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Summary of Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | $ 7,760,212 |  | $ 7,545,748 |
Less: allowance for credit losses | (109,579) | $ (73,658) | (73,658) | $ (69,944)
Liabilities: Reserve for Unfunded Commitments | (5,498) | 0 | 0 |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Less: allowance for credit losses |  | (84,272) |  |
Liabilities: Reserve for Unfunded Commitments |  | (4,118) |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Less: allowance for credit losses |  | (10,614) | (10,614) |
Liabilities: Reserve for Unfunded Commitments |  | (4,118) |  |
Commercial |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 1,437,433 | 1,545,906 | 1,545,906 |
Less: allowance for credit losses | (26,569) |  | (18,832) | (15,857)
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 1,545,906 |  |
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | (892) |
Income producing - commercial real estate |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 3,687,000 | 3,702,747 | 3,702,747 |
Less: allowance for credit losses | (55,385) |  | (29,265) | (28,034)
Income producing - commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 3,702,747 |  |
Income producing - commercial real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | (11,230) |
Owner occupied - commercial real estate |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 997,694 | 985,409 | 985,409 |
Less: allowance for credit losses | (14,000) |  | (5,838) | (6,242)
Owner occupied - commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 985,409 |  |
Owner occupied - commercial real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | (4,674) |
Real estate mortgage - residential |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 76,592 | 104,221 | 104,221 |
Less: allowance for credit losses | (1,020) |  | (1,557) | (965)
Real estate mortgage - residential | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 104,221 |  |
Real estate mortgage - residential | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | 301 |
Construction - commercial and residential |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 873,261 | 1,035,754 | 1,125,244 |
Less: allowance for credit losses | (11,529) |  | (17,485) | (18,175)
Construction - commercial and residential | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 1,035,754 |  |
Construction - commercial and residential | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | 6,143 |
Construction - C&I (owner occupied) |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 158,905 | 89,490 |  |
Construction - C&I (owner occupied) | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 89,490 |  |
Construction - C&I (owner occupied) | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Home equity |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 73,167 | 80,061 | 80,061 |
Less: allowance for credit losses | (1,039) |  | (656) | (599)
Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 80,061 |  |
Home equity | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 0 |  |
Less: allowance for credit losses |  |  | (245) |
Other consumer |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans | 1,389 | 2,160 | 2,160 |
Less: allowance for credit losses | $ (37) |  | (25) | $ (72)
Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | 2,160 |  |
Other consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Loans |  | $ 0 |  |
Less: allowance for credit losses |  |  | $ (17) |

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