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Allowance for Credit Losses - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total | $ 4,966,977 | $ 4,763,127
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,108,624 | 2,951,902
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,041,213 | 952,108
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 551,077 | 526,327
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 221,613 | 284,842
Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 39,753 | 44,164
Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 4,697 | 3,784
CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,554,927 | 1,535,555
CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 641,216 | 624,375
Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 764,884 | 639,480
Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 147,597 | 152,492
SFR 1-4 1st DT liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 636,824 | 546,592
SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 331,333 | 327,484
Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 73,056 | 78,032
Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 10,550 | 6,767
Current | 4,956,427 | 4,756,360
Total | 4,966,977 | 4,763,127
Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 6,113 | 2,629
Current | 3,102,511 | 2,949,273
Total | 3,108,624 | 2,951,902
Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,012 | 3,452
Current | 1,038,201 | 948,656
Total | 1,041,213 | 952,108
Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,091 | 686
Current | 549,986 | 525,641
Total | 551,077 | 526,327
Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 295 | 0
Current | 221,318 | 284,842
Total | 221,613 | 284,842
Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 39 | 0
Current | 39,714 | 44,164
Total | 39,753 | 44,164
Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Current | 4,697 | 3,784
Total | 4,697 | 3,784
Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,519 | 539
Current | 1,550,408 | 1,535,016
Total | 1,554,927 | 1,535,555
Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 747 | 1,121
Current | 640,469 | 623,254
Total | 641,216 | 624,375
Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Current | 764,884 | 639,480
Total | 764,884 | 639,480
Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 847 | 969
Current | 146,750 | 151,523
Total | 147,597 | 152,492
Financial Asset Originated | SFR 1-4 1st DT liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 881 | 997
Current | 635,943 | 545,595
Total | 636,824 | 546,592
Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,021 | 2,301
Current | 329,312 | 325,183
Total | 331,333 | 327,484
Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 110 | 154
Current | 72,946 | 77,878
Total | 73,056 | 78,032
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 824 | 1,974
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 213 | 1,323
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 125 | 496
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 152 | 155
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 295 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 39 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 55 | 127
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 158 | 297
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 899
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 37
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 59 | 418
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 66 | 41
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,025 | 824
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 354 | 173
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 503 | 225
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 168 | 426
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 354 | 173
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 |
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 490 | 212
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 13 | 13
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 8,701 | 3,969
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 5,546 | 1,133
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,384 | 2,731
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 771 | 105
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,110 | 239
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 589 | 824
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 847 | 70
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | SFR 1-4 1st DT liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 881 | 960
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,472 | 1,671
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | $ 31 | $ 100

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