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Securities (Tables)
 3 Months Ended
Mar. 31, 2026
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 March 31, 2026 and December 31, 2025 are summarized as follows:
 March 31, 2026
(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$62,772 $241 $(775)$62,238 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities3,678,595 22,591 (110,558)3,590,628 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities358,829 3,187 (4,569)357,447 
Private mortgage-backed securities and collateralized mortgage obligations91,193 235 (4,978)86,450 
CLOs426,034 401 (2,254)424,181 
Obligations of state and political subdivisions334,560 147 (6,024)328,683 
Other debt securities221,475 91 (1,933)219,633 
Totals$5,173,458 $26,893 $(131,091)$5,069,260 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$489,268 $— $(92,467)$396,801 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities86,887 — (5,982)80,905 
Totals$576,155 $— $(98,449)$477,706 
 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 
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 March 31, 2026 and December 31, 2025 are summarized as follows:
 March 31, 2026
(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$62,772 $241 $(775)$62,238 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities3,678,595 22,591 (110,558)3,590,628 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities358,829 3,187 (4,569)357,447 
Private mortgage-backed securities and collateralized mortgage obligations91,193 235 (4,978)86,450 
CLOs426,034 401 (2,254)424,181 
Obligations of state and political subdivisions334,560 147 (6,024)328,683 
Other debt securities221,475 91 (1,933)219,633 
Totals$5,173,458 $26,893 $(131,091)$5,069,260 
HTM Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$489,268 $— $(92,467)$396,801 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities86,887 — (5,982)80,905 
Totals$576,155 $— $(98,449)$477,706 
 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)$489,560 
Schedule of Investments Classified by Contractual Maturity
The amortized cost and fair value of securities HTM and AFS as of March 31, 2026, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because prepayments of the underlying collateral for these securities may occur, due to the right to call or repay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $6,244 $6,269 
Due after one year through five years— — 4,087 4,043 
Due after five years through ten years— — 50,324 49,032 
Due after ten years— — 336,677 331,577 
 — — 397,332 390,921 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities489,268 396,801 3,678,595 3,590,628 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities86,887 80,905 358,829 357,447 
Private mortgage-backed securities and collateralized mortgage obligations— — 91,193 86,450 
CLOs— — 426,034 424,181 
Other debt securities— — 221,475 219,633 
Totals$576,155 $477,706 $5,173,458 $5,069,260 
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.
 March 31, 2026
 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$36,554 $(387)$12,026 $(388)$48,580 $(775)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,597,196 (12,433)449,907 (98,125)2,047,103 (110,558)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities82,032 (164)78,322 (4,405)160,354 (4,569)
Private mortgage-backed securities and collateralized mortgage obligations— — 73,226 (4,978)73,226 (4,978)
CLOs341,087 (1,883)56,600 (371)397,687 (2,254)
Obligations of state and political subdivisions293,912 (4,870)5,652 (1,154)299,564 (6,024)
Other debt securities197,074 (1,933)— — 197,074 (1,933)
Totals$2,547,855 $(21,670)$675,733 $(109,421)$3,223,588 $(131,091)
1Comprised of 490 individual securities.
 
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.