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Investment Securities - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Investment securities available-for-sale:    
Less than twelve months, estimated fair value $ 318,234 $ 117,451
Less than twelve months, unrealized losses 1,570 1,343
Twelve months or longer, estimated fair value 507,358 587,823
Twelve months or longer, unrealized losses 47,669 68,879
Debt securities, available-for-sale, unrealized loss position 825,592 705,274
Total, unrealized losses 49,239 70,222
Total temporarily impaired investment securities    
Less than twelve months, estimated fair value 318,234 117,451
Less than twelve months, unrealized losses 1,570 1,343
Twelve months or longer, estimated fair value 507,358 587,823
Twelve months or longer, unrealized losses 47,669 68,879
Total, estimated fair value 825,592 705,274
Total, unrealized losses 49,239 70,222
GSE debentures    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 150,401 30,753
Less than twelve months, unrealized losses 656 281
Twelve months or longer, estimated fair value 106,262 107,750
Twelve months or longer, unrealized losses 13,231 18,749
Debt securities, available-for-sale, unrealized loss position 256,663 138,503
Total, unrealized losses 13,887 19,030
GSE CMOs    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 56,878 4,664
Less than twelve months, unrealized losses 302 107
Twelve months or longer, estimated fair value 45,998 50,334
Twelve months or longer, unrealized losses 6,354 6,921
Debt securities, available-for-sale, unrealized loss position 102,876 54,998
Total, unrealized losses 6,656 7,028
GSE MBSs    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 77,899 11,128
Less than twelve months, unrealized losses 259 596
Twelve months or longer, estimated fair value 102,133 131,481
Twelve months or longer, unrealized losses 12,385 18,025
Debt securities, available-for-sale, unrealized loss position 180,032 142,609
Total, unrealized losses 12,644 18,621
Municipal obligations    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 15,038 3,616
Less than twelve months, unrealized losses 162 74
Twelve months or longer, estimated fair value 3,735 3,568
Twelve months or longer, unrealized losses 40 217
Debt securities, available-for-sale, unrealized loss position 18,773 7,184
Total, unrealized losses 202 291
Corporate debt obligations    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 8,065 0
Less than twelve months, unrealized losses 189 0
Twelve months or longer, estimated fair value 2,515 2,550
Twelve months or longer, unrealized losses 147 78
Debt securities, available-for-sale, unrealized loss position 10,580 2,550
Total, unrealized losses 336 78
U.S. Treasury bonds    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value 9,953 67,290
Less than twelve months, unrealized losses 2 285
Twelve months or longer, estimated fair value 246,715 291,641
Twelve months or longer, unrealized losses 15,512 24,888
Debt securities, available-for-sale, unrealized loss position 256,668 358,931
Total, unrealized losses $ 15,514 25,173
Foreign government obligations    
Investment securities available-for-sale:    
Less than twelve months, estimated fair value   0
Less than twelve months, unrealized losses   0
Twelve months or longer, estimated fair value   499
Twelve months or longer, unrealized losses   1
Debt securities, available-for-sale, unrealized loss position   499
Total, unrealized losses   $ 1