Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 39,835
Due after one year through five years	67,482
Due after five years through ten years	170,995
Total amortized cost, before mortgage-backed securities	278,312
Mortgage-backed securities	1,660,647
Securities Available for Sale, Amortized Cost	1,938,959	$ 1,842,444
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	39,955
Due after one year through five years	67,743
Due after five years through ten years	169,284
Total fair value, before mortgage-backed securities	276,982
Mortgage-backed securities	1,664,642
Total	1,941,624	1,876,830
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	0
Due after one year through five years	30,995
Due after five years through ten years	0
Total amortized cost, before mortgage-backed securities	30,995
Mortgage-backed securities	1,103,828
Securities Held to Maturity, Amortized Cost	1,134,823	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	30,754
Due after five years through ten years	0
Total fair value, before mortgage-backed securities	30,754
Mortgage-backed securities	1,066,122
Total	$ 1,096,876	$ 1,180,569

Amortized cost held to maturity before mortgage backed 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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