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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, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Other comprehensive (loss)/income before tax | $ (1,883) |  |  | $ (17,853) |  |  | $ 18,993 | $ (85,369)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Other comprehensive income/(loss), Provision (Benefit) | (395) |  |  | (3,748) |  |  | 3,989 | (17,927)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), After Tax | 2,620 |  |  | (12,764) |  |  | 27,484 | (69,261)
Less reclassification adjustments, Provision (Benefit) | (4,108) |  |  | (1,341) |  |  | (12,480) | 1,819
Other comprehensive (loss)/income net of tax | (1,488) | $ 25,511 | $ (9,019) | (14,105) | $ (9,819) | $ (43,518) | 15,004 | (67,442)
Securities | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized gain/(losses), Before Tax | 22,081 |  |  | (41,824) |  |  | 46,084 | (158,263)
Other comprehensive (loss)/income before tax | 22,076 |  |  | (41,827) |  |  | 46,068 | (158,273)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), Provision (Benefit) | 4,638 |  |  | (8,783) |  |  | 9,678 | (33,236)
Other comprehensive income/(loss), Provision (Benefit) | 4,637 |  |  | (8,784) |  |  | 9,675 | (33,238)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), After Tax | 17,443 |  |  | (33,041) |  |  | 36,406 | (125,027)
Other comprehensive (loss)/income net of tax | 17,439 |  |  | (33,043) |  |  | 36,393 | (125,035)
Securities | Held-to-Maturity Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized gain/(losses), Before Tax | (31,898) |  |  | 0 |  |  | (31,898) | 0
Less reclassification adjustments, Before Tax | 373 |  |  | (622) |  |  | (730) | 220
Other comprehensive (loss)/income before tax | (31,525) |  |  | (622) |  |  | (32,628) | 220
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), Provision (Benefit) | (6,699) |  |  | 0 |  |  | (6,699) | 0
Less reclassification adjustments, Provision (Benefit) | 79 |  |  | (130) |  |  | (153) | 47
Other comprehensive income/(loss), Provision (Benefit) | (6,620) |  |  | (130) |  |  | (6,852) | 47
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), After Tax | (25,199) |  |  | 0 |  |  | (25,199) | 0
Less reclassification adjustments, Provision (Benefit) | 294 |  |  | (492) |  |  | (577) | 173
Other comprehensive (loss)/income net of tax | (24,905) |  |  | (492) |  |  | (25,776) | 173
Securities | Net interest income | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Less reclassification adjustments, Before Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | 0 |  |  | 0 |  |  | 0 | 0
Securities | Other income | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Less reclassification adjustments, Before Tax | (5) |  |  | (3) |  |  | (16) | (10)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (1) |  |  | (1) |  |  | (3) | (2)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Less reclassification adjustments, Provision (Benefit) | (4) |  |  | (2) |  |  | (13) | (8)
Cash Flow Hedges |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized gain/(losses), Before Tax | 13,135 |  |  | 25,668 |  |  | 20,604 | 70,590
Less reclassification adjustments, Before Tax | (5,569) |  |  | (1,072) |  |  | (15,051) | 2,094
Other comprehensive (loss)/income before tax | 7,566 |  |  | 24,596 |  |  | 5,553 | 72,684
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), Provision (Benefit) | 2,759 |  |  | 5,391 |  |  | 4,327 | 14,824
Less reclassification adjustments, Provision (Benefit) | (1,171) |  |  | (225) |  |  | (3,161) | 440
Other comprehensive income/(loss), Provision (Benefit) | 1,588 |  |  | 5,166 |  |  | 1,166 | 15,264
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Unrealized gains/(losses), After Tax | 10,376 |  |  | 20,277 |  |  | 16,277 | 55,766
Less reclassification adjustments, Provision (Benefit) | (4,398) |  |  | (847) |  |  | (11,890) | 1,654
Other comprehensive (loss)/income net of tax | 5,978 |  |  | 19,430 |  |  | 4,387 | 57,420
AOCI Attributable to Parent |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Other comprehensive (loss)/income before tax | (1,883) |  |  | (17,853) |  |  | 18,993 | (85,369)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |  |  |  |  |
Other comprehensive income/(loss), Provision (Benefit) | (395) |  |  | (3,748) |  |  | 3,989 | (17,927)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Other comprehensive (loss)/income net of tax | $ (1,488) |  |  | $ (14,105) |  |  | $ 15,004 | $ (67,442)

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