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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Available for sale debt securities |  |
Amortized Cost | $ 3,296,825,000 | $ 3,549,599,000
Unrealized Gains |  | 50,000
Unrealized Losses | (387,453,000) | (398,516,000)
Total available-for-sale securities, Fair value, | 2,909,372,000 | 3,151,133,000
Held to maturity securities |  |
Amortized Cost | 4,180,408,000 | 4,320,639,000
Unrealized Gains | 196,000 |
Unrealized Losses | (483,343,000) | (505,817,000)
Total held to maturity, Fair value, | 3,697,261,000 | 3,814,822,000
Available-for-sale investment securities |  |
Accrued interest receivable related to available-for-sale investment securities | 8,700,000 | 8,900,000
Accrued interest receivable related to held to maturity investment securities | 7,200,000 | 7,500,000
Reclassification of available for sale securities to held to maturity | 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 | 249,877,000
Unrealized Gains |  | 50,000
Unrealized Losses | (9,275,000) | (8,606,000)
Total available-for-sale securities, Fair value, | 240,614,000 | 241,321,000
U.S. Treasury and government agency debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 128,594,000 | 163,309,000
Unrealized Losses | (11,709,000) | (12,327,000)
Total available-for-sale securities, Fair value, | 116,885,000 | 150,982,000
Held to maturity securities |  |
Amortized Cost | 53,189,000 | 54,318,000
Unrealized Losses | (5,675,000) | (5,674,000)
Total held to maturity, Fair value, | 47,514,000 | 48,644,000
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 45,000,000 | 45,000,000
Unrealized Losses | (760,000) | (699,000)
Total available-for-sale securities, Fair value, | 44,240,000 | 44,301,000
Residential - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 63,486,000 | 66,792,000
Unrealized Losses | (6,284,000) | (7,069,000)
Total available-for-sale securities, Fair value, | 57,202,000 | 59,723,000
Held to maturity securities |  |
Amortized Cost | 45,097,000 | 46,302,000
Unrealized Losses | (5,484,000) | (6,294,000)
Total held to maturity, Fair value, | 39,613,000 | 40,008,000
Residential - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 1,229,375,000 | 1,317,718,000
Unrealized Losses | (146,383,000) | (157,263,000)
Total available-for-sale securities, Fair value, | 1,082,992,000 | 1,160,455,000
Held to maturity securities |  |
Amortized Cost | 102,940,000 | 106,534,000
Unrealized Losses | (11,898,000) | (12,978,000)
Total held to maturity, Fair value, | 91,042,000 | 93,556,000
Commercial - Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 276,365,000 | 282,700,000
Unrealized Losses | (50,903,000) | (44,847,000)
Total available-for-sale securities, Fair value, | 225,462,000 | 237,853,000
Held to maturity securities |  |
Amortized Cost | 30,675,000 | 30,544,000
Unrealized Losses | (6,381,000) | (5,229,000)
Total held to maturity, Fair value, | 24,294,000 | 25,315,000
Commercial - Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 96,441,000 | 130,612,000
Unrealized Losses | (8,544,000) | (11,039,000)
Total available-for-sale securities, Fair value, | 87,897,000 | 119,573,000
Held to maturity securities |  |
Amortized Cost | 1,137,157,000 | 1,150,449,000
Unrealized Gains | 196,000 |
Unrealized Losses | (129,963,000) | (138,451,000)
Total held to maturity, Fair value, | 1,007,390,000 | 1,011,998,000
Commercial - Non -agency |  |
Available for sale debt securities |  |
Amortized Cost | 21,964,000 | 21,964,000
Unrealized Losses | (585,000) | (493,000)
Total available-for-sale securities, Fair value, | 21,379,000 | 21,471,000
Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 688,844,000 | 738,524,000
Unrealized Losses | (83,623,000) | (85,202,000)
Total available-for-sale securities, Fair value, | 605,221,000 | 653,322,000
Held to maturity securities |  |
Amortized Cost | 1,036,671,000 | 1,080,492,000
Unrealized Losses | (119,506,000) | (122,378,000)
Total held to maturity, Fair value, | 917,165,000 | 958,114,000
Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 496,867,000 | 533,103,000
Unrealized Losses | (69,387,000) | (70,971,000)
Total available-for-sale securities, Fair value, | 427,480,000 | 462,132,000
Held to maturity securities |  |
Amortized Cost | 1,720,672,000 | 1,798,178,000
Unrealized Losses | (198,450,000) | (207,045,000)
Total held to maturity, Fair value, | 1,522,222,000 | 1,591,133,000
Debt securities issued by states and political subdivisions |  |
Held to maturity securities |  |
Amortized Cost | 54,007,000 | 53,822,000
Unrealized Losses | (5,986,000) | (7,768,000)
Total held to maturity, Fair value, | $ 48,021,000 | $ 46,054,000

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