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Allowance for Loan and Lease Losses and Reserve for Unfunded Commitments - Summary of Allowance for Loan and Lease Losses and Corresponding Loan and Lease Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for loan and lease losses                      
Beginning balance       $ 25,201       $ 16,706 $ 25,201 $ 16,706 $ 10,923
Provision (release) $ 4,387 $ 5,931 $ 6,391 3,999 $ 3,882 $ 5,842 $ 3,956 5,115 20,708 18,795 12,653
Charge-offs                 (15,859) (11,804) (8,196)
Recoveries                 1,886 1,504 1,326
Ending balance 31,936       25,201       31,936 25,201 16,706
Ending balance:                      
Individually evaluated for impairment 10,690       6,649       10,690 6,649 3,965
Collectively evaluated for impairment 18,470       15,817       18,470 15,817 8,867
Ending balance 31,936       25,201       31,936 25,201 16,706
Loans and leases ending balance:                      
Individually evaluated for impairment 68,741       35,914       68,741 35,914 31,111
Collectively evaluated for impairment 3,458,252       3,188,170       3,458,252 3,188,170 1,918,691
Total loans and leases 3,785,661       3,501,626       3,785,661 3,501,626 2,277,492
Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality 2,776       2,735       2,776 2,735 3,874
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 258,668       277,542       258,668 277,542 327,690
Commercial Real Estate                      
Allowance for loan and lease losses                      
Beginning balance       7,540       4,794 7,540 4,794 1,945
Provision (release)                 4,805 4,543 4,343
Charge-offs                 (4,950) (1,865) (1,494)
Recoveries                 570 68  
Ending balance 7,965       7,540       7,965 7,540 4,794
Ending balance:                      
Individually evaluated for impairment 2,614       2,191       2,614 2,191 1,101
Collectively evaluated for impairment 4,414       4,105       4,414 4,105 1,765
Ending balance 7,965       7,540       7,965 7,540 4,794
Loans and leases ending balance:                      
Individually evaluated for impairment 26,396       11,983       26,396 11,983 13,884
Collectively evaluated for impairment 1,114,232       1,102,816       1,114,232 1,102,816 711,097
Total loans and leases 1,276,542       1,261,607       1,276,542 1,261,607 891,693
Commercial Real Estate | Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality 937       1,244       937 1,244 1,928
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 135,914       146,808       135,914 146,808 166,712
Residential Real Estate                      
Allowance for loan and lease losses                      
Beginning balance       1,751       1,638 1,751 1,638 2,483
Provision (release)                 67 113 (405)
Charge-offs                 (113)   (440)
Recoveries                 285    
Ending balance 1,990       1,751       1,990 1,751 1,638
Ending balance:                      
Individually evaluated for impairment 124       61       124 61 158
Collectively evaluated for impairment 1,191       1,323       1,191 1,323 1,047
Ending balance 1,990       1,751       1,990 1,751 1,638
Loans and leases ending balance:                      
Individually evaluated for impairment 2,398       2,137       2,398 2,137 2,429
Collectively evaluated for impairment 609,201       588,831       609,201 588,831 430,227
Total loans and leases 711,822       704,902       711,822 704,902 577,218
Residential Real Estate | Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality 675       367       675 367 433
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 100,223       113,934       100,223 113,934 144,562
Construction, Land Development, and Other Land                      
Allowance for loan and lease losses                      
Beginning balance       466       222 466 222 742
Provision (release)                 144 662 (520)
Charge-offs                   (418)  
Ending balance 610       466       610 466 222
Ending balance:                      
Collectively evaluated for impairment 584       466       584 466 145
Ending balance 610       466       610 466 222
Loans and leases ending balance:                      
Individually evaluated for impairment 2,644               2,644    
Collectively evaluated for impairment 270,640       181,570       270,640 181,570 99,483
Total loans and leases 278,657       185,349       278,657 185,349 105,429
Construction, Land Development, and Other Land | Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality 26               26   77
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 5,373       3,779       5,373 3,779 5,946
Commercial and Industrial                      
Allowance for loan and lease losses                      
Beginning balance       12,932       7,418 12,932 7,418 4,196
Provision (release)                 14,460 12,089 6,058
Charge-offs                 (8,171) (6,944) (2,836)
Recoveries                 156 369  
Ending balance 19,377       12,932       19,377 12,932 7,418
Ending balance:                      
Individually evaluated for impairment 7,952       4,397       7,952 4,397 2,692
Collectively evaluated for impairment 10,287       7,413       10,287 7,413 3,308
Ending balance 19,377       12,932       19,377 12,932 7,418
Loans and leases ending balance:                      
Individually evaluated for impairment 37,303       21,794       37,303 21,794 14,784
Collectively evaluated for impairment 1,277,353       1,110,386       1,277,353 1,110,386 496,446
Total loans and leases 1,331,565       1,144,797       1,331,565 1,144,797 521,238
Commercial and Industrial | Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality 1,138       1,122       1,138 1,122 1,418
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 16,909       12,617       16,909 12,617 10,008
Installment and Other                      
Allowance for loan and lease losses                      
Beginning balance       49       41 49 41 334
Provision (release)                 15 68 34
Charge-offs                 (16) (60) (327)
Recoveries                 2    
Ending balance 50       49       50 49 41
Ending balance:                      
Individually evaluated for impairment                     14
Collectively evaluated for impairment 50       47       50 47 9
Ending balance 50       49       50 49 41
Loans and leases ending balance:                      
Individually evaluated for impairment                     14
Collectively evaluated for impairment 6,316       13,314       6,316 13,314 3,752
Total loans and leases 6,565       13,718       6,565 13,718 4,228
Installment and Other | Loans Acquired with Deteriorated Credit Quality                      
Ending balance:                      
Loans acquired with deteriorated credit quality         2         2 18
Loans and leases ending balance:                      
Loans acquired with deteriorated credit quality 249       404       249 404 462
Lease Financing Receivables                      
Allowance for loan and lease losses                      
Beginning balance       $ 2,463       $ 2,593 2,463 2,593 1,223
Provision (release)                 1,217 1,320 3,143
Charge-offs                 (2,609) (2,517) (3,099)
Recoveries                 873 1,067 1,326
Ending balance 1,944       2,463       1,944 2,463 2,593
Ending balance:                      
Collectively evaluated for impairment 1,944       2,463       1,944 2,463 2,593
Ending balance 1,944       2,463       1,944 2,463 2,593
Loans and leases ending balance:                      
Collectively evaluated for impairment 180,510       191,253       180,510 191,253 177,686
Total loans and leases $ 180,510       $ 191,253       $ 180,510 $ 191,253 $ 177,686