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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

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