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Allowance for Credit Losses on Loans - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total | $ 4,826,338 | $ 4,307,366
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,936,422 | 2,818,782
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 926,835 | 955,050
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 633,897 | 249,791
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 284,933 | 249,827
Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 40,613 | 32,633
Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 3,638 | 1,283
CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,600,284 | 1,609,556
CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 581,090 | 546,434
Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 602,199 | 517,725
Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 152,849 | 145,067
SFR 1-4 1st DT Liens | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 511,759 |
SFR 1-4 1st DT Liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total |  | 509,508
SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 332,820 | 362,886
Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 82,256 | 82,656
Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 10,522 | 10,720
Current | 4,815,816 | 4,296,646
Total | 4,826,338 | 4,307,366
Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,051 | 3,148
Current | 2,933,371 | 2,815,634
Total | 2,936,422 | 2,818,782
Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 6,074 | 6,599
Current | 920,761 | 948,451
Total | 926,835 | 955,050
Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 865 | 924
Current | 633,032 | 248,867
Total | 633,897 | 249,791
Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 202 | 0
Current | 284,731 | 249,827
Total | 284,933 | 249,827
Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 330 | 49
Current | 40,283 | 32,584
Total | 40,613 | 32,633
Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Current | 3,638 | 1,283
Total | 3,638 | 1,283
Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,397 | 518
Current | 1,598,887 | 1,609,038
Total | 1,600,284 | 1,609,556
Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,203 | 293
Current | 579,887 | 546,141
Total | 581,090 | 546,434
Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 2,307
Current | 602,199 | 515,418
Total | 602,199 | 517,725
Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 451 | 30
Current | 152,398 | 145,037
Total | 152,849 | 145,067
Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,513 | 3,477
Current | 509,246 | 506,031
Total | 511,759 | 509,508
Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,137 | 2,926
Current | 329,683 | 359,960
Total | 332,820 | 362,886
Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 424 | 196
Current | 81,832 | 82,460
Total | 82,256 | 82,656
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,039 | 3,812
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,742 | 581
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,794 | 2,579
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 365 | 603
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 138 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 49
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 | 960 | 268
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 | 782 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 283
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 30
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 | 434 | 1,149
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 | 1,205 | 1,258
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 155 | 172
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,548 | 1,385
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 131 | 136
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 645 | 952
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 395 | 297
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 47 | 0
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 330 | 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 | 131 | 136
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 | 74 | 371
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 | 492 | 580
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 79 | 1
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,935 | 5,523
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 | 1,178 | 2,431
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,635 | 3,068
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 | 105 | 24
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 17 | 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 | 306 | 114
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 | 421 | 293
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 | 2,024
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 | 451 | 0
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 | 2,005 | 1,957
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 | 1,440 | 1,088
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | $ 190 | $ 23

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