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Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Before Tax |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | $ (27,482) |  | $ 2,795 |  | $ (23,282) | $ 25,817
Other comprehensive (loss)/income before tax | (43,161) |  | 1,644 |  | (47,847) | 28,225
Provision (Benefit) |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | (5,771) |  | 586 |  | (4,889) | 5,421
Other comprehensive (loss)/income | (9,064) |  | 345 |  | (10,048) | 5,927
After Tax |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | (21,711) |  | 2,209 |  | (18,393) | 20,396
Less reclassification adjustments included in | 4,874 |  | 2,688 |  | 7,798 | 4,929
Other comprehensive (loss)/income net of tax | (34,097) | $ (3,702) | 1,299 | $ 20,999 | (37,799) | 22,298
Unrealized (losses)/gains on cash flow hedges | (29,223) |  | 3,987 |  | (30,001) | 27,227
Cash Flow Hedge [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive (loss)/income before tax | (9,972) |  | 2,194 |  | (15,637) | 8,857
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (9,510) |  | 2,251 |  | (14,695) | 8,647
Provision (Benefit) |  |  |  |  |  |
Other comprehensive (loss)/income | (2,094) |  | 461 |  | (3,284) | 1,860
Unrealized (losses)/gains on cash flow hedges | (1,998) |  | 473 |  | (3,087) | 1,816
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | 366 |  | 45 |  | 745 | (166)
Other comprehensive (loss)/income net of tax | (7,878) |  | 1,733 |  | (12,353) | 6,997
Unrealized (losses)/gains on cash flow hedges | (7,512) |  | 1,778 |  | (11,608) | 6,831
Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive (loss)/income before tax | (28,588) |  | 996 |  | (25,347) | 22,224
Provision (Benefit) |  |  |  |  |  |
Other comprehensive (loss)/income | (6,004) |  | 208 |  | (5,323) | 4,666
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | 873 |  | 1,421 |  | 1,631 | 2,838
Other comprehensive (loss)/income net of tax | (22,584) |  | 788 |  | (20,024) | 17,558
Unrealized (losses)/gains on cash flow hedges | (21,711) |  | 2,209 |  | (18,393) | 20,396
Held-to-maturity Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive (loss)/income before tax | (4,601) |  | (1,546) |  | (6,863) | (2,856)
Provision (Benefit) |  |  |  |  |  |
Other comprehensive (loss)/income | (966) |  | (324) |  | (1,441) | (599)
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | 3,635 |  | 1,222 |  | 5,422 | 2,257
Other comprehensive (loss)/income net of tax | (3,635) |  | (1,222) |  | (5,422) | (2,257)
Unrealized (losses)/gains on cash flow hedges | 0 |  | 0 |  | 0 | 0
Interest Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Less reclassification adjustments included in | (956) |  | (1,791) |  | (1,909) | (3,578)
Provision (Benefit) |  |  |  |  |  |
Less reclassification adjustments included in | (201) |  | (376) |  | (401) | (752)
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | (755) |  | (1,415) |  | (1,508) | (2,826)
Interest Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Held-to-maturity Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Less reclassification adjustments included in | (4,601) |  | (1,546) |  | (6,863) | (2,856)
Provision (Benefit) |  |  |  |  |  |
Less reclassification adjustments included in | (966) |  | (324) |  | (1,441) | (599)
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | (3,635) |  | (1,222) |  | (5,422) | (2,257)
Other Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Less reclassification adjustments included in | (150) |  | (8) |  | (156) | (15)
Provision (Benefit) |  |  |  |  |  |
Less reclassification adjustments included in | (32) |  | (2) |  | (33) | (3)
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | (118) |  | (6) |  | (123) | (12)
Net interest income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedge [Member] |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Less reclassification adjustments included in | (462) |  | (57) |  | (942) | 210
Provision (Benefit) |  |  |  |  |  |
Less reclassification adjustments included in | (96) |  | (12) |  | (197) | 44
After Tax |  |  |  |  |  |
Less reclassification adjustments included in | $ (366) |  | $ (45) |  | $ (745) | $ 166

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