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Securities (Tables)
 6 Months Ended
Jun. 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 securities AFS and HTM at June 30, 2025 and December 31, 2024 are summarized as follows:
 June 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$25,237 $219 $(377)$25,079 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities2,338,389 12,783 (157,623)2,193,549 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities272,432 3,760 (7,140)269,052 
Private mortgage-backed securities and collateralized mortgage obligations113,420 281 (6,289)107,412 
CLOs257,962 540 (597)257,905 
Obligations of state and political subdivisions7,141 — (1,400)5,741 
Other debt securities7,389 58 — 7,447 
Totals$3,021,970 $17,641 $(173,426)$2,866,185 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$525,437 $— $(102,879)$422,558 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,875 — (7,246)80,629 
Totals$613,312 $— $(110,125)$503,187 
 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 securities AFS and HTM at June 30, 2025 and December 31, 2024 are summarized as follows:
 June 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$25,237 $219 $(377)$25,079 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities2,338,389 12,783 (157,623)2,193,549 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities272,432 3,760 (7,140)269,052 
Private mortgage-backed securities and collateralized mortgage obligations113,420 281 (6,289)107,412 
CLOs257,962 540 (597)257,905 
Obligations of state and political subdivisions7,141 — (1,400)5,741 
Other debt securities7,389 58 — 7,447 
Totals$3,021,970 $17,641 $(173,426)$2,866,185 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$525,437 $— $(102,879)$422,558 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,875 — (7,246)80,629 
Totals$613,312 $— $(110,125)$503,187 
 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)$507,594 
Schedule of Investments Classified by Contractual Maturity
The amortized cost and fair value of securities HTM and AFS as of June 30, 2025, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $103 $101 
Due after one year through five years— — 6,085 6,101 
Due after five years through ten years— — 9,584 9,708 
Due after ten years— — 16,606 14,910 
 — — 32,378 30,820 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities525,437 422,558 2,338,389 2,193,549 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,875 80,629 272,432 269,052 
Private mortgage-backed securities and collateralized mortgage obligations— — 113,420 107,412 
CLOs— — 257,962 257,905 
Other debt securities— — 7,389 7,447 
Totals$613,312 $503,187 $3,021,970 $2,866,185 
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.
 June 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$373 $(1)$15,491 $(376)$15,864 $(377)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities362,289 (4,647)711,043 (152,976)1,073,332 (157,623)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities— — 94,901 (7,140)94,901 (7,140)
Private mortgage-backed securities and collateralized mortgage obligations— — 89,909 (6,289)89,909 (6,289)
CLOs108,779 (564)7,427 (33)116,206 (597)
Obligations of state and political subdivisions329 (7)5,412 (1,393)5,741 (1,400)
Totals$471,770 $(5,219)$924,183 $(168,207)$1,395,953 $(173,426)
1Comprised of 362 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.