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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Securities, held-to-maturity, Amortized Cost $ 73,101   $ 74,010      
Securities held-to-maturity, Allowance for credit losses (1,089) $ (1,084) (1,087) $ (1,079) $ (1,087) $ (1,100)
Securities held-to-maturity 72,012   72,923      
Securities held-to-maturity, Fair Value 61,070   65,755      
Securities held-to-maturity, Gross Unrecognized Losses (12,031)   (8,255)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 1,636,359   956,418      
Securities, available-for-sale, Unallocated portfolio layer basis adjustments (5,195)   (2,254)      
Securities available-for-sale 1,631,164   954,164      
Securities, available-for-sale, Fair Value 1,548,611   874,753      
Securities available for sale, Gross Unrealized Gains 2,314   1,355      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (90,062)   (83,020)      
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments 5,195   2,254      
Securities available for sale, Gross Unrealized Losses 84,867   80,766      
Total Other Securities [Member]            
Securities, held-to-maturity, Amortized Cost 65,255   66,155      
Securities held-to-maturity, Fair Value 54,153   58,697      
Securities held-to-maturity, Gross Unrecognized Losses (11,102)   (7,458)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 696,553   538,429      
Securities, available-for-sale, Fair Value 679,117   520,409      
Securities available for sale, Gross Unrealized Gains 2,029   1,338      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (19,465)   (19,358)      
US States and Political Subdivisions Debt Securities [Member]            
Securities, held-to-maturity, Amortized Cost 65,255   66,155      
Securities held-to-maturity, Fair Value 54,153   58,697      
Securities held-to-maturity, Gross Unrecognized Losses (11,102)   (7,458)      
US Government Agencies Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 31,073   82,548      
Securities, available-for-sale, Fair Value 30,678   81,734      
Securities available for sale, Gross Unrealized Gains 122   123      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (517)   (937)      
Corporate Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 177,234   173,184      
Securities, available-for-sale, Fair Value 158,759   155,449      
Securities available for sale, Gross Unrealized Gains 24          
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (18,499)   (17,735)      
Mutual Fund Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 11,655   11,660      
Securities, available-for-sale, Fair Value 11,655   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 475,134   269,600      
Securities, available-for-sale, Fair Value 476,568   270,129      
Securities available for sale, Gross Unrealized Gains 1,883   1,215      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (449)   (686)      
Other Debt Obligations            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 1,457   1,437      
Securities, available-for-sale, Fair Value 1,457   1,437      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments     0      
Collateralized Mortgage Backed Securities            
Securities, held-to-maturity, Amortized Cost 7,846   7,855      
Securities held-to-maturity, Fair Value 6,917   7,058      
Securities held-to-maturity, Gross Unrecognized Losses (929)   (797)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 939,806   417,989      
Securities, available-for-sale, Fair Value 869,494   354,344      
Securities available for sale, Gross Unrealized Gains 285   17      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (70,597)   (63,662)      
REMIC and CMO [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 678,425   160,165      
Securities, available-for-sale, Fair Value 649,262   133,574      
Securities available for sale, Gross Unrealized Gains 280          
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (29,443)   (26,591)      
GNMA [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 26,250   12,402      
Securities, available-for-sale, Fair Value 24,248   10,665      
Securities available for sale, Gross Unrealized Gains 1   3      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (2,003)   (1,740)      
FNMA [Member]            
Securities, held-to-maturity, Amortized Cost 7,846   7,855      
Securities held-to-maturity, Fair Value 6,917   7,058      
Securities held-to-maturity, Gross Unrecognized Losses (929)   (797)      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 148,928   155,995      
Securities, available-for-sale, Fair Value 125,740   135,074      
Securities available for sale, Gross Unrealized Gains 4   14      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments (23,192)   (20,935)      
FHLMC [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 86,203   89,427      
Securities, available-for-sale, Fair Value 70,244   75,031      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments $ (15,959)   $ (14,396)