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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