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Investment Securities - Contractual Maturities of Investments Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year	$ 49,575
Due after one year through five years	33,202
Due after five years through ten years	156,014
Due after ten years	525,028
Residential mortgage-backed securities	2,732,752
Amortized Cost	3,496,571	$ 3,532,220
Fair Value
Due in one year	49,361
Due after one year through five years	33,124
Due after five years through ten years	150,240
Due after ten years	464,891
Residential mortgage-backed securities	2,431,987
Total	$ 3,129,603	$ 3,028,284

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