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Securities (Tables)
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Debt Securities AFS and HTM
The amortized cost, gross unrealized gains and losses and fair value of debt securities AFS and HTM at December 31, 2025 and December 31, 2024 are summarized as follows:
 December 31, 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$54,831 $365 $(451)$54,745 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities3,681,499 41,388 (135,388)3,587,499 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities395,165 4,636 (5,928)393,873 
Private mortgage-backed securities and collateralized mortgage obligations131,846 561 (5,010)127,397 
CLOs423,864 636 (512)423,988 
Obligations of state and political subdivisions336,417 651 (2,520)334,548 
Other debt securities242,672 421 (576)242,517 
Totals$5,266,294 $48,658 $(150,385)$5,164,567 
HTM Debt Securities     
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$498,931 $— $(90,696)$408,235 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,247 — (5,922)81,325 
Totals$586,178 $— $(96,618)$489,560 
 
 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 December 31, 2025 and December 31, 2024 are summarized as follows:
 December 31, 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$54,831 $365 $(451)$54,745 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities3,681,499 41,388 (135,388)3,587,499 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities395,165 4,636 (5,928)393,873 
Private mortgage-backed securities and collateralized mortgage obligations131,846 561 (5,010)127,397 
CLOs423,864 636 (512)423,988 
Obligations of state and political subdivisions336,417 651 (2,520)334,548 
Other debt securities242,672 421 (576)242,517 
Totals$5,266,294 $48,658 $(150,385)$5,164,567 
HTM Debt Securities     
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$498,931 $— $(90,696)$408,235 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,247 — (5,922)81,325 
Totals$586,178 $— $(96,618)$489,560 
 
 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)$507,594 
Schedule of Investments Classified by Contractual Maturity
The amortized cost and fair value of securities HTM and AFS at December 31, 2025, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $7,571 $7,584 
Due after one year through five years— — 9,888 9,887 
Due after five years through ten years— — 36,407 35,602 
Due after ten years— — 337,382 336,220 
 $— $— $391,248 $389,293 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$498,931 $408,235 $3,681,499 $3,587,499 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities87,247 81,325 395,165 393,873 
Private mortgage-backed securities and collateralized mortgage obligations— — 131,846 127,397 
CLOs— — 423,864 423,988 
Other debt securities— — 242,672 242,517 
Totals$586,178 $489,560 $5,266,294 $5,164,567 
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 ACL has been recorded.
 December 31, 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$21,846 $(31)$13,932 $(420)$35,778 $(451)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities378,739 (1,625)730,551 (133,763)1,109,290 (135,388)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities90,765 (61)95,090 (5,867)185,855 (5,928)
Private mortgage-backed securities and collateralized mortgage obligations969 (1)76,829 (5,009)77,798 (5,010)
CLOs211,052 (320)38,882 (192)249,934 (512)
Obligations of state and political subdivisions244,168 (1,445)5,730 (1,075)249,898 (2,520)
Other debt securities132,345 (576)— — 132,345 (576)
Totals$1,079,884 $(4,059)$961,014 $(146,326)$2,040,898 $(150,385)
1Comprised of 383 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