Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 40,950
Due after one year through five years	48,844
Due after five years through ten years	201,288
Total amortized cost, before mortgage-backed securities	291,082
Mortgage-backed securities	1,605,053
Securities Available for Sale, Amortized Cost	1,896,135	$ 1,842,444
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	41,130
Due after one year through five years	49,423
Due after five years through ten years	201,435
Total fair value, before mortgage-backed securities	291,988
Mortgage-backed securities	1,621,847
Total	1,913,835	1,876,830
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	0
Due after one year through five years	30,804
Due after five years through ten years	0
Total amortized cost, before mortgage-backed securities	30,804
Mortgage-backed securities	1,128,872
Securities Held to Maturity, Amortized Cost	1,159,676	1,207,454
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	0
Due after one year through five years	30,752
Due after five years through ten years	0
Total fair value, before mortgage-backed securities	30,752
Mortgage-backed securities	1,096,324
Total	$ 1,127,076	$ 1,180,569

Amortized cost held to maturity before mortgage backed securities.

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Available for sale debt securities amortized cost before mortgage backed securities.

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Fair value of available for sale securities before mortgage back securities.

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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).

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next 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).

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in next 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/2003/role/disclosureRef
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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.

+ References

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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