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Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 752,557 | $ 708,146 | $ 643,647 |
Beginning balance, as adjusted |  |  |  | $ 708,644
Other comprehensive income before reclassifications | (26,537) | (16,580) | 24,077 |
Amounts reclassified from AOCI | (14,580) | (9,576) | (15,803) |
Other comprehensive (loss)/income net of tax | (41,117) | (26,156) | 8,274 |
Stranded tax effects reclassified from AOCI due to enactment of new tax legislation |  |  | 9,053 |
Cumulative effect from change in hedge accounting |  |  |  | 27
Ending balance | 799,276 | 752,557 | 708,146 |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Available-for-Sale Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (25,360) | (1,676) | (14,387) |
Beginning balance, as adjusted |  |  |  | (1,676)
Other comprehensive income before reclassifications | (14,976) | (19,151) | 23,925 |
Amounts reclassified from AOCI | (3,061) | (4,533) | (10,917) |
Other comprehensive (loss)/income net of tax | (18,037) | (23,684) | 13,008 |
Stranded tax effects reclassified from AOCI due to enactment of new tax legislation |  |  | (297) |
Cumulative effect from change in hedge accounting |  |  |  | 0
Ending balance | (43,397) | (25,360) | (1,676) |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Held-to-Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 43,443 | 48,236 | 45,752 |
Beginning balance, as adjusted |  |  |  | 48,236
Other comprehensive income before reclassifications | 0 | 0 | 0 |
Amounts reclassified from AOCI | (10,598) | (4,793) | (6,064) |
Other comprehensive (loss)/income net of tax | (10,598) | (4,793) | (6,064) |
Stranded tax effects reclassified from AOCI due to enactment of new tax legislation |  |  | 8,548 |
Cumulative effect from change in hedge accounting |  |  |  | 0
Ending balance | 32,845 | 43,443 | 48,236 |
Cash Flow Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 6,873 | 4,525 | 2,393 |
Beginning balance, as adjusted |  |  |  | 4,552
Other comprehensive income before reclassifications | (11,561) | 2,571 | 152 |
Amounts reclassified from AOCI | (921) | (250) | 1,178 |
Other comprehensive (loss)/income net of tax | (12,482) | 2,321 | 1,330 |
Stranded tax effects reclassified from AOCI due to enactment of new tax legislation |  |  | 802 |
Cumulative effect from change in hedge accounting |  |  |  | 27
Ending balance | (5,609) | 6,873 | 4,525 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 24,956 | 51,085 | 33,758 |
Beginning balance, as adjusted |  |  |  | $ 51,112
Other comprehensive (loss)/income net of tax | (41,117) | (26,156) | 8,274 |
Ending balance | $ (16,161) | $ 24,956 | $ 51,085 |

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