v3.26.1
Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Securities Available-for-Sale Securities
The following tables set forth investment securities available-for-sale at the dates indicated:
 At March 31, 2026
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (In Thousands)
Investment securities available-for-sale:
GSE debentures
$191,035 $257 $12,696 $178,596 
GSE CMOs563,834 797 11,050 553,581 
GSE MBSs326,216 2,027 12,119 316,124 
Municipal obligations225,345 3,570 427 228,488 
Corporate debt obligations35,359 760 125 35,994 
U.S. Treasury bonds419,142 876 14,591 405,427 
Foreign government obligations500 — — 500 
Total investment securities available-for-sale$1,761,431 $8,287 $51,008 $1,718,710 
 December 31, 2025
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (In Thousands)
Investment securities available-for-sale:
GSE debentures$185,449 $512 $12,284 $173,677 
GSE CMOs500,446 2,784 6,660 496,570 
GSE MBSs334,476 3,009 11,740 325,745 
Municipal obligations231,924 8,305 13 240,216 
Corporate debt obligations39,209 863 49 40,023 
U.S. Treasury bonds424,214 1,727 13,904 412,037 
Foreign government obligations500 — — 500 
Total investment securities available-for-sale$1,716,218 $17,200 $44,650 $1,688,768 
Schedule of Investment Securities in a Continuous Unrealized Loss Position
Investment securities as of March 31, 2026 and December 31, 2025 that have been in a continuous unrealized loss position for less than twelve months or twelve months or longer are as follows:
 At March 31, 2026
 Less than
Twelve Months		Twelve Months
or Longer		Total
 Estimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses
 (In Thousands)
Investment securities available-for-sale:      
GSE debentures$35,401 $89 $112,099 $12,607 $147,500 $12,696 
GSE CMOs421,535 4,422 48,411 6,628 469,946 11,050 
GSE MBSs8,809 11 122,292 12,108 131,101 12,119 
Municipal obligations29,286 236 7,194 191 36,480 427 
Corporate debt obligations10,025 125 — — 10,025 125 
U.S. Treasury bonds9,813 181 217,385 14,410 227,198 14,591 
Total temporarily impaired investment securities$514,869 $5,064 $507,381 $45,944 $1,022,250 $51,008 
 At December 31, 2025
 Less than
Twelve Months		Twelve Months
or Longer		Total
 Estimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses
 (In Thousands)
Investment securities available-for-sale:      
GSE debentures$32 $1 $103,884 $12,283 $103,916 $12,284 
GSE CMOs68,184 460 45,145 6,200 113,329 6,660 
GSE MBSs79 1 114,594 11,739 114,673 11,740 
Municipal obligations9,721 11 391 2 10,112 13 
Corporate debt obligations4,943 41 2,666 8 7,609 49 
U.S. Treasury bonds— — 203,283 13,904 203,283 13,904 
Total temporarily impaired investment securities$82,959 $514 $469,963 $44,136 $552,922 $44,650 
Schedule of Maturities of the Investments in Debt Securities
The final stated maturities of the debt securities are as follows for the periods indicated:
 At March 31, 2026At December 31, 2025
 Amortized
Cost		Estimated
Fair Value		Weighted
Average
Rate		Amortized
Cost		Estimated
Fair Value		Weighted
Average
Rate
 (Dollars in Thousands)
Investment securities available-for-sale:      
Within 1 year$115,150 $114,990 3.68 %$145,787 $146,092 3.89 %
After 1 year through 5 years504,732 484,744 2.97 %472,284 454,138 2.76 %
After 5 years through 10 years245,821 239,804 3.37 %246,784 242,931 3.56 %
Over 10 years895,728 879,172 4.18 %851,363 845,607 4.18 %
$1,761,431 $1,718,710 3.69 %$1,716,218 $1,688,768 3.69 %