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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Securities, held-to-maturity, Amortized Cost $ 72,786   $ 74,010      
Securities held-to-maturity, Allowance for credit losses (1,086) $ (1,089) (1,087) $ (1,082) $ (1,079) $ (1,100)
Securities held-to-maturity 71,700   72,923      
Securities held-to-maturity, Fair Value 63,952   65,755      
Securities held-to-maturity, Gross Unrecognized Losses (8,834)   (8,255)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 1,677,943   956,418      
Securities, available-for-sale, Unallocated portfolio layer basis adjustments (89)   (2,254)      
Securities available-for-sale 1,677,854   954,164      
Securities, available-for-sale, Fair Value 1,614,249   874,753      
Securities available for sale, Gross Unrealized Gains 6,357   1,355      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (70,051)   (83,020)      
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments 89   2,254      
Securities available for sale, Gross Unrealized Losses 69,962   80,766      
Total Other Securities [Member]            
Securities, held-to-maturity, Amortized Cost 64,945   66,155      
Securities held-to-maturity, Fair Value 56,709   58,697      
Securities held-to-maturity, Gross Unrecognized Losses (8,236)   (7,458)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 700,666   538,429      
Securities, available-for-sale, Fair Value 687,518   520,409      
Securities available for sale, Gross Unrealized Gains 2,176   1,338      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (15,324)   (19,358)      
US States and Political Subdivisions Debt Securities [Member]            
Securities, held-to-maturity, Amortized Cost 64,945   66,155      
Securities held-to-maturity, Fair Value 56,709   58,697      
Securities held-to-maturity, Gross Unrecognized Losses (8,236)   (7,458)      
US Government Agencies Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 30,016   82,548      
Securities, available-for-sale, Fair Value 29,856   81,734      
Securities available for sale, Gross Unrealized Gains 106   123      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (266)   (937)      
Corporate Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 183,281   173,184      
Securities, available-for-sale, Fair Value 169,555   155,449      
Securities available for sale, Gross Unrealized Gains 407          
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (14,133)   (17,735)      
Mutual Fund Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 12,168   11,660      
Securities, available-for-sale, Fair Value 12,168   11,660      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments     0      
Collateralized Debt Obligations [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 473,762   269,600      
Securities, available-for-sale, Fair Value 474,500   270,129      
Securities available for sale, Gross Unrealized Gains 1,663   1,215      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (925)   (686)      
Other Debt Obligations            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 1,439   1,437      
Securities, available-for-sale, Fair Value 1,439   1,437      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments     0      
Collateralized Mortgage Backed Securities            
Securities, held-to-maturity, Amortized Cost 7,841   7,855      
Securities held-to-maturity, Fair Value 7,243   7,058      
Securities held-to-maturity, Gross Unrecognized Losses (598)   (797)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 977,277   417,989      
Securities, available-for-sale, Fair Value 926,731   354,344      
Securities available for sale, Gross Unrealized Gains 4,181   17      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (54,727)   (63,662)      
REMIC and CMO [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 723,583   160,165      
Securities, available-for-sale, Fair Value 704,494   133,574      
Securities available for sale, Gross Unrealized Gains 4,055          
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (23,144)   (26,591)      
GNMA [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 23,686   12,402      
Securities, available-for-sale, Fair Value 22,254   10,665      
Securities available for sale, Gross Unrealized Gains 85   3      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (1,517)   (1,740)      
FNMA [Member]            
Securities, held-to-maturity, Amortized Cost 7,841   7,855      
Securities held-to-maturity, Fair Value 7,243   7,058      
Securities held-to-maturity, Gross Unrecognized Losses (598)   (797)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 145,547   155,995      
Securities, available-for-sale, Fair Value 128,047   135,074      
Securities available for sale, Gross Unrealized Gains 41   14      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (17,541)   (20,935)      
FHLMC [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 84,461   89,427      
Securities, available-for-sale, Fair Value 71,936   75,031      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments $ (12,525)   $ (14,396)