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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
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Before Tax |  |
Unrealized holding (losses)/gains on available-for-sale-securities, before tax | $ (98,334) | $ 4,200
Other comprehensive loss before tax | (133,260) | (4,686)
Provision (Benefit) |  |
Unrealized holding (losses)/gains on available-for-sale securities, provision (benefit) | (20,649) | 882
Other comprehensive (loss)/income provision (benefit) | (27,984) | (984)
After Tax |  |
Unrealized holding (losses)/gains on available-for-sale securities, after tax | (77,685) | 3,318
Reclassification adjustments, after tax | (4,923) | (2,925)
Other comprehensive income before reclassifications | (100,353) | (777)
Other comprehensive loss net of tax | (105,276) | (3,702)
Cash Flow Hedges |  |
Before Tax |  |
Unrealized (losses)/gains on cash flow hedges, before tax | (28,695) | (5,184)
Other comprehensive loss before tax | (28,256) | (5,665)
Provision (Benefit) |  |
Unrealized (losses)/gains on cash flow hedges, provision (benefit) | (6,027) | (1,089)
Other comprehensive (loss)/income provision (benefit) | (5,935) | (1,190)
After Tax |  |
Reclassification adjustments, after tax | 347 | (380)
Other comprehensive income before reclassifications | (22,668) | (4,095)
Other comprehensive loss net of tax | (22,321) | (4,475)
Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |
Before Tax |  |
Other comprehensive loss before tax | (99,316) | 3,241
Provision (Benefit) |  |
Other comprehensive (loss)/income provision (benefit) | (20,855) | 681
After Tax |  |
Reclassification adjustments, after tax | (776) | (758)
Other comprehensive income before reclassifications | (77,685) | 3,318
Other comprehensive loss net of tax | (78,461) | 2,560
Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |
Before Tax |  |
Other comprehensive loss before tax | (5,688) | (2,262)
Provision (Benefit) |  |
Other comprehensive (loss)/income provision (benefit) | (1,194) | (475)
After Tax |  |
Reclassification adjustments, after tax | (4,494) | (1,787)
Other comprehensive income before reclassifications | 0 | 0
Other comprehensive loss net of tax | (4,494) | (1,787)
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 | (969) | (953)
Provision (Benefit) |  |
Reclassification adjustments, provision (benefit) | (203) | (200)
After Tax |  |
Reclassification adjustments, after tax | (766) | (753)
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 | (5,688) | (2,262)
Provision (Benefit) |  |
Reclassification adjustments, provision (benefit) | (1,194) | (475)
After Tax |  |
Reclassification adjustments, after tax | (4,494) | (1,787)
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 | (13) | (6)
Provision (Benefit) |  |
Reclassification adjustments, provision (benefit) | (3) | (1)
After Tax |  |
Reclassification adjustments, after tax | (10) | (5)
Interest Expense | Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |
Before Tax |  |
Reclassification adjustments, before tax | 439 | (481)
Provision (Benefit) |  |
Reclassification adjustments, provision (benefit) | 92 | (101)
After Tax |  |
Reclassification adjustments, after tax | $ 347 | $ (380)

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