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Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | $ 5,609,482 | $ 5,837,218 | $ 5,547,548 | $ 5,837,218 | $ 5,269,175
Other comprehensive loss | (199,384) |  | (42,879) | (709,651) | (101,893)
Ending balance | 5,660,668 |  | 5,690,201 | 5,660,668 | 5,690,201
Net changes in unrealized gains (losses) on securities transferred from AFS to HTM |  | 113,000 |  |  |
Debt Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (554,781) | (85,703) | (8,152) | (85,703) | 52,247
Net unrealized losses arising during the period | (161,445) |  | (40,928) | (635,664) | (100,747)
Amounts reclassified from AOCI | 3,256 |  | (250) | 8,397 | (830)
Other comprehensive loss | (158,189) |  | (41,178) | (627,267) | (101,577)
Ending balance | (712,970) |  | (49,330) | (712,970) | (49,330)
Net changes in unrealized gains (losses) on securities transferred from AFS to HTM | (3,256) |  | 0 | (9,317) | 0
Cash Flow Hedges |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (30,846) | 257 | (730) | 257 | (1,230)
Net unrealized losses arising during the period | (34,423) |  | (121) | (63,232) | 108
Amounts reclassified from AOCI | 1,154 |  | 172 | (1,140) | 443
Other comprehensive loss | (33,269) |  | 51 | (64,372) | 551
Ending balance | (64,115) |  | (679) | (64,115) | (679)
Foreign Currency Translation Adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (15,021) | (4,935) | (5,807) | (4,935) | (6,692)
Net unrealized losses arising during the period | (7,926) |  | (1,752) | (18,012) | (867)
Amounts reclassified from AOCI | 0 |  | 0 | 0 | 0
Other comprehensive loss | (7,926) |  | (1,752) | (18,012) | (867)
Ending balance | (22,947) |  | (7,559) | (22,947) | (7,559)
AOCI, Net of Tax |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (600,648) | $ (90,381) | (14,689) | (90,381) | 44,325
Net unrealized losses arising during the period | (203,794) |  | (42,801) | (716,908) | (101,506)
Amounts reclassified from AOCI | 4,410 |  | (78) | 7,257 | (387)
Other comprehensive loss | (199,384) |  | (42,879) | (709,651) | (101,893)
Ending balance | $ (800,032) |  | $ (57,568) | $ (800,032) | $ (57,568)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount, after tax, of adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560 + Details
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