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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost $ 2,738,293 $ 2,025,483
Gross Unrealized Gains 16,865 1,187
Gross Unrealized Losses (100,123) (164,400)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,655,035 1,862,270
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 1,075,102 929,192
Gross Unrealized Gains 11,186 2,635
Gross Unrealized Losses (46,474) (72,956)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (145) (257)
Debt Securities, Held-to-maturity, Fair Value 1,039,814 858,871
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 1,074,957 928,935
US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 187,587 290,329
Gross Unrealized Gains 76 69
Gross Unrealized Losses (5,091) (14,358)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 182,572 276,040
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 626,900 492,896
Gross Unrealized Gains 3,914 12
Gross Unrealized Losses (58,109) (83,711)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 572,705 409,197
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 920,199 759,059
Gross Unrealized Gains 10,861 2,366
Gross Unrealized Losses (39,849) (60,351)
Debt Securities, Held-to-maturity, Fair Value 891,211 701,074
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 1,733,003 1,090,495
Gross Unrealized Gains 12,638 1,072
Gross Unrealized Losses (36,330) (64,173)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 1,709,311 1,027,394
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 43,839 47,912
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3,199) (5,004)
Debt Securities, Held-to-maturity, Fair Value 40,640 42,908
US Treasury Bill Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 19,448 21,198
Gross Unrealized Gains 109 0
Gross Unrealized Losses (94) (452)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 19,463 20,746
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost 171,355 130,565
Gross Unrealized Gains 128 34
Gross Unrealized Losses (499) (1,706)
Debt Securities, Available-for-Sale, Excluding Accrued Interest 170,984 128,893
Debt Securities, Held-to-maturity [Abstract]    
Amortized Cost 111,064 122,221
Gross Unrealized Gains 325 269
Gross Unrealized Losses (3,426) (7,601)
Debt Securities, Held-to-maturity, Fair Value $ 107,963 $ 114,889