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Allowance for Credit Losses - Reserve for Unfunded Commitments (Details) - Reserve for unfunded commitments - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | $ 29,222 | $ 23,204 | $ 30,603 | $ 600
Increase (decrease) in Provision | 3,300 | 1,400 | 1,919 | 7,704
Reserve for unfunded commitments, ending balance | 32,522 | 24,604 | 32,522 | 24,604
Commercial and Industrial |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | 12,808 | 8,181 | 11,719 |
Increase (decrease) in Provision | 446 | 1,212 | 1,535 | 4,003
Reserve for unfunded commitments, ending balance | 13,254 | 9,393 | 13,254 | 9,393
Commercial real estate |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | 978 | 1,168 | 1,328 |
Increase (decrease) in Provision | 255 | (57) | (95) | 333
Reserve for unfunded commitments, ending balance | 1,233 | 1,111 | 1,233 | 1,111
Construction |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | 7,873 | 5,908 | 9,037 |
Increase (decrease) in Provision | 902 | (749) | (262) | 1,040
Reserve for unfunded commitments, ending balance | 8,775 | 5,159 | 8,775 | 5,159
Residential mortgage |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  | 3 | 2 |
Increase (decrease) in Provision |  | 1 | (2) | (3)
Reserve for unfunded commitments, ending balance |  | 4 |  | 4
Home equity |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | 7,521 | 7,890 | 8,452 |
Increase (decrease) in Provision | 1,669 | 996 | 738 | 2,299
Reserve for unfunded commitments, ending balance | 9,190 | 8,886 | 9,190 | 8,886
Consumer |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance | 42 | 54 | 65 | 600
Increase (decrease) in Provision | 28 | (3) | 5 | 32
Reserve for unfunded commitments, ending balance | $ 70 | $ 51 | $ 70 | 51
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 16,300
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Commercial and Industrial |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 5,390
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Commercial real estate |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 778
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Construction |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 4,119
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Residential mortgage |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 7
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Home equity |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | 6,587
ASU No. 2016-13 | Cumulative-effect adjustment of a change in accounting principle, net of tax: ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments | Consumer |  |  |  |
Reserve for unfunded commitments: |  |  |  |
Reserve for unfunded commitments, beginning balance |  |  |  | $ (581)

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