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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 | 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
Before Tax |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | $ (23,943) |  |  | $ (12,590) |  |  | $ (47,225) | $ 13,227
Other comprehensive (loss)/income before tax | (38,204) |  |  | (11,909) |  |  | (86,051) | 16,316
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | (5,028) |  |  | (2,643) |  |  | (9,917) | 2,777
Other comprehensive (loss)/income | (8,023) |  |  | (2,500) |  |  | (18,071) | 3,427
After Tax |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities | (18,915) |  |  | (9,947) |  |  | (37,308) | 10,450
Less reclassification adjustments included in | 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
Unrealized (losses)/gains on cash flow hedges | (23,986) |  |  | (7,285) |  |  | (53,987) | 19,943
Cash Flow Hedge [Member] |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Other comprehensive (loss)/income before tax | (6,736) |  |  | 3,181 |  |  | (22,373) | 12,038
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (6,419) |  |  | 3,370 |  |  | (21,113) | 12,017
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive (loss)/income | (1,415) |  |  | 668 |  |  | (4,699) | 2,528
Unrealized (losses)/gains on cash flow hedges | (1,348) |  |  | 708 |  |  | (4,434) | 2,524
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | 250 |  |  | 149 |  |  | 995 | (17)
Other comprehensive (loss)/income net of tax | (5,321) |  |  | 2,513 |  |  | (17,674) | 9,510
Unrealized (losses)/gains on cash flow hedges | (5,071) |  |  | 2,662 |  |  | (16,679) | 9,493
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 | (24,925) |  |  | (13,546) |  |  | (50,272) | 8,678
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive (loss)/income | (5,234) |  |  | (2,844) |  |  | (10,557) | 1,822
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | 776 |  |  | 755 |  |  | 2,407 | 3,594
Other comprehensive (loss)/income net of tax | (19,691) |  |  | (10,702) |  |  | (39,715) | 6,856
Unrealized (losses)/gains on cash flow hedges | (18,915) |  |  | (9,947) |  |  | (37,308) | 10,450
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 | (6,543) |  |  | (1,544) |  |  | (13,406) | (4,400)
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive (loss)/income | (1,374) |  |  | (324) |  |  | (2,815) | (923)
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | 5,169 |  |  | 1,220 |  |  | 10,591 | 3,477
Other comprehensive (loss)/income net of tax | (5,169) |  |  | (1,220) |  |  | (10,591) | (3,477)
Unrealized (losses)/gains on cash flow hedges | 0 |  |  | 0 |  |  | 0 | 0
Net Interest Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedge [Member] |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (317) |  |  | (189) |  |  |  |
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (67) |  |  | (40) |  |  |  |
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (250) |  |  | (149) |  |  |  |
Net 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 | (961) |  |  | (946) |  |  | (2,870) | (4,523)
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (202) |  |  | (199) |  |  | (603) | (949)
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (759) |  |  | (747) |  |  | (2,267) | (3,574)
Net 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 | (6,543) |  |  | (1,544) |  |  | (13,406) | (4,400)
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (1,374) |  |  | (324) |  |  | (2,815) | (923)
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (5,169) |  |  | (1,220) |  |  | (10,591) | (3,477)
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 | (21) |  |  | (10) |  |  | (177) | (26)
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments included in | (4) |  |  | (2) |  |  | (37) | (6)
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in | $ (17) |  |  | $ (8) |  |  | (140) | (20)
Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedge [Member] |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in |  |  |  |  |  |  | (1,260) | 21
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments included in |  |  |  |  |  |  | (265) | 4
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments included in |  |  |  |  |  |  | $ (995) | $ 17

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