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Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 86,062 $ 79,739 $ 91,847 $ 30,616 $ 30,616
Charge-offs (1,582)   (2,195) (1,195) (1,755)
Recoveries 1,321 381 2,534 1,503 1,885
Provision (benefit) (1,495) 7,649 (7,880) 37,738 42,188
Ending balance 84,306 87,575 84,306 87,575 91,847
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 3,465 3,000 3,400 2,775 2,775
Charge-offs 0   0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 60 0 125 225 625
Ending balance 3,525 3,000 3,525 3,000 3,400
Credit Loss [Roll Forward]          
Beginning balance 89,527 82,739 95,247 33,391 33,391
Charge-offs (1,582)   (2,195) (1,195) (1,755)
Recoveries 1,321 381 2,534 1,503 1,885
Provision (benefit) (1,435) 7,649 (7,755) 37,963 42,813
Ending balance 87,831 90,575 87,831 90,575 95,247
Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       18,913 18,913
Charge-offs   (194)      
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance       0 0
Charge-offs   0      
Credit Loss [Roll Forward]          
Beginning balance       18,913 18,913
Charge-offs   (194)      
Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 51,637 44,850 53,693 11,995 11,995
Charge-offs (144) 0 (144) 0 (182)
Recoveries 803 24 806 226 226
Provision (benefit) (1,567) 5,420 (3,626) 26,225 29,806
Ending balance 50,729 50,294 50,729 50,294 53,693
Commercial real estate | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       11,848 11,848
Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 23,950 23,165 25,148 10,084 10,084
Charge-offs (326) (100) (605) (507) (799)
Recoveries 161 213 1,134 932 1,067
Provision (benefit) (294) 729 (2,186) 5,214 6,512
Ending balance 23,491 24,007 23,491 24,007 25,148
Consumer | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       8,284 8,284
Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,511 4,018 4,252 4,867 4,867
Charge-offs (1,112) (94) (1,446) (688) (774)
Recoveries 355 142 570 323 568
Provision (benefit) (327) 468 51 1,993 1,552
Ending balance 3,427 4,534 3,427 4,534 4,252
Commercial and industrial | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       (1,961) (1,961)
Construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 4,951 6,775 7,540 3,388 3,388
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 577 865 (2,012) 3,319 3,219
Ending balance 5,528 7,640 5,528 7,640 7,540
Construction | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       933 933
Agriculture production          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,007 919 1,209 261 261
Charge-offs 0 0 0 0 0
Recoveries 2 2 24 22 24
Provision (benefit) 110 172 (114) 989 1,103
Ending balance 1,119 1,093 1,119 1,093 1,209
Agriculture production | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       (179) (179)
Leases          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 6 12 5 21 21
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 6 (5) 7 (2) (4)
Ending balance 12 7 12 7 5
Leases | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       (12) (12)
CRE non-owner occupied | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 26,028 26,091 29,380 5,948 5,948
Charge-offs 0 0 0 0 0
Recoveries 10 23 12 223 198
Provision (benefit) (817) 2,733 (4,171) 15,975 16,533
Ending balance 25,221 28,847 25,221 28,847 29,380
CRE non-owner occupied | Commercial real estate | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       6,701 6,701
CRE owner occupied | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,463 8,710 10,861 2,027 2,027
Charge-offs (18) 0 (18) 0 0
Recoveries 793 1 794 3 28
Provision (benefit) (508) 914 (907) 5,314 6,525
Ending balance 10,730 9,625 10,730 9,625 10,861
CRE owner occupied | Commercial real estate | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       2,281 2,281
Multifamily | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 13,196 8,581 11,472 3,352 3,352
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) (320) 1,451 1,404 4,399 5,839
Ending balance 12,876 10,032 12,876 10,032 11,472
Multifamily | Commercial real estate | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       2,281 2,281
Farmland | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,950 1,468 1,980 668 668
Charge-offs (126) 0 (126) 0 (182)
Recoveries 0 0 0 0 0
Provision (benefit) 78 322 48 537 909
Ending balance 1,902 1,790 1,902 1,790 1,980
Farmland | Commercial real estate | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       585 585
SFR 1-4 1st DT liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,629 8,015 10,117 2,306 2,306
Charge-offs (145) (2) (145) (13) (13)
Recoveries 1 2 12 414 416
Provision (benefit) 133 922 634 3,555 4,733
Ending balance 10,618 8,937 10,618 8,937 10,117
SFR 1-4 1st DT liens | Consumer | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       2,675 2,675
SFR HELOCs and junior liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,701 12,108 11,771 6,183 6,183
Charge-offs 0 0 0 (23) (116)
Recoveries 63 126 860 265 304
Provision (benefit) (333) (558) (2,200) 613 762
Ending balance 10,431 11,676 10,431 11,676 11,771
SFR HELOCs and junior liens | Consumer | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       4,638 4,638
Other | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,620 3,042 3,260 1,595 1,595
Charge-offs (181) (98) (460) (471) (670)
Recoveries 97 85 262 253 347
Provision (benefit) (94) 365 (620) 1,046 1,017
Ending balance $ 2,442 $ 3,394 $ 2,442 3,394 3,260
Other | Consumer | Impact of CECL Adoption          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       $ 971 $ 971