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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
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 September 30, 2025
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (In Thousands)
Investment securities available-for-sale:
GSE debentures
$341,753 $485 $13,887 $328,351 
GSE CMOs343,654 2,703 6,656 339,701 
GSE MBSs343,731 1,307 12,644 332,394 
Municipal obligations230,685 4,951 202 235,434 
Corporate debt obligations48,178 413 336 48,255 
U.S. Treasury bonds468,718 1,584 15,514 454,788 
Foreign government obligations500 — — 500 
Total investment securities available-for-sale1,777,219 11,443 $49,239 1,739,423 
 December 31, 2024
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (In Thousands)
Investment securities available-for-sale:
GSE debentures$195,099 $225 $19,030 $176,294 
GSE CMOs62,567 4 7,028 55,543 
GSE MBSs166,843 63 18,621 148,285 
Municipal obligations20,526 19 291 20,254 
Corporate debt obligations12,140 225 78 12,287 
U.S. Treasury bonds506,714 331 25,173 481,872 
Foreign government obligations500 — 1 499 
Total investment securities available-for-sale$964,389 $867 $70,222 $895,034 
Schedule of Investment Securities in a Continuous Unrealized Loss Position
Investment securities as of September 30, 2025 and December 31, 2024 that have been in a continuous unrealized loss position for less than twelve months or twelve months or longer are as follows:
 At September 30, 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$150,401 $656 $106,262 $13,231 $256,663 $13,887 
GSE CMOs56,878 302 45,998 6,354 102,876 6,656 
GSE MBSs77,899 259 102,133 12,385 180,032 12,644 
Municipal obligations15,038 162 3,735 40 18,773 202 
Corporate debt obligations8,065 189 2,515 147 10,580 336 
U.S. Treasury bonds9,953 2 246,715 15,512 256,668 15,514 
Temporarily impaired investment securities available-for-sale318,234 1,570 507,358 47,669 825,592 49,239 
Total temporarily impaired investment securities$318,234 $1,570 $507,358 $47,669 $825,592 $49,239 
 At December 31, 2024
 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$30,753 $281 $107,750 $18,749 $138,503 $19,030 
GSE CMOs4,664 107 50,334 6,921 54,998 7,028 
GSE MBSs11,128 596 131,481 18,025 142,609 18,621 
Municipal obligations3,616 74 3,568 217 7,184 291 
Corporate debt obligations— — 2,550 78 2,550 78 
U.S. Treasury bonds67,290 285 291,641 24,888 358,931 25,173 
Foreign government obligations— — 499 1 499 1 
Temporarily impaired investment securities available-for-sale117,451 1,343 587,823 68,879 705,274 70,222 
Total temporarily impaired investment securities$117,451 $1,343 $587,823 $68,879 $705,274 $70,222 
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 September 30, 2025At December 31, 2024
 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$169,460 $169,303 3.14 %$103,337 $102,457 3.22 %
After 1 year through 5 years482,450 463,265 2.79 %449,289 434,608 3.32 %
After 5 years through 10 years262,308 255,087 2.70 %207,980 180,370 1.77 %
Over 10 years863,001 851,768 2.41 %203,783 177,599 3.13 %
$1,777,219 $1,739,423 2.62 %$964,389 $895,034 2.96 %