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Significant Accounting Policies - Impact of new financial accounting standards (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Recently Issued Accounting Standards |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,270,069 |  | $ 1,220,434 | $ 994,964 | $ 935,003
Right of use asset | 7,714 |  | 9,490 |  |
Lease liabilities | 7,757 |  | 9,552 |  |
Retained Earnings (Accumulated Deficit) | $ 20,830 |  | (14,813) |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Recently Issued Accounting Standards |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  | $ (15,922) |  |
Retained Earnings (Accumulated Deficit) |  | $ (15,900) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Allowance for credit losses on loans |  |  |  |  |
Recently Issued Accounting Standards |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | 12,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Reserve for off-balance-sheet credit exposures |  |  |  |  |
Recently Issued Accounting Standards |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 3,900 |  |  |

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