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Significant Accounting Policies - Impact of new financial accounting standards (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Recently Issued Accounting Standards |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,255,705 | $ 1,236,084 |  | $ 1,220,434 | $ 1,215,981 | $ 1,203,608 | $ 994,964
Right of use asset | 7,251 |  |  | 9,490 |  |  |
Lease liability | 7,342 |  |  | 9,552 |  |  |
Retained Earnings (Accumulated Deficit) | 4,718 |  |  | $ (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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