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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 773,742 | $ 763,298 | $ 752,557 | $ 766,212 | $ 745,266 | $ 708,146 | $ 752,557 | $ 708,146 |  |  |
Cumulative effect from change in hedge accounting |  |  |  |  |  |  |  |  |  | $ 27 |
Adjusted Beginning Balance |  |  |  |  |  |  |  |  |  |  | $ 708,644
Other comprehensive (loss)/income before reclassifications | (23,986) |  |  | (7,285) |  |  | (53,987) | 19,943 |  |  |
Amounts reclassified from AOCI | (6,195) |  |  | (2,124) |  |  | (13,993) | (7,054) |  |  |
Other comprehensive (loss)/income net of tax | (30,181) | (34,097) | (3,702) | (9,409) | 1,299 | 20,999 | (67,980) | 12,889 |  |  |
Ending balance | 750,259 | 773,742 | 763,298 | 777,591 | 766,212 | 745,266 | 750,259 | 777,591 |  |  |
Total [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance | (12,843) | 21,254 | 24,956 | 73,410 | 72,111 | 51,085 | 24,956 | 51,085 |  |  |
Adjusted Beginning Balance |  |  |  |  |  |  |  |  | $ 24,956 | 51,112 | $ 51,112
Other comprehensive (loss)/income net of tax | (30,181) | (34,097) | (3,702) | (9,409) | 1,299 | 20,999 |  |  |  |  |
Ending balance | (43,024) | (12,843) | 21,254 | 64,001 | 73,410 | 72,111 | (43,024) | 64,001 |  |  |
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 | (45,384) |  | (25,360) | 15,882 |  | (1,676) | (25,360) | (1,676) |  |  |
Adjusted Beginning Balance |  |  |  |  |  |  |  |  | (25,360) | (1,676) |
Other comprehensive (loss)/income before reclassifications | (18,915) |  |  | (9,947) |  |  | (37,308) | 10,450 |  |  |
Amounts reclassified from AOCI | (776) |  |  | (755) |  |  | (2,407) | (3,594) |  |  |
Other comprehensive (loss)/income net of tax | (19,691) |  |  | (10,702) |  |  | (39,715) | 6,856 |  |  |
Ending balance | (65,075) | (45,384) |  | 5,180 | 15,882 |  | (65,075) | 5,180 |  |  |
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 | 38,021 |  | 43,443 | 45,979 |  | 48,236 | 43,443 | 48,236 |  |  |
Adjusted Beginning Balance |  |  |  |  |  |  |  |  | 43,443 | 48,236 |
Other comprehensive (loss)/income before reclassifications | 0 |  |  | 0 |  |  | 0 | 0 |  |  |
Amounts reclassified from AOCI | (5,169) |  |  | (1,220) |  |  | (10,591) | (3,477) |  |  |
Other comprehensive (loss)/income net of tax | (5,169) |  |  | (1,220) |  |  | (10,591) | (3,477) |  |  |
Ending balance | 32,852 | 38,021 |  | 44,759 | 45,979 |  | 32,852 | 44,759 |  |  |
Cash Flow Hedge [Member] |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance | (5,480) |  | $ 6,873 | 11,549 |  | $ 4,525 | 6,873 | 4,525 |  |  |
Cumulative effect from change in hedge accounting |  |  |  |  |  |  |  |  |  | 27 |
Adjusted Beginning Balance |  |  |  |  |  |  |  |  | $ 6,873 | $ 4,552 |
Other comprehensive (loss)/income before reclassifications | (5,071) |  |  | 2,662 |  |  | (16,679) | 9,493 |  |  |
Amounts reclassified from AOCI | (250) |  |  | (149) |  |  | (995) | 17 |  |  |
Other comprehensive (loss)/income net of tax | (5,321) |  |  | 2,513 |  |  | (17,674) | 9,510 |  |  |
Ending balance | $ (10,801) | $ (5,480) |  | $ 14,062 | $ 11,549 |  | $ (10,801) | $ 14,062 |  |  |

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