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Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of AFS and HTM Securities
The amortized cost, gross unrealized gains and losses and fair value of debt securities AFS and HTM at September 30, 2025 and December 31, 2024 are summarized as follows:
 September 30, 2025
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
AFS Debt Securities   
U.S. Treasury securities and obligations of U.S. government agencies$41,205 $346 $(432)$41,119 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities2,654,711 28,944 (141,197)2,542,458 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities299,739 4,478 (6,471)297,746 
Private mortgage-backed securities and collateralized mortgage obligations103,825 348 (5,582)98,591 
CLOs216,818 698 (309)217,207 
Obligations of state and political subdivisions8,635 1 (1,142)7,494 
Other debt securities7,389 76 — 7,465 
Totals$3,332,322 $34,891 $(155,133)$3,212,080 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$511,031 $— $(93,719)$417,312 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,573 — (6,501)81,072 
Totals$598,604 $— $(100,220)$498,384 
 December 31, 2024
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
AFS Debt Securities    
U.S. Treasury securities and obligations of U.S. government agencies$28,233 $29 $(522)$27,740 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,777,274 1,237 (190,536)1,587,975 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities206,537 1,195 (10,283)197,449 
Private mortgage-backed securities and collateralized mortgage obligations129,475 149 (8,382)121,242 
CLOs278,342 788 (166)278,964 
Obligations of state and political subdivisions7,139 — (1,449)5,690 
Other debt securities7,389 94 — 7,483 
Totals$2,434,389 $3,492 $(211,338)$2,226,543 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$546,444 $— $(117,620)$428,824 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities88,742 — (9,972)78,770 
Totals$635,186 $— $(127,592)$507,594 
Schedule of Amortized Cost and Fair Value of Held-to-Maturity Securities
The amortized cost, gross unrealized gains and losses and fair value of debt securities AFS and HTM at September 30, 2025 and December 31, 2024 are summarized as follows:
 September 30, 2025
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
AFS Debt Securities   
U.S. Treasury securities and obligations of U.S. government agencies$41,205 $346 $(432)$41,119 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities2,654,711 28,944 (141,197)2,542,458 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities299,739 4,478 (6,471)297,746 
Private mortgage-backed securities and collateralized mortgage obligations103,825 348 (5,582)98,591 
CLOs216,818 698 (309)217,207 
Obligations of state and political subdivisions8,635 1 (1,142)7,494 
Other debt securities7,389 76 — 7,465 
Totals$3,332,322 $34,891 $(155,133)$3,212,080 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$511,031 $— $(93,719)$417,312 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,573 — (6,501)81,072 
Totals$598,604 $— $(100,220)$498,384 
 December 31, 2024
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
AFS Debt Securities    
U.S. Treasury securities and obligations of U.S. government agencies$28,233 $29 $(522)$27,740 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,777,274 1,237 (190,536)1,587,975 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities206,537 1,195 (10,283)197,449 
Private mortgage-backed securities and collateralized mortgage obligations129,475 149 (8,382)121,242 
CLOs278,342 788 (166)278,964 
Obligations of state and political subdivisions7,139 — (1,449)5,690 
Other debt securities7,389 94 — 7,483 
Totals$2,434,389 $3,492 $(211,338)$2,226,543 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$546,444 $— $(117,620)$428,824 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities88,742 — (9,972)78,770 
Totals$635,186 $— $(127,592)$507,594 
Schedule of Investments Classified by Contractual Maturity
The amortized cost and fair value of securities HTM and AFS as of September 30, 2025, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $14,004 $14,010 
Due after one year through five years— — 11,272 11,262 
Due after five years through ten years— — 8,321 8,598 
Due after ten years— — 16,243 14,743 
 — — 49,840 48,613 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities511,031 417,312 2,654,711 2,542,458 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,573 81,072 299,739 297,746 
Private mortgage-backed securities and collateralized mortgage obligations— — 103,825 98,591 
CLOs— — 216,818 217,207 
Other debt securities— — 7,389 7,465 
Totals$598,604 $498,384 $3,332,322 $3,212,080 
Schedule of Debt Securities in Unrealized Loss Position The tables below indicate the fair value of AFS debt securities with unrealized losses for which no allowance for credit losses has been recorded.
 September 30, 2025
 Less Than 12 Months12 Months or Longer
Total1
(In thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Treasury securities and obligations of U.S. government agencies$313 $(2)$14,493 $(430)$14,806 $(432)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities175,515 (2,115)786,425 (139,082)961,940 (141,197)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities274 — 95,067 (6,471)95,341 (6,471)
Private mortgage-backed securities and collateralized mortgage obligations— — 81,657 (5,582)81,657 (5,582)
CLOs45,106 (132)44,532 (177)89,638 (309)
Obligations of state and political subdivisions— — 5,663 (1,142)5,663 (1,142)
Totals$221,208 $(2,249)$1,027,837 $(152,884)$1,249,045 $(155,133)
1Comprised of 337 individual securities.
 December 31, 2024
 Less Than 12 Months12 Months or Longer
Total1
(In thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. Treasury securities and obligations of U.S. government agencies$4,825 $(13)$18,060 $(509)$22,885 $(522)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities648,967 (7,578)739,363 (182,958)1,388,330 (190,536)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities13,200 (222)107,041 (10,061)120,241 (10,283)
Private mortgage-backed securities and collateralized mortgage obligations7,178 (16)101,242 (8,366)108,420 (8,382)
CLOs43,410 (152)7,596 (14)51,006 (166)
Obligations of state and political subdivisions319 (15)5,371 (1,434)5,690 (1,449)
Totals$717,899 $(7,996)$978,673 $(203,342)$1,696,572 $(211,338)
1Comprised of 377 individual securities.