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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, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Other comprehensive income/(loss), Before Tax | $ (44,316) |  | $ 37,899 |  | $ 38,806 | $ (95,361)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Other comprehensive income/(loss), Provision (Benefit) | (9,305) |  | 7,959 |  | 8,150 | (20,025)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Unrealized gains/(losses), After Tax | (34,321) |  | 31,454 |  | 32,452 | (68,898)
Less reclassification adjustments, Provision (Benefit) | (690) |  | (1,514) |  | (1,796) | (6,438)
Other comprehensive (loss)/income net of tax | (35,011) | $ 65,667 | 29,940 | $ (105,276) | 30,656 | (75,336)
Securities | Available-for-Sale Securities |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Unrealized gain/(losses), Before Tax | (36,395) |  | 43,512 |  | 30,961 | (54,822)
Other comprehensive income/(loss), Before Tax | (37,389) |  | 42,527 |  | 28,975 | (56,789)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Unrealized gains/(losses), Provision (Benefit) | (7,644) |  | 9,138 |  | 6,502 | (11,512)
Other comprehensive income/(loss), Provision (Benefit) | (7,852) |  | 8,930 |  | 6,084 | (11,925)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Unrealized gains/(losses), After Tax | (28,751) |  | 34,374 |  | 24,459 | (43,310)
Other comprehensive (loss)/income net of tax | (29,537) |  | 33,597 |  | 22,891 | (44,864)
Securities | Held-to-Maturity Securities |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Less reclassification adjustments, Before Tax | (1,653) |  | (2,496) |  | (3,810) | (8,184)
Other comprehensive income/(loss), Before Tax | (1,653) |  | (2,496) |  | (3,810) | (8,184)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (347) |  | (524) |  | 800 | 1,718
Other comprehensive income/(loss), Provision (Benefit) | (347) |  | (524) |  | (800) | (1,718)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (1,306) |  | (1,972) |  | (3,010) | (6,466)
Other comprehensive (loss)/income net of tax | (1,306) |  | (1,972) |  | (3,010) | (6,466)
Securities | Net interest income | Available-for-Sale Securities |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Less reclassification adjustments, Before Tax | (987) |  | (971) |  | (1,971) | (1,940)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (207) |  | (204) |  | 415 | 407
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (780) |  | (767) |  | (1,556) | (1,533)
Securities | Other income | Available-for-Sale Securities |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Less reclassification adjustments, Before Tax | (7) |  | (14) |  | (15) | (27)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (1) |  | (4) |  | 3 | 6
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (6) |  | (10) |  | (12) | (21)
Cash flow hedges |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Unrealized gain/(losses), Before Tax | (7,050) |  | (3,695) |  | 10,118 | (32,390)
Less reclassification adjustments, Before Tax | 1,776 |  | 1,563 |  | 3,523 | 2,002
Other comprehensive income/(loss), Before Tax | (5,274) |  | (2,132) |  | 13,641 | (30,388)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Unrealized gains/(losses), Provision (Benefit) | (1,480) |  | (775) |  | 2,125 | (6,802)
Less reclassification adjustments, Provision (Benefit) | 374 |  | 328 |  | (741) | (420)
Other comprehensive income/(loss), Provision (Benefit) | (1,106) |  | (447) |  | 2,866 | (6,382)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Unrealized gains/(losses), After Tax | (5,570) |  | (2,920) |  | 7,993 | (25,588)
Less reclassification adjustments, Provision (Benefit) | 1,402 |  | 1,235 |  | 2,782 | 1,582
Other comprehensive (loss)/income net of tax | (4,168) |  | (1,685) |  | 10,775 | (24,006)
AOCI Attributable to Parent |  |  |  |  |  |
Other comprehensive income/(loss) before taxes: |  |  |  |  |  |
Other comprehensive income/(loss), Before Tax | (44,316) |  | 37,899 |  | 38,806 | (95,361)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |
Other comprehensive income/(loss), Provision (Benefit) | (9,305) |  | 7,959 |  | 8,150 | (20,025)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Other comprehensive (loss)/income net of tax | $ (35,011) |  | $ 29,940 |  | $ 30,656 | $ (75,336)

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