Investment Securities - Securities Held-to-Maturity (Details) - USD ($) $ in Thousands		Mar. 31, 2026		Dec. 31, 2025		Dec. 31, 2024
Investment Securities [Abstract]
Amortized cost		$ 708,273		$ 718,641
Gross unrecognized gains		975		1,099
Gross unrecognized losses		127,734		127,004
Fair value		581,514		592,736
Allowance for credit losses		450		450		$ 450
Mortgage-backed Securities [Member]
Investment Securities [Abstract]
Amortized cost	[1]	577,812		586,001
Gross unrecognized gains	[1]	48		88
Gross unrecognized losses	[1]	116,105		115,773
Fair value	[1]	461,755		470,316
Allowance for credit losses		0	[1]	0	[1]	0
Collateralized Mortgage Obligations [Member]
Investment Securities [Abstract]
Amortized cost	[1]	60,972		62,476
Gross unrecognized gains	[1]	0		0
Gross unrecognized losses	[1]	10,576		10,234
Fair value	[1]	50,396		52,242
Allowance for credit losses		0	[1]	0	[1]	0
Municipal Securities [Member]
Investment Securities [Abstract]
Amortized cost		69,489		70,164
Gross unrecognized gains		927		1,011
Gross unrecognized losses		1,053		997
Fair value		69,363		70,178
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.