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Securities (Tables)
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Fair Value of Securities Available for Sale
The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale (“AFS”) and held-to-maturity (“HTM”) at March 31, 2024 and December 31, 2023 are summarized as follows:
 March 31, 2024
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities   
U.S. Treasury securities and obligations of U.S. government agencies$34,245 $113 $(530)$33,828 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,360,816 1,159 (193,157)1,168,818 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities316,950 1,577 (17,972)300,555 
Private mortgage-backed securities and collateralized mortgage obligations136,585 66 (10,500)126,151 
Collateralized loan obligations284,677 61 (111)284,627 
Obligations of state and political subdivisions10,475 — (1,313)9,162 
Other debt securities25,681 655 (14)26,322 
Totals$2,169,429 $3,631 $(223,597)$1,949,463 
Held-to-Maturity Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$580,626 $— $(118,761)$461,865 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities89,270 — (10,975)78,295 
Totals$669,896 $— $(129,736)$540,160 
 December 31, 2023
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities    
U.S. Treasury securities and obligations of U.S. government agencies$37,718 $205 $(478)$37,445 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,152,753 780 (184,152)969,381 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities385,013 2,824 (19,565)368,272 
Private mortgage-backed securities and collateralized mortgage obligations135,878 36 (10,911)125,003 
Collateralized loan obligations300,855 11 (1,411)299,455 
Obligations of state and political subdivisions10,486 — (1,096)9,390 
Other debt securities26,599 576 (101)27,074 
Totals$2,049,302 $4,432 $(217,714)$1,836,020 
Held-to-Maturity Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$590,676 $— $(111,746)$478,930 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities89,637 — (10,208)79,429 
Totals$680,313 $— $(121,954)$558,359 
Summary of Amortized Cost and Fair Value of Held-to-Maturity Securities
The amortized cost, gross unrealized gains and losses and fair value of securities available-for-sale (“AFS”) and held-to-maturity (“HTM”) at March 31, 2024 and December 31, 2023 are summarized as follows:
 March 31, 2024
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities   
U.S. Treasury securities and obligations of U.S. government agencies$34,245 $113 $(530)$33,828 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,360,816 1,159 (193,157)1,168,818 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities316,950 1,577 (17,972)300,555 
Private mortgage-backed securities and collateralized mortgage obligations136,585 66 (10,500)126,151 
Collateralized loan obligations284,677 61 (111)284,627 
Obligations of state and political subdivisions10,475 — (1,313)9,162 
Other debt securities25,681 655 (14)26,322 
Totals$2,169,429 $3,631 $(223,597)$1,949,463 
Held-to-Maturity Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$580,626 $— $(118,761)$461,865 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities89,270 — (10,975)78,295 
Totals$669,896 $— $(129,736)$540,160 
 December 31, 2023
(In thousands)Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available-for-Sale Debt Securities    
U.S. Treasury securities and obligations of U.S. government agencies$37,718 $205 $(478)$37,445 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities1,152,753 780 (184,152)969,381 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities385,013 2,824 (19,565)368,272 
Private mortgage-backed securities and collateralized mortgage obligations135,878 36 (10,911)125,003 
Collateralized loan obligations300,855 11 (1,411)299,455 
Obligations of state and political subdivisions10,486 — (1,096)9,390 
Other debt securities26,599 576 (101)27,074 
Totals$2,049,302 $4,432 $(217,714)$1,836,020 
Held-to-Maturity Debt Securities
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities$590,676 $— $(111,746)$478,930 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities89,637 — (10,208)79,429 
Totals$680,313 $— $(121,954)$558,359 
Summary of Investments Classified by Contractual Maturity Securities not due at a single maturity date are shown separately.
 Held-to-MaturityAvailable-for-Sale
(In thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in less than one year$— $— $4,429 $4,421 
Due after one year through five years— — 4,200 4,184 
Due after five years through ten years— — 8,599 8,484 
Due after ten years— — 27,492 25,901 
 — — 44,720 42,990 
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities580,626 461,865 1,360,816 1,168,818 
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities89,270 78,295 316,950 300,555 
Private mortgage-backed securities and collateralized mortgage obligations— — 136,585 126,151 
Collateralized loan obligations— — 284,677 284,627 
Other debt securities— — 25,681 26,322 
Totals$669,896 $540,160 $2,169,429 $1,949,463 
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, 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$12,911 $(75)$13,135 $(455)$26,046 $(530)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities148,889 (2,159)836,928 (190,998)985,817 (193,157)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities17,741 (125)209,223 (17,847)226,964 (17,972)
Private mortgage-backed securities and collateralized mortgage obligations2,599 (28)113,381 (10,472)115,980 (10,500)
Collateralized loan obligations27,408 (17)80,389 (94)107,797 (111)
Obligations of state and political subdivisions323 (7)5,679 (1,306)6,002 (1,313)
Other debt securities— — 3,138 (14)3,138 (14)
Totals$209,871 $(2,411)$1,261,873 $(221,186)$1,471,744 $(223,597)
1Comprised of 397 individual securities.
 December 31, 2023
 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$24,933 $(143)$3,594 $(335)$28,527 $(478)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities91,867 (9,320)826,324 (174,832)918,191 (184,152)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities24,251 (1,270)262,666 (18,295)286,917 (19,565)
Private mortgage-backed securities and collateralized mortgage obligations3,945 (69)119,475 (10,842)123,420 (10,911)
Collateralized loan obligations60,087 (223)232,545 (1,188)292,632 (1,411)
Obligations of state and political subdivisions326 (2)9,064 (1,094)9,390 (1,096)
Other debt securities10,579 (101)— — 10,579 (101)
Totals$215,988 $(11,128)$1,453,668 $(206,586)$1,669,656 $(217,714)
1Comprised of 504 individual securities.