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Investment Securities - Schedule of Contractual Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Available-for-sale securities    
Due in one year or less, amortized cost $ 47,978 $ 89,578
Due in one to five years, amortized cost 143,352 157,883
Due in five to ten years, amortized cost 80,561 89,125
Due after ten years, amortized cost 27,481 24,674
Amortized Cost 6,635,481 4,725,539
Due in one year or less, fair value 47,915 89,392
Due in one to five years, fair value 141,123 153,325
Due in five to ten years, fair value 79,672 84,240
Due after ten years, fair value 25,257 21,650
Fair Value 6,236,263 4,141,482
Held-to-maturity securities    
Held-to-maturity securities, due in one year or less, amortized cost 47,030 18,929
Held-to-maturity securities, due in one to five years, amortized cost 76,452 110,897
Held-to-maturity securities, due in five to ten years, amortized cost 67,195 71,846
Held-to-maturity securities, due after ten years, amortized cost 302,153 329,734
Amortized Cost 3,344,165 3,613,720
Less: Allowance for credit losses (260) (457)
Held-to-maturity securities, net of allowance for credit losses 3,343,905 3,613,263
Held-to-maturity securities, due in one year or less, fair value 46,630 18,658
Held-to-maturity securities, due in one to five years, fair value 76,366 108,056
Held-to-maturity securities, due in five to ten years, fair value 63,882 70,277
Held-to-maturity securities, due after ten years, fair value 246,728 258,379
Fair Value 2,785,147 2,910,550
Mortgage-backed    
Available-for-sale securities    
Mortgage-backed, without single maturity date, amortized cost 6,336,109 4,364,279
Mortgage-backed, without single maturity date, fair value 5,942,296 3,792,875
Held-to-maturity securities    
Mortgage-backed, amortized cost 2,851,335 3,082,314
Mortgage-backed, fair value $ 2,351,541 $ 2,455,180