Investment Securities - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investment securities available-for-sale:
Less than twelve months, estimated fair value	$ 82,959	$ 117,451
Less than twelve months, unrealized losses	514	1,343
Twelve months or longer, estimated fair value	469,963	587,823
Twelve months or longer, unrealized losses	44,136	68,879
Total, estimated fair value	552,922	705,274
Total, unrealized losses	44,650	70,222
Total temporarily impaired investment securities
Less than twelve months, estimated fair value	82,959	117,451
Less than twelve months, unrealized losses	514	1,343
Twelve months or longer, estimated fair value	469,963	587,823
Twelve months or longer, unrealized losses	44,136	68,879
Total, estimated fair value	552,922	705,274
Total, unrealized losses	44,650	70,222
GSE debentures
Investment securities available-for-sale:
Less than twelve months, estimated fair value	32	30,753
Less than twelve months, unrealized losses	1	281
Twelve months or longer, estimated fair value	103,884	107,750
Twelve months or longer, unrealized losses	12,283	18,749
Total, estimated fair value	103,916	138,503
Total, unrealized losses	12,284	19,030
GSE CMOs
Investment securities available-for-sale:
Less than twelve months, estimated fair value	68,184	4,664
Less than twelve months, unrealized losses	460	107
Twelve months or longer, estimated fair value	45,145	50,334
Twelve months or longer, unrealized losses	6,200	6,921
Total, estimated fair value	113,329	54,998
Total, unrealized losses	6,660	7,028
GSE MBSs
Investment securities available-for-sale:
Less than twelve months, estimated fair value	79	11,128
Less than twelve months, unrealized losses	1	596
Twelve months or longer, estimated fair value	114,594	131,481
Twelve months or longer, unrealized losses	11,739	18,025
Total, estimated fair value	114,673	142,609
Total, unrealized losses	11,740	18,621
Municipal obligations
Investment securities available-for-sale:
Less than twelve months, estimated fair value	9,721	3,616
Less than twelve months, unrealized losses	11	74
Twelve months or longer, estimated fair value	391	3,568
Twelve months or longer, unrealized losses	2	217
Total, estimated fair value	10,112	7,184
Total, unrealized losses	13	291
Corporate debt obligations
Investment securities available-for-sale:
Less than twelve months, estimated fair value	4,943	0
Less than twelve months, unrealized losses	41	0
Twelve months or longer, estimated fair value	2,666	2,550
Twelve months or longer, unrealized losses	8	78
Total, estimated fair value	7,609	2,550
Total, unrealized losses	49	78
U.S. Treasury bonds
Investment securities available-for-sale:
Less than twelve months, estimated fair value	0	67,290
Less than twelve months, unrealized losses	0	285
Twelve months or longer, estimated fair value	203,283	291,641
Twelve months or longer, unrealized losses	13,904	24,888
Total, estimated fair value	203,283	358,931
Total, unrealized losses	13,904	25,173
Foreign government obligations
Investment securities available-for-sale:
Less than twelve months, estimated fair value	0	0
Less than twelve months, unrealized losses	0	0
Twelve months or longer, estimated fair value	0	499
Twelve months or longer, unrealized losses	0	1
Total, estimated fair value	0	499
Total, unrealized losses	$ 0	$ 1