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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Available for sale debt securities |  |  |
Amortized Cost | $ 4,267,809,000 | $ 4,267,809,000 | $ 8,560,733,000
Unrealized Gains | 987,000 | 987,000 | 24,595,000
Unrealized Losses | (301,050,000) | (301,050,000) | (157,296,000)
Total available-for-sale securities, Fair value, | 3,967,746,000 | 3,967,746,000 | 8,428,032,000
Held to maturity securities |  |  |
Amortized Cost | 4,093,215,000 | 4,093,215,000 |
Unrealized Losses | (182,435,000) | (182,435,000) |
Total held to maturity, Fair value, | 3,910,780,000 | 3,910,780,000 | 0
Available-for-sale investment securities |  |  |
Accrued interest receivable related to available-for-sale investment securities | 8,700,000 | 8,700,000 | 14,100,000
Accrued interest receivable related to held to maturity investment securities | 7,000,000.0 | 7,000,000.0 | 0
Reclassification of available for sale securities to held to maturity | 4,100,000,000 | 4,100,000,000 |
Other comprehensive income (loss), transfer of securities from available for sale to held to maturity | 338,800,000 | 338,800,000 |
Gain (loss) recognized on reclassification, transfer of securities from available for sale to held to maturity | 0 | $ 0 |
Securities held-to-maturity, weighted average life |  | 8 years |
Collateralized Loan Obligations |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 249,905,000 | $ 249,905,000 | 105,245,000
Unrealized Gains | 45,000 | 45,000 | 2,000
Unrealized Losses | (3,247,000) | (3,247,000) |
Total available-for-sale securities, Fair value, | 246,703,000 | 246,703,000 | 105,247,000
U.S. Treasury and government agency debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 168,129,000 | 168,129,000 | 196,662,000
Unrealized Gains |  |  | 125,000
Unrealized Losses | (8,964,000) | (8,964,000) | (4,224,000)
Total available-for-sale securities, Fair value, | 159,165,000 | 159,165,000 | 192,563,000
Held to maturity securities |  |  |
Amortized Cost | 55,148,000 | 55,148,000 |
Unrealized Losses | (2,405,000) | (2,405,000) |
Total held to maturity, Fair value, | 52,743,000 | 52,743,000 |
Government-sponsored enterprises debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 20,000,000 | 20,000,000 |
Unrealized Losses | (37,000) | (37,000) |
Total available-for-sale securities, Fair value, | 19,963,000 | 19,963,000 |
Residential - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 72,027,000 | 72,027,000 | 135,764,000
Unrealized Gains |  |  | 1,791,000
Unrealized Losses | (4,069,000) | (4,069,000) | (291,000)
Total available-for-sale securities, Fair value, | 67,958,000 | 67,958,000 | 137,264,000
Held to maturity securities |  |  |
Amortized Cost | 47,309,000 | 47,309,000 |
Unrealized Losses | (3,031,000) | (3,031,000) |
Total held to maturity, Fair value, | 44,278,000 | 44,278,000 |
Residential - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 1,444,461,000 | 1,444,461,000 | 1,496,605,000
Unrealized Gains | 24,000 | 24,000 | 6,914,000
Unrealized Losses | (111,470,000) | (111,470,000) | (12,419,000)
Total available-for-sale securities, Fair value, | 1,333,015,000 | 1,333,015,000 | 1,491,100,000
Held to maturity securities |  |  |
Amortized Cost | 93,458,000 | 93,458,000 |
Unrealized Losses | (6,117,000) | (6,117,000) |
Total held to maturity, Fair value, | 87,341,000 | 87,341,000 |
Commercial - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 297,271,000 | 297,271,000 | 392,443,000
Unrealized Gains |  |  | 1,741,000
Unrealized Losses | (29,614,000) | (29,614,000) | (6,521,000)
Total available-for-sale securities, Fair value, | 267,657,000 | 267,657,000 | 387,663,000
Held to maturity securities |  |  |
Amortized Cost | 30,497,000 | 30,497,000 |
Unrealized Losses | (2,685,000) | (2,685,000) |
Total held to maturity, Fair value, | 27,812,000 | 27,812,000 |
Commercial - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 147,160,000 | 147,160,000 | 1,415,511,000
Unrealized Gains | 918,000 | 918,000 | 2,646,000
Unrealized Losses | (6,242,000) | (6,242,000) | (48,714,000)
Total available-for-sale securities, Fair value, | 141,836,000 | 141,836,000 | 1,369,443,000
Held to maturity securities |  |  |
Amortized Cost | 1,173,398,000 | 1,173,398,000 |
Unrealized Losses | (63,627,000) | (63,627,000) |
Total held to maturity, Fair value, | 1,109,771,000 | 1,109,771,000 |
Commercial - Non -agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 21,957,000 | 21,957,000 |
Unrealized Losses | (407,000) | (407,000) |
Total available-for-sale securities, Fair value, | 21,550,000 | 21,550,000 |
Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 1,102,277,000 | 1,102,277,000 | 2,103,187,000
Unrealized Gains |  |  | 7,768,000
Unrealized Losses | (76,938,000) | (76,938,000) | (31,432,000)
Total available-for-sale securities, Fair value, | 1,025,339,000 | 1,025,339,000 | 2,079,523,000
Held to maturity securities |  |  |
Amortized Cost | 879,010,000 | 879,010,000 |
Unrealized Losses | (31,243,000) | (31,243,000) |
Total held to maturity, Fair value, | 847,767,000 | 847,767,000 |
Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 744,622,000 | 744,622,000 | 2,671,131,000
Unrealized Gains |  |  | 3,608,000
Unrealized Losses | (60,062,000) | (60,062,000) | (53,695,000)
Total available-for-sale securities, Fair value, | 684,560,000 | 684,560,000 | 2,621,044,000
Held to maturity securities |  |  |
Amortized Cost | 1,760,755,000 | 1,760,755,000 |
Unrealized Losses | (69,483,000) | (69,483,000) |
Total held to maturity, Fair value, | 1,691,272,000 | 1,691,272,000 |
Debt securities issued by states and political subdivisions |  |  |
Available for sale debt securities |  |  |
Amortized Cost |  |  | 44,185,000
Total available-for-sale securities, Fair value, |  |  | $ 44,185,000
Held to maturity securities |  |  |
Amortized Cost | 53,640,000 | 53,640,000 |
Unrealized Losses | (3,844,000) | (3,844,000) |
Total held to maturity, Fair value, | $ 49,796,000 | $ 49,796,000 |

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