Loans | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	8,402	4,332
Total Past Due Loans | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	2,343	1,509
Total Past Due Loans | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	2,319	2,128
Total Past Due Loans | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	716	557
Total Past Due Loans | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	2,852	90
Total Past Due Loans | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	172	48
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	1,681	263
Total Past Due Loans | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	273	671
Total Past Due Loans | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
Total Past Due Loans | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	389	575
Total Past Due Loans | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	610	375
Total Past Due Loans | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,370	1,609
Total Past Due Loans | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	339	144
30-59 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	4,291	836
30-59 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	506	497
30-59 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	686	145
30-59 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	75	146
30-59 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	2,852	0
30-59 days | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	172	48
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	269	226
30-59 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	271
30-59 days | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	0
30-59 days | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	237	0
30-59 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	219	0
30-59 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	175	36
30-59 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	292	109
60-89 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	1,687	880
60-89 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	998	164
60-89 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	483	381
60-89 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	206	245
60-89 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	0	90
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	998	37
60-89 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	0	127
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	67	13
60-89 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	409	361
60-89 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	7	7
> 90 days | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	2,424	2,616
> 90 days | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	839	848
> 90 days | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,150	1,602
> 90 days | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	435	166
> 90 days | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	0	0
> 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	414	0
> 90 days | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	273	273
> 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	152	575
> 90 days | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	324	362
> 90 days | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	786	1,212
> 90 days | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	40	28
Current | Financial Asset Originated
Financing Receivable, Past Due [Line Items]
Loans	5,843,573	4,912,292
Current | Financial Asset Originated | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	3,830,631	3,304,545
Current | Financial Asset Originated | Consumer
Financing Receivable, Past Due [Line Items]
Loans	1,134,393	1,069,423
Current | Financial Asset Originated | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans	500,166	258,798
Current | Financial Asset Originated | Construction
Financing Receivable, Past Due [Line Items]
Loans	301,108	222,191
Current | Financial Asset Originated | Agriculture production
Financing Receivable, Past Due [Line Items]
Loans	69,167	50,763
Current | Financial Asset Originated | Leases
Financing Receivable, Past Due [Line Items]
Loans	8,108	6,572
Current | Financial Asset Originated | CRE non-owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	1,889,341	1,602,878
Current | Financial Asset Originated | CRE owner occupied | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	851,161	705,636
Current | Financial Asset Originated | Multifamily | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	839,918	823,500
Current | Financial Asset Originated | Farmland | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	250,211	172,531
Current | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	710,779	666,585
Current | Financial Asset Originated | SFR HELOCs and junior liens | Consumer
Financing Receivable, Past Due [Line Items]
Loans	361,131	335,904
Current | Financial Asset Originated | Other | Consumer
Financing Receivable, Past Due [Line Items]
Loans	$ 62,483	$ 66,934