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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Available for sale debt securities |  |  |
Amortized Cost | $ 3,673,396,000 | $ 3,673,396,000 | $ 8,560,733,000
Unrealized Gains | 51,000 | 51,000 | 24,595,000
Unrealized Losses | (384,287,000) | (384,287,000) | (157,296,000)
Total available-for-sale securities, Fair value, | 3,289,160,000 | 3,289,160,000 | 8,428,032,000
Held to maturity securities |  |  |
Amortized Cost | 4,406,143,000 | 4,406,143,000 |
Unrealized Losses | (445,430,000) | (445,430,000) |
Total held to maturity, Fair value, | 3,960,713,000 | 3,960,713,000 | 0
Available-for-sale investment securities |  |  |
Accrued interest receivable related to available-for-sale investment securities | 8,600,000 | 8,600,000 | 14,100,000
Accrued interest receivable related to held to maturity investment securities | 7,900,000 | 7,900,000 | 0
Reclassification of available for sale securities to held to maturity | 417,400,000 | 4,600,000,000 |
Other comprehensive income (loss), transfer of securities from available for sale to held to maturity |  | (372,400,000) |
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 1 month 6 days | 8 years 1 month 6 days |
Collateralized Loan Obligations |  |  |
Available for sale debt securities |  |  |
Amortized Cost | $ 249,924,000 | $ 249,924,000 | 105,245,000
Unrealized Gains | 51,000 | 51,000 | 2,000
Unrealized Losses | (4,455,000) | (4,455,000) |
Total available-for-sale securities, Fair value, | 245,520,000 | 245,520,000 | 105,247,000
U.S. Treasury and government agency debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 165,713,000 | 165,713,000 | 196,662,000
Unrealized Gains |  |  | 125,000
Unrealized Losses | (13,191,000) | (13,191,000) | (4,224,000)
Total available-for-sale securities, Fair value, | 152,522,000 | 152,522,000 | 192,563,000
Held to maturity securities |  |  |
Amortized Cost | 55,069,000 | 55,069,000 |
Unrealized Losses | (5,579,000) | (5,579,000) |
Total held to maturity, Fair value, | 49,490,000 | 49,490,000 |
Government-sponsored enterprises debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 45,000,000 | 45,000,000 |
Unrealized Losses | (674,000) | (674,000) |
Total available-for-sale securities, Fair value, | 44,326,000 | 44,326,000 |
Residential - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 68,969,000 | 68,969,000 | 135,764,000
Unrealized Gains |  |  | 1,791,000
Unrealized Losses | (7,335,000) | (7,335,000) | (291,000)
Total available-for-sale securities, Fair value, | 61,634,000 | 61,634,000 | 137,264,000
Held to maturity securities |  |  |
Amortized Cost | 46,695,000 | 46,695,000 |
Unrealized Losses | (5,228,000) | (5,228,000) |
Total held to maturity, Fair value, | 41,467,000 | 41,467,000 |
Residential - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 1,366,912,000 | 1,366,912,000 | 1,496,605,000
Unrealized Gains |  |  | 6,914,000
Unrealized Losses | (169,071,000) | (169,071,000) | (12,419,000)
Total available-for-sale securities, Fair value, | 1,197,841,000 | 1,197,841,000 | 1,491,100,000
Held to maturity securities |  |  |
Amortized Cost | 108,145,000 | 108,145,000 |
Unrealized Losses | (11,927,000) | (11,927,000) |
Total held to maturity, Fair value, | 96,218,000 | 96,218,000 |
Commercial - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 290,614,000 | 290,614,000 | 392,443,000
Unrealized Gains |  |  | 1,741,000
Unrealized Losses | (39,949,000) | (39,949,000) | (6,521,000)
Total available-for-sale securities, Fair value, | 250,665,000 | 250,665,000 | 387,663,000
Held to maturity securities |  |  |
Amortized Cost | 30,500,000 | 30,500,000 |
Unrealized Losses | (4,784,000) | (4,784,000) |
Total held to maturity, Fair value, | 25,716,000 | 25,716,000 |
Commercial - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 142,053,000 | 142,053,000 | 1,415,511,000
Unrealized Gains |  |  | 2,646,000
Unrealized Losses | (10,732,000) | (10,732,000) | (48,714,000)
Total available-for-sale securities, Fair value, | 131,321,000 | 131,321,000 | 1,369,443,000
Held to maturity securities |  |  |
Amortized Cost | 1,159,512,000 | 1,159,512,000 |
Unrealized Losses | (135,284,000) | (135,284,000) |
Total held to maturity, Fair value, | 1,024,228,000 | 1,024,228,000 |
Commercial - Non -agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 21,960,000 | 21,960,000 |
Unrealized Losses | (290,000) | (290,000) |
Total available-for-sale securities, Fair value, | 21,670,000 | 21,670,000 |
Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 769,161,000 | 769,161,000 | 2,103,187,000
Unrealized Gains |  |  | 7,768,000
Unrealized Losses | (74,948,000) | (74,948,000) | (31,432,000)
Total available-for-sale securities, Fair value, | 694,213,000 | 694,213,000 | 2,079,523,000
Held to maturity securities |  |  |
Amortized Cost | 1,106,231,000 | 1,106,231,000 |
Unrealized Losses | (97,089,000) | (97,089,000) |
Total held to maturity, Fair value, | 1,009,142,000 | 1,009,142,000 |
Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 553,090,000 | 553,090,000 | 2,671,131,000
Unrealized Gains |  |  | 3,608,000
Unrealized Losses | (63,642,000) | (63,642,000) | (53,695,000)
Total available-for-sale securities, Fair value, | 489,448,000 | 489,448,000 | 2,621,044,000
Held to maturity securities |  |  |
Amortized Cost | 1,846,258,000 | 1,846,258,000 |
Unrealized Losses | (178,011,000) | (178,011,000) |
Total held to maturity, Fair value, | 1,668,247,000 | 1,668,247,000 |
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 | 53,733,000 | 53,733,000 |
Unrealized Losses | (7,528,000) | (7,528,000) |
Total held to maturity, Fair value, | $ 46,205,000 | $ 46,205,000 |

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