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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Before Tax |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on available-for-sale-securities, before tax | $ 48,226 |  |  | $ (23,943) |  |  | $ (6,596) | $ (47,225)
Other comprehensive income/(loss) before tax | 47,671 |  |  | (38,204) |  |  | (47,690) | (86,051)
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized holding gains/(losses) on available-for-sale securities, provision (benefit) | 10,127 |  |  | (5,028) |  |  | (1,386) | (9,917)
Other comprehensive income/(loss), provision (benefit) | 10,011 |  |  | (8,023) |  |  | (10,014) | (18,071)
After Tax |  |  |  |  |  |  |  |
Unrealized holding gains/(losses) on available-for-sale securities, after tax | 38,099 |  |  | (18,915) |  |  | (5,210) | (37,308)
Reclassification adjustments, after tax | (1,343) |  |  | (6,195) |  |  | (7,782) | (13,993)
Unrealized gains/(losses) on cash flow hedges | 39,003 |  |  | (23,986) |  |  | (29,894) | (53,987)
Other comprehensive income/(loss) net of tax | 37,660 | $ 29,940 | $ (105,276) | (30,181) | $ (34,097) | $ (3,702) | (37,676) | (67,980)
Cash Flow Hedges |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Unrealized gain/(losses) on cash flow hedges, before taxes | 1,145 |  |  | (6,419) |  |  | (31,246) | (21,113)
Other comprehensive income/(loss) before tax | 2,959 |  |  | (6,736) |  |  | (27,429) | (22,373)
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized gains/(losses) on cash flow hedges, provision (benefit) | 241 |  |  | (1,348) |  |  | (6,562) | (4,434)
Other comprehensive income/(loss), provision (benefit) | 622 |  |  | (1,415) |  |  | (5,760) | (4,699)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | 1,433 |  |  | (250) |  |  | 3,015 | (995)
Unrealized gains/(losses) on cash flow hedges | 904 |  |  | (5,071) |  |  | (24,684) | (16,679)
Other comprehensive income/(loss) net of tax | 2,337 |  |  | (5,321) |  |  | (21,669) | (17,674)
Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Other comprehensive income/(loss) before tax | 47,235 |  |  | (24,925) |  |  | (9,554) | (50,272)
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), provision (benefit) | 9,919 |  |  | (5,234) |  |  | (2,006) | (10,557)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | (783) |  |  | (776) |  |  | (2,338) | (2,407)
Unrealized gains/(losses) on cash flow hedges | 38,099 |  |  | (18,915) |  |  | (5,210) | (37,308)
Other comprehensive income/(loss) net of tax | 37,316 |  |  | (19,691) |  |  | (7,548) | (39,715)
Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Other comprehensive income/(loss) before tax | (2,523) |  |  | (6,543) |  |  | (10,707) | (13,406)
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), provision (benefit) | (530) |  |  | (1,374) |  |  | (2,248) | (2,815)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | (1,993) |  |  | (5,169) |  |  | (8,459) | (10,591)
Unrealized gains/(losses) on cash flow hedges | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income/(loss) net of tax | (1,993) |  |  | (5,169) |  |  | (8,459) | (10,591)
Net Interest Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification adjustments, before tax | (976) |  |  | (961) |  |  | (2,916) | (2,870)
Provision (Benefit) |  |  |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (205) |  |  | (202) |  |  | (612) | (603)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | (771) |  |  | (759) |  |  | (2,304) | (2,267)
Net Interest Income | Held-to-Maturity Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification adjustments, before tax | (2,523) |  |  | (6,543) |  |  | (10,707) | (13,406)
Provision (Benefit) |  |  |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (530) |  |  | (1,374) |  |  | (2,248) | (2,815)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | (1,993) |  |  | (5,169) |  |  | (8,459) | (10,591)
Other Income | Available-for-Sale Securities | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification adjustments |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification adjustments, before tax | (15) |  |  | (21) |  |  | (42) | (177)
Provision (Benefit) |  |  |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | (3) |  |  | (4) |  |  | (8) | (37)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | (12) |  |  | (17) |  |  | (34) | (140)
Interest Expense | Cash Flow Hedges | Reclassification adjustments |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Reclassification adjustments, before tax | 1,814 |  |  | (317) |  |  | 3,817 | (1,260)
Provision (Benefit) |  |  |  |  |  |  |  |
Reclassification adjustments, provision (benefit) | 381 |  |  | (67) |  |  | 802 | (265)
After Tax |  |  |  |  |  |  |  |
Reclassification adjustments, after tax | $ 1,433 |  |  | $ (250) |  |  | $ 3,015 | $ (995)

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