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Allowance for Credit Losses on Loans - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 79,739 | $ 32,868 | $ 30,616 | $ 32,582 | $ 32,582
Charge-offs | (194) | (1,522) | (1,195) | (2,541) | (3,639)
Recoveries | 381 | 520 | 1,503 | 2,888 | 3,363
Provision (benefit) | 7,649 | (329) | 37,738 | (1,392) | (1,690)
Ending balance | 87,575 | 31,537 | 87,575 | 31,537 | 30,616
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 3,000 |  | 2,775 |  |
Charge-offs | 0 |  | 0 |  |
Recoveries | 0 |  | 0 |  |
Provision | 0 |  | 225 |  |
Ending balance | 3,000 |  | 3,000 |  | 2,775
Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 82,739 |  | 33,391 |  |
Charge-offs | (194) |  | (1,195) |  |
Recoveries | 381 |  | 1,503 |  |
Provision | 7,649 |  | 37,963 |  |
Ending balance | 90,575 |  | 90,575 |  | 33,391
Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 18,913 |  |
Ending balance |  |  |  |  | 18,913
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 0 |  |
Ending balance |  |  |  |  | 0
Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 18,913 |  |
Ending balance |  |  |  |  | 18,913
Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 44,850 | 12,099 | 11,995 | 12,944 | 12,944
Charge-offs | 0 | (746) | 0 | (746) | (746)
Recoveries | 24 | 126 | 226 | 1,518 | 1,528
Provision (benefit) | 5,420 | 462 | 26,225 | (1,775) | (1,731)
Ending balance | 50,294 | 11,941 | 50,294 | 11,941 | 11,995
Commercial real estate | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 11,848 |  |
Ending balance |  |  |  |  | 11,848
Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 23,165 | 11,128 | 10,084 | 11,051 | 11,051
Charge-offs | (100) | (192) | (507) | (553) | (770)
Recoveries | 213 | 310 | 932 | 1,035 | 1,310
Provision (benefit) | 729 | (290) | 5,214 | (577) | (1,507)
Ending balance | 24,007 | 10,956 | 24,007 | 10,956 | 10,084
Consumer | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 8,284 |  |
Ending balance |  |  |  |  | 8,284
Commercial and industrial |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 4,018 | 6,481 | 4,867 | 5,610 | 5,610
Charge-offs | (94) | (565) | (688) | (1,222) | (2,104)
Recoveries | 142 | 83 | 323 | 325 | 513
Provision (benefit) | 468 | (528) | 1,993 | 758 | 848
Ending balance | 4,534 | 5,471 | 4,534 | 5,471 | 4,867
Commercial and industrial | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (1,961) |  |
Ending balance |  |  |  |  | (1,961)
Construction |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 6,775 | 2,896 | 3,388 | 2,497 | 2,497
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision (benefit) | 865 | 57 | 3,319 | 456 | 891
Ending balance | 7,640 | 2,953 | 7,640 | 2,953 | 3,388
Construction | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 933 |  |
Ending balance |  |  |  |  | 933
Agriculture production |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 919 | 264 | 261 | 480 | 480
Charge-offs | 0 | (19) | 0 | (20) | (19)
Recoveries | 2 | 1 | 22 | 10 | 12
Provision (benefit) | 172 | (30) | 989 | (254) | (212)
Ending balance | 1,093 | 216 | 1,093 | 216 | 261
Agriculture production | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (179) |  |
Ending balance |  |  |  |  | (179)
Leases |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 12 | 0 | 21 | 0 | 0
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision (benefit) | (5) | 0 | (2) | 0 | 21
Ending balance | 7 | 0 | 7 | 0 | 21
Leases | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (12) |  |
Ending balance |  |  |  |  | (12)
CRE non-owner occupied | Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 26,091 | 6,182 | 5,948 | 7,401 | 7,401
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 23 | 8 | 223 | 1,397 | 1,486
Provision (benefit) | 2,733 | 261 | 15,975 | (2,347) | (2,939)
Ending balance | 28,847 | 6,451 | 28,847 | 6,451 | 5,948
CRE non-owner occupied | Commercial real estate | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 6,701 |  |
Ending balance |  |  |  |  | 6,701
CRE owner occupied | Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 8,710 | 2,214 | 2,027 | 2,711 | 2,711
Charge-offs | 0 | (746) | 0 | (746) | (746)
Recoveries | 1 | 118 | 3 | 121 | 42
Provision (benefit) | 914 | 93 | 5,314 | (407) | 20
Ending balance | 9,625 | 1,679 | 9,625 | 1,679 | 2,027
CRE owner occupied | Commercial real estate | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,281 |  |
Ending balance |  |  |  |  | 2,281
Multifamily | Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 8,581 | 3,082 | 3,352 | 2,429 | 2,429
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision (benefit) | 1,451 | 69 | 4,399 | 722 | 923
Ending balance | 10,032 | 3,151 | 10,032 | 3,151 | 3,352
Multifamily | Commercial real estate | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,281 |  |
Ending balance |  |  |  |  | 2,281
Farmland | Commercial real estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 1,468 | 621 | 668 | 403 | 403
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provision (benefit) | 322 | 39 | 537 | 257 | 265
Ending balance | 1,790 | 660 | 1,790 | 660 | 668
Farmland | Commercial real estate | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 585 |  |
Ending balance |  |  |  |  | 585
SFR 1-4 1st DT Liens | Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 8,015 | 2,576 | 2,306 | 2,676 | 2,676
Charge-offs | (2) | 0 | (13) | (2) | (2)
Recoveries | 2 | 47 | 414 | 53 | 54
Provision (benefit) | 922 | (217) | 3,555 | (321) | (422)
Ending balance | 8,937 | 2,406 | 8,937 | 2,406 | 2,306
SFR 1-4 1st DT Liens | Consumer | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,675 |  |
Ending balance |  |  |  |  | 2,675
SFR HELOCs and junior liens | Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 12,108 | 7,101 | 6,183 | 7,582 | 7,582
Charge-offs | 0 | (3) | (23) | (3) | (3)
Recoveries | 126 | 183 | 265 | 719 | 935
Provision (benefit) | (558) | (286) | 613 | (1,303) | (2,331)
Ending balance | 11,676 | 6,995 | 11,676 | 6,995 | 6,183
SFR HELOCs and junior liens | Consumer | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 4,638 |  |
Ending balance |  |  |  |  | 4,638
Other | Consumer |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 3,042 | 1,451 | 1,595 | 793 | 793
Charge-offs | (98) | (189) | (471) | (548) | (765)
Recoveries | 85 | 80 | 253 | 263 | 321
Provision (benefit) | 365 | 213 | 1,046 | 1,047 | 1,246
Ending balance | $ 3,394 | $ 1,555 | 3,394 | $ 1,555 | 1,595
Other | Consumer | Impact of CECL Adoption |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 971 |  |
Ending balance |  |  |  |  | $ 971

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