Investment Securities - Book Values, Estimated Fair Values and Unrealized Gains and Losses of Investments Classified as Held-To-Maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
Investment Securities [Abstract]
Amortized cost		$ 718,641		$ 769,443
Gross unrecognized gains		1,099		46
Gross unrecognized losses		127,004		158,536
Fair value		592,736		610,953
Allowance for credit losses		450		450		$ 450
Mortgage-backed Securities [Member]
Investment Securities [Abstract]
Amortized cost	[1]	586,001		626,427
Gross unrecognized gains	[1]	88		0
Gross unrecognized losses	[1]	115,773		143,544
Fair value	[1]	470,316		482,883
Allowance for credit losses		0	[1]	0	[1]	0
Collateralized Mortgage Obligations [Member]
Investment Securities [Abstract]
Amortized cost	[1]	62,476		68,377
Gross unrecognized gains	[1]	0		0
Gross unrecognized losses	[1]	10,234		13,876
Fair value	[1]	52,242		54,501
Allowance for credit losses		0	[1]	0	[1]	0
Municipal Securities [Member]
Investment Securities [Abstract]
Amortized cost		70,164		74,639
Gross unrecognized gains		1,011		46
Gross unrecognized losses		997		1,116
Fair value		70,178		73,569
Allowance for credit losses		$ 450		$ 450		$ 450

[1] All mortgage-backed securities and collateralized mortgage obligations were issued by an agency or government sponsored entity of the U.S. Government.