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Investment Securities - Amortized Cost and Estimated Fair Values of Investment Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Held to Maturity
Amortized Cost	$ 393,696	$ 414,926
Gross Unrealized Gains	142	290
Gross Unrealized Losses	37,448	37,100
Estimated Fair Value	356,390	378,116
Allowance for Credit Losses	81	99	$ 178	$ 203
U.S. Treasury and government agency securities
Held to Maturity
Amortized Cost	92,514	104,836
Gross Unrealized Gains	0	2
Gross Unrealized Losses	4,503	4,513
Estimated Fair Value	88,011	100,325
Allowance for Credit Losses	0	0
Mortgage-backed securities
Held to Maturity
Amortized Cost	294,223	303,129
Gross Unrealized Gains	123	255
Gross Unrealized Losses	32,526	32,167
Estimated Fair Value	261,820	271,217
Allowance for Credit Losses	0	0
Other debt securities
Held to Maturity
Amortized Cost	6,959	6,961
Gross Unrealized Gains	19	33
Gross Unrealized Losses	419	420
Estimated Fair Value	6,559	6,574
Allowance for Credit Losses	$ 81	$ 99

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Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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