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Summary of Significant Accounting Policies - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 752,557 | $ 708,146 |  |
Cumulative effect from change in hedge accounting |  |  |  | $ 27
Adjusted Beginning Balance |  |  |  | 708,644
Other comprehensive income/(loss) before reclassifications | (777) | 23,240 |  |
Amounts reclassified from AOCI | (2,925) | (2,241) |  |
Other comprehensive (loss)/income net of tax | (3,702) | 20,999 |  |
Ending balance | 763,298 | 745,266 |  |
Total [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 24,956 | 51,085 |  |
Adjusted Beginning Balance |  |  | $ 24,956 | 51,112
Other comprehensive (loss)/income net of tax | (3,702) | 20,999 |  |
Ending balance | 21,254 | 72,111 |  |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (25,360) | (1,676) |  |
Adjusted Beginning Balance |  |  | (25,360) | (1,676)
Other comprehensive income/(loss) before reclassifications | 3,318 | 18,187 |  |
Amounts reclassified from AOCI | (758) | (1,417) |  |
Other comprehensive (loss)/income net of tax | 2,560 | 16,770 |  |
Ending balance | (22,800) | 15,094 |  |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 43,443 | 48,236 |  |
Adjusted Beginning Balance |  |  | 43,443 | 48,236
Other comprehensive income/(loss) before reclassifications | 0 | 0 |  |
Amounts reclassified from AOCI | (1,787) | (1,035) |  |
Other comprehensive (loss)/income net of tax | (1,787) | (1,035) |  |
Ending balance | 41,656 | 47,201 |  |
Cash Flow Hedge [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 6,873 | 4,525 |  |
Cumulative effect from change in hedge accounting |  |  |  | 27
Adjusted Beginning Balance |  |  | $ 6,873 | $ 4,552
Other comprehensive income/(loss) before reclassifications | (4,095) | 5,053 |  |
Amounts reclassified from AOCI | (380) | 211 |  |
Other comprehensive (loss)/income net of tax | (4,475) | 5,264 |  |
Ending balance | $ 2,398 | $ 9,816 |  |

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