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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | $ 51,300 | $ 31,132 | $ 31,936 | $ 25,201 |  |  |
Provisions | 15,740 | 5,931 | 45,713 | 16,321 |  |  |
Charge-offs | (6,145) | (5,686) | (17,615) | (11,314) |  |  |
Recoveries | 363 | 208 | 1,224 | 1,377 |  |  |
Ending balance | 61,258 | 31,585 | 61,258 | 31,585 |  |  |
Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | $ 14,782 |  | $ 9,562
Collectively evaluated for impairment |  |  |  |  | 41,445 |  | 19,221
Allowance for loan and lease losses | 51,300 | 31,585 | 31,936 | 25,201 | 61,258 | $ 31,936 | 31,585
Loans and leases ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 77,890 |  | 53,176
Collectively evaluated for impairment |  |  |  |  | 4,079,809 |  | 3,502,892
Total loans and leases |  |  |  |  | 4,374,517 | 3,785,661 | 3,831,090
Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 5,031 |  | 2,802
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 216,818 |  | 275,022
Commercial Real Estate |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 14,110 | 8,934 | 7,965 | 7,540 |  |  |
Provisions | 6,421 | 1,075 | 14,149 | 4,212 |  |  |
Charge-offs | (1,566) | (1,459) | (3,206) | (3,628) |  |  |
Recoveries | 19 | 3 | 76 | 429 |  |  |
Ending balance | 18,984 | 8,553 | 18,984 | 8,553 |  |  |
Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 4,516 |  | 2,728
Collectively evaluated for impairment |  |  |  |  | 11,825 |  | 4,458
Allowance for loan and lease losses | 18,984 | 8,553 | 7,965 | 7,540 | 18,984 | 7,965 | 8,553
Loans and leases ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 39,001 |  | 24,071
Collectively evaluated for impairment |  |  |  |  | 1,191,740 |  | 1,139,782
Total loans and leases |  |  |  |  | 1,347,855 | 1,276,542 | 1,306,288
Commercial Real Estate | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 2,643 |  | 1,367
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 117,114 |  | 142,435
Residential Real Estate |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 3,741 | 2,171 | 1,990 | 1,751 |  |  |
Provisions | 291 | 74 | 2,031 | 230 |  |  |
Charge-offs | (250) |  | (259) | (9) |  |  |
Recoveries | 8 | 6 | 28 | 279 |  |  |
Ending balance | 3,790 | 2,251 | 3,790 | 2,251 |  |  |
Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 77 |  | 39
Collectively evaluated for impairment |  |  |  |  | 3,413 |  | 1,612
Allowance for loan and lease losses | 3,790 | 2,251 | 1,990 | 1,751 | 3,790 | 1,990 | 2,251
Loans and leases ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 1,636 |  | 2,374
Collectively evaluated for impairment |  |  |  |  | 547,563 |  | 637,320
Total loans and leases |  |  |  |  | 633,396 | 711,822 | 749,103
Residential Real Estate | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 300 |  | 600
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 84,197 |  | 109,409
Construction, Land Development, and Other Land |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 1,491 | 691 | 610 | 466 |  |  |
Provisions | 1,029 | 125 | 1,910 | 350 |  |  |
Charge-offs | (701) |  | (701) |  |  |  |
Recoveries | 53 |  | 53 |  |  |  |
Ending balance | 1,872 | 816 | 1,872 | 816 |  |  |
Ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 1,685 |  | 802
Allowance for loan and lease losses | 1,872 | 816 | 610 | 466 | 1,872 | 610 | 816
Loans and leases ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 234,230 |  | 276,437
Total loans and leases |  |  |  |  | 239,034 | 278,657 | 280,999
Construction, Land Development, and Other Land | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 187 |  | 14
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 4,804 |  | 4,562
Commercial and Industrial |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 30,108 | 17,126 | 19,377 | 12,932 |  |  |
Provisions | 7,603 | 4,198 | 26,844 | 10,550 |  |  |
Charge-offs | (3,254) | (3,561) | (12,057) | (5,740) |  |  |
Recoveries | 83 | 20 | 376 | 41 |  |  |
Ending balance | 34,540 | 17,783 | 34,540 | 17,783 |  |  |
Ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 10,189 |  | 6,795
Collectively evaluated for impairment |  |  |  |  | 22,450 |  | 10,169
Allowance for loan and lease losses | 34,540 | 17,783 | 19,377 | 12,932 | 34,540 | 19,377 | 17,783
Loans and leases ending balance: |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  | 37,253 |  | 26,731
Collectively evaluated for impairment |  |  |  |  | 1,281,067 |  | 1,257,082
Total loans and leases |  |  |  |  | 1,328,809 | 1,331,565 | 1,302,162
Commercial and Industrial | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 1,901 |  | 819
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 10,489 |  | 18,349
Paycheck Protection Program ("PPP") |  |  |  |  |  |  |
Loans and leases ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 622,191 |  |
Total loans and leases |  |  |  |  | 622,191 |  |
Installment and Other |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 36 | 67 | 50 | 49 |  |  |
Provisions | 1 | (12) | (13) | 10 |  |  |
Charge-offs |  | (1) |  | (5) |  |  |
Recoveries |  | 1 |  | 1 |  |  |
Ending balance | 37 | 55 | 37 | 55 |  |  |
Ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 37 |  | 53
Allowance for loan and lease losses | 37 | 55 | 50 | 49 | 37 | 50 | 55
Loans and leases ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 2,929 |  | 9,087
Total loans and leases |  |  |  |  | 3,143 | 6,565 | 9,354
Installment and Other | Loans Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |
Ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  | 2
Loans and leases ending balance: |  |  |  |  |  |  |
Loans acquired with deteriorated credit quality |  |  |  |  | 214 |  | 267
Lease Financing Receivables |  |  |  |  |  |  |
Allowance for loan and lease losses |  |  |  |  |  |  |
Beginning balance | 1,814 | 2,143 | 1,944 | 2,463 |  |  |
Provisions | 395 | 471 | 792 | 969 |  |  |
Charge-offs | (374) | (665) | (1,392) | (1,932) |  |  |
Recoveries | 200 | 178 | 691 | 627 |  |  |
Ending balance | 2,035 | 2,127 | 2,035 | 2,127 |  |  |
Ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 2,035 |  | 2,127
Allowance for loan and lease losses | $ 2,035 | $ 2,127 | $ 1,944 | $ 2,463 | 2,035 | 1,944 | 2,127
Loans and leases ending balance: |  |  |  |  |  |  |
Collectively evaluated for impairment |  |  |  |  | 200,089 |  | 183,184
Total loans and leases |  |  |  |  | $ 200,089 | $ 180,510 | $ 183,184

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