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Investment Securities - Contractual Maturities of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year	$ 987
Due after one year through five years	224,894
Due after five years through ten years	235,455
Due after ten years	288,022
Residential mortgage-backed securities	3,541,284
Amortized Cost	4,290,642	$ 3,552,273
Fair Value
Due in one year	981
Due after one year through five years	222,934
Due after five years through ten years	228,609
Due after ten years	235,616
Residential mortgage-backed securities	3,514,078
Fair Value	$ 4,202,218	$ 3,369,724

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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