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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, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Before Tax |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities, before tax | $ 43,512 |  | $ (27,482) |  | $ (54,822) | $ (23,282)
Other comprehensive gain/(loss) before tax | 37,899 |  | (43,161) |  | (95,361) | (47,847)
Provision (Benefit) |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale securities, provision (benefit) | 9,138 |  | (5,771) |  | (11,512) | (4,889)
Other comprehensive (loss)/income provision (benefit) | 7,959 |  | (9,064) |  | (20,025) | (10,048)
After Tax |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale securities, after tax | 34,374 |  | (21,711) |  | (43,310) | (18,393)
Reclassification adjustments, after tax | (1,514) |  | (4,874) |  | (6,438) | (7,798)
Other comprehensive income before reclassifications | 31,454 |  | (29,223) |  | (68,898) | (30,001)
Other comprehensive gain/(loss) net of tax | 29,940 | $ (105,276) | (34,097) | $ (3,702) | (75,336) | (37,799)
Cash Flow Hedges |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Unrealized (losses)/gains on cash flow hedges, before tax | (3,695) |  | (9,510) |  | (32,390) | (14,695)
Other comprehensive gain/(loss) before tax | (2,132) |  | (9,972) |  | (30,388) | (15,637)
Provision (Benefit) |  |  |  |  |  |
Unrealized (losses)/gains on cash flow hedges, provision (benefit) | (775) |  | (1,998) |  | (6,802) | (3,087)
Other comprehensive (loss)/income provision (benefit) | (447) |  | (2,094) |  | (6,382) | (3,284)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | 1,235 |  | (366) |  | 1,582 | (745)
Other comprehensive income before reclassifications | (2,920) |  | (7,512) |  | (25,588) | (11,608)
Other comprehensive gain/(loss) net of tax | (1,685) |  | (7,878) |  | (24,006) | (12,353)
Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive gain/(loss) before tax | 42,527 |  | (28,588) |  | (56,789) | (25,347)
Provision (Benefit) |  |  |  |  |  |
Other comprehensive (loss)/income provision (benefit) | 8,930 |  | (6,004) |  | (11,925) | (5,323)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | (777) |  | (873) |  | (1,554) | (1,631)
Other comprehensive income before reclassifications | 34,374 |  | (21,711) |  | (43,310) | (18,393)
Other comprehensive gain/(loss) net of tax | 33,597 |  | (22,584) |  | (44,864) | (20,024)
Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Other comprehensive gain/(loss) before tax | (2,496) |  | (4,601) |  | (8,184) | (6,863)
Provision (Benefit) |  |  |  |  |  |
Other comprehensive (loss)/income provision (benefit) | (524) |  | (966) |  | (1,718) | (1,441)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | (1,972) |  | (3,635) |  | (6,466) | (5,422)
Other comprehensive income before reclassifications | 0 |  | 0 |  | 0 | 0
Other comprehensive gain/(loss) net of tax | (1,972) |  | (3,635) |  | (6,466) | (5,422)
Net Interest Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification adjustments, before tax | (971) |  | (956) |  | (1,940) | (1,909)
Provision (Benefit) |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (204) |  | (201) |  | (407) | (401)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | (767) |  | (755) |  | (1,533) | (1,508)
Net Interest Income | Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification adjustments, before tax | (2,496) |  | (4,601) |  | (8,184) | (6,863)
Provision (Benefit) |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (524) |  | (966) |  | (1,718) | (1,441)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | (1,972) |  | (3,635) |  | (6,466) | (5,422)
Other Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification adjustments, before tax | (14) |  | (150) |  | (27) | (156)
Provision (Benefit) |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (4) |  | (32) |  | (6) | (33)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | (10) |  | (118) |  | (21) | (123)
Interest Expense | Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Before Tax |  |  |  |  |  |
Reclassification adjustments, before tax | 1,563 |  | (462) |  | 2,002 | (942)
Provision (Benefit) |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | 328 |  | (96) |  | 420 | (197)
After Tax |  |  |  |  |  |
Reclassification adjustments, after tax | $ 1,235 |  | $ (366) |  | $ 1,582 | $ (745)

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