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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Available for sale debt securities |  |  |
Amortized Cost | $ 3,172,031,000 | $ 3,172,031,000 | $ 3,549,599,000
Unrealized Gains | 21,000 | 21,000 | 50,000
Unrealized Losses | (449,348,000) | (449,348,000) | (398,516,000)
Total available-for-sale securities, Fair value, | 2,722,704,000 | 2,722,704,000 | 3,151,133,000
Held to maturity securities |  |  |
Amortized Cost | 4,104,114,000 | 4,104,114,000 | 4,320,639,000
Unrealized Gains | 153,000 | 153,000 |
Unrealized Losses | (671,238,000) | (671,238,000) | (505,817,000)
Total held to maturity, Fair value, | 3,433,029,000 | 3,433,029,000 | 3,814,822,000
Available-for-sale investment securities |  |  |
Accrued interest receivable related to available-for-sale investment securities | 8,700,000 | 8,700,000 | 8,900,000
Accrued interest receivable related to held to maturity investment securities | 7,400,000 | 7,400,000 | 7,500,000
Reclassification of available for sale securities to held to maturity | 0 | 0 | 4,600,000,000
Other comprehensive income (loss), transfer of securities from available for sale to held to maturity |  |  | (372,400,000)
Gains (losses) recognized on reclassification, transfer of securities from available for sale to held to maturity |  |  | 0
Collateralized Loan Obligations |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 249,889,000 | 249,889,000 | 249,877,000
Unrealized Gains | 21,000 | 21,000 | 50,000
Unrealized Losses | (3,788,000) | (3,788,000) | (8,606,000)
Total available-for-sale securities, Fair value, | 246,122,000 | 246,122,000 | 241,321,000
U.S. Treasury and government agency debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 126,264,000 | 126,264,000 | 163,309,000
Unrealized Losses | (12,105,000) | (12,105,000) | (12,327,000)
Total available-for-sale securities, Fair value, | 114,159,000 | 114,159,000 | 150,982,000
Held to maturity securities |  |  |
Amortized Cost | 53,105,000 | 53,105,000 | 54,318,000
Unrealized Losses | (7,901,000) | (7,901,000) | (5,674,000)
Total held to maturity, Fair value, | 45,204,000 | 45,204,000 | 48,644,000
Government-sponsored enterprises debt securities |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 20,000,000 | 20,000,000 | 45,000,000
Unrealized Losses | (740,000) | (740,000) | (699,000)
Total available-for-sale securities, Fair value, | 19,260,000 | 19,260,000 | 44,301,000
Residential - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 61,768,000 | 61,768,000 | 66,792,000
Unrealized Losses | (9,406,000) | (9,406,000) | (7,069,000)
Total available-for-sale securities, Fair value, | 52,362,000 | 52,362,000 | 59,723,000
Held to maturity securities |  |  |
Amortized Cost | 44,379,000 | 44,379,000 | 46,302,000
Unrealized Losses | (8,024,000) | (8,024,000) | (6,294,000)
Total held to maturity, Fair value, | 36,355,000 | 36,355,000 | 40,008,000
Residential - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 1,185,269,000 | 1,185,269,000 | 1,317,718,000
Unrealized Losses | (179,487,000) | (179,487,000) | (157,263,000)
Total available-for-sale securities, Fair value, | 1,005,782,000 | 1,005,782,000 | 1,160,455,000
Held to maturity securities |  |  |
Amortized Cost | 100,905,000 | 100,905,000 | 106,534,000
Unrealized Losses | (18,151,000) | (18,151,000) | (12,978,000)
Total held to maturity, Fair value, | 82,754,000 | 82,754,000 | 93,556,000
Commercial - Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 272,432,000 | 272,432,000 | 282,700,000
Unrealized Losses | (60,535,000) | (60,535,000) | (44,847,000)
Total available-for-sale securities, Fair value, | 211,897,000 | 211,897,000 | 237,853,000
Held to maturity securities |  |  |
Amortized Cost | 30,733,000 | 30,733,000 | 30,544,000
Unrealized Losses | (8,756,000) | (8,756,000) | (5,229,000)
Total held to maturity, Fair value, | 21,977,000 | 21,977,000 | 25,315,000
Commercial - Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 94,021,000 | 94,021,000 | 130,612,000
Unrealized Losses | (9,101,000) | (9,101,000) | (11,039,000)
Total available-for-sale securities, Fair value, | 84,920,000 | 84,920,000 | 119,573,000
Held to maturity securities |  |  |
Amortized Cost | 1,132,818,000 | 1,132,818,000 | 1,150,449,000
Unrealized Gains | 153,000 | 153,000 |
Unrealized Losses | (194,471,000) | (194,471,000) | (138,451,000)
Total held to maturity, Fair value, | 938,500,000 | 938,500,000 | 1,011,998,000
Commercial - Non -agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 21,964,000 | 21,964,000 | 21,964,000
Unrealized Losses | (362,000) | (362,000) | (493,000)
Total available-for-sale securities, Fair value, | 21,602,000 | 21,602,000 | 21,471,000
Government agency |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 661,207,000 | 661,207,000 | 738,524,000
Unrealized Losses | (95,355,000) | (95,355,000) | (85,202,000)
Total available-for-sale securities, Fair value, | 565,852,000 | 565,852,000 | 653,322,000
Held to maturity securities |  |  |
Amortized Cost | 1,010,551,000 | 1,010,551,000 | 1,080,492,000
Unrealized Losses | (153,260,000) | (153,260,000) | (122,378,000)
Total held to maturity, Fair value, | 857,291,000 | 857,291,000 | 958,114,000
Government-sponsored enterprises |  |  |
Available for sale debt securities |  |  |
Amortized Cost | 479,217,000 | 479,217,000 | 533,103,000
Unrealized Losses | (78,469,000) | (78,469,000) | (70,971,000)
Total available-for-sale securities, Fair value, | 400,748,000 | 400,748,000 | 462,132,000
Held to maturity securities |  |  |
Amortized Cost | 1,677,519,000 | 1,677,519,000 | 1,798,178,000
Unrealized Losses | (271,248,000) | (271,248,000) | (207,045,000)
Total held to maturity, Fair value, | 1,406,271,000 | 1,406,271,000 | 1,591,133,000
Debt securities issued by states and political subdivisions |  |  |
Held to maturity securities |  |  |
Amortized Cost | 54,104,000 | 54,104,000 | 53,822,000
Unrealized Losses | (9,427,000) | (9,427,000) | (7,768,000)
Total held to maturity, Fair value, | $ 44,677,000 | $ 44,677,000 | $ 46,054,000

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