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Allowance for Credit Losses on Loans - Analysis of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total | $ 4,801,405 | $ 4,307,366
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,905,485 | 2,818,782
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 945,669 | 955,050
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 634,481 | 249,791
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 278,566 | 249,827
Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 35,441 | 32,633
Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,763 | 1,283
CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,596,941 | 1,609,556
CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 579,803 | 546,434
Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 577,217 | 517,725
Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 151,524 | 145,067
SFR 1-4 1st DT Liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 506,069 | 509,508
SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 358,087 | 362,886
Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 81,513 | 82,656
Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 16,622 | 10,720
Current | 4,784,783 | 4,296,646
Total | 4,801,405 | 4,307,366
Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 8,102 | 3,148
Current | 2,897,383 | 2,815,634
Total | 2,905,485 | 2,818,782
Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 6,537 | 6,599
Current | 939,132 | 948,451
Total | 945,669 | 955,050
Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,699 | 924
Current | 632,782 | 248,867
Total | 634,481 | 249,791
Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 19 | 0
Current | 278,547 | 249,827
Total | 278,566 | 249,827
Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 265 | 49
Current | 35,176 | 32,584
Total | 35,441 | 32,633
Financial Asset Originated | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 0 | 0
Current | 1,763 | 1,283
Total | 1,763 | 1,283
Financial Asset Originated | CRE non-owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,369 | 518
Current | 1,593,572 | 1,609,038
Total | 1,596,941 | 1,609,556
Financial Asset Originated | CRE owner occupied | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,529 | 293
Current | 577,274 | 546,141
Total | 579,803 | 546,434
Financial Asset Originated | Multifamily | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,024 | 2,307
Current | 575,193 | 515,418
Total | 577,217 | 517,725
Financial Asset Originated | Farmland | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 180 | 30
Current | 151,344 | 145,037
Total | 151,524 | 145,067
Financial Asset Originated | SFR 1-4 1st DT Liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,316 | 3,477
Current | 502,753 | 506,031
Total | 506,069 | 509,508
Financial Asset Originated | SFR HELOCs and junior liens | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 2,827 | 2,926
Current | 355,260 | 359,960
Total | 358,087 | 362,886
Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 394 | 196
Current | 81,119 | 82,460
Total | 81,513 | 82,656
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,818 | 3,812
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 3,723 | 581
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 210 | 2,579
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 751 | 603
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 19 | 0
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Agriculture production |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 115 | 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 | 2,589 | 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 | 954 | 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 | 180 | 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 | 0 | 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 | 125 | 1,258
Financial Asset, 30 to 59 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 85 | 172
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 4,350 | 1,385
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,855 | 136
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 1,728 | 952
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 767 | 297
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 | 667 | 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 | 1,188 |
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 | 1,046 | 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 | 453 | 580
Financial Asset, 60 to 89 Days Past Due | Financial Asset Originated | Other | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 229 | 1
Financial Asset, Equal to or Greater than 90 Days Past Due | Financial Asset Originated |  |
Financing Receivable, Past Due [Line Items] |  |
Past due | 7,454 | 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 | 2,524 | 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 | 4,599 | 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 | 181 | 24
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 | 150 | 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 | 113 | 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 | 387 | 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 | 2,024 | 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 | 0 | 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 | 2,270 | 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 | 2,249 | 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 | $ 80 | $ 23

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