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Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Before Tax |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities, before tax | $ (18,958) | $ (24,241) | $ 36,809
Other comprehensive (loss)/income before tax | (52,047) | (33,109) | 12,729
Provision (Benefit) |  |  |
Unrealized holding (losses)/gains on available-for-sale securities, provision (benefit) | (3,982) | (5,090) | 12,884
Other comprehensive (loss)/income provision (benefit) | (10,930) | (6,953) | 4,455
After Tax |  |  |
Unrealized holding (losses)/gains on available-for-sale securities, after tax | (14,976) | (19,151) | 23,925
Reclassification adjustments, after tax | (14,580) | (9,576) | (15,803)
Other comprehensive income before reclassifications | (26,537) | (16,580) | 24,077
Other comprehensive (loss)/income net of tax | (41,117) | (26,156) | 8,274
Cash Flow Hedges |  |  |
Before Tax |  |  |
Unrealized (losses)/gains on cash flow hedges, before tax | (14,635) | 3,254 | 233
Other comprehensive (loss)/income before tax | (15,801) | 2,938 | 2,046
Provision (Benefit) |  |  |
Unrealized (losses)/gains on cash flow hedges, provision (benefit) | (3,074) | 683 | 81
Other comprehensive (loss)/income provision (benefit) | (3,319) | 617 | 716
After Tax |  |  |
Reclassification adjustments, after tax | (921) | (250) | 1,178
Other comprehensive income before reclassifications | (11,561) | 2,571 | 152
Other comprehensive (loss)/income net of tax | (12,482) | 2,321 | 1,330
Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Other comprehensive (loss)/income before tax | (22,831) | (29,980) | 20,012
Provision (Benefit) |  |  |
Other comprehensive (loss)/income provision (benefit) | (4,794) | (6,296) | 7,004
After Tax |  |  |
Reclassification adjustments, after tax | (3,061) | (4,533) | (10,917)
Other comprehensive income before reclassifications | (14,976) | (19,151) | 23,925
Other comprehensive (loss)/income net of tax | (18,037) | (23,684) | 13,008
Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Other comprehensive (loss)/income before tax | (13,415) | (6,067) | (9,329)
Provision (Benefit) |  |  |
Other comprehensive (loss)/income provision (benefit) | (2,817) | (1,274) | (3,265)
After Tax |  |  |
Reclassification adjustments, after tax | (10,598) | (4,793) | (6,064)
Other comprehensive income before reclassifications | 0 | 0 | 0
Other comprehensive (loss)/income net of tax | (10,598) | (4,793) | (6,064)
Gains/(losses) on financial derivatives | Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | 0 | 0 | (16,845)
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | 0 | 0 | (5,897)
After Tax |  |  |
Reclassification adjustments, after tax | 0 | 0 | (10,948)
Gain (Loss) on Investments | Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | 236 | 0 | (89)
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | 50 | 0 | (31)
After Tax |  |  |
Reclassification adjustments, after tax | 186 | 0 | (58)
Net Interest Income | Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | (3,834) | (5,784) | 0
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | (805) | (1,215) | 0
After Tax |  |  |
Reclassification adjustments, after tax | (3,029) | (4,569) | 0
Net Interest Income | Reclassification out of Accumulated Other Comprehensive Income | Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | (13,415) | (6,067) | (9,329)
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | (2,817) | (1,274) | (3,265)
After Tax |  |  |
Reclassification adjustments, after tax | (10,598) | (4,793) | (6,064)
Other Income | Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | (275) | 45 | 137
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | (57) | 9 | 48
After Tax |  |  |
Reclassification adjustments, after tax | (218) | 36 | 89
Interest Expense | Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges |  |  |
Before Tax |  |  |
Reclassification adjustments, before tax | (1,166) | (316) | 1,813
Provision (Benefit) |  |  |
Reclassification adjustments, provision (benefit) | (245) | (66) | 635
After Tax |  |  |
Reclassification adjustments, after tax | $ (921) | $ (250) | $ 1,178

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