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Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Securities [Abstract]  
Schedule of Debt Securities, Available-for-Sale
The amortized cost, gross unrealized gains and losses, ACL and fair value of available for sale securities as of the dates indicated were as follows:
As of December 31, 2024
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
(In thousands)
Debt securities:
Government-sponsored residential mortgage-backed securities$3,099,328 $— $(537,433)$— $2,561,895 
Government-sponsored commercial mortgage-backed securities1,362,519 — (201,408)— 1,161,111 
U.S. Agency bonds19,608 — (1,936)— 17,672 
U.S. Treasury securities99,784 — (2,165)— 97,619 
State and municipal bonds and obligations197,405 — (14,104)— 183,301 
$4,778,644 $— $(757,046)$— $4,021,598 
As of December 31, 2023
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
(In thousands)
Debt securities:
Government-sponsored residential mortgage-backed securities$3,302,165 $— $(521,527)$— $2,780,638 
Government-sponsored commercial mortgage-backed securities1,326,029 — (201,653)— 1,124,376 
U.S. Agency bonds236,454 — (20,443)— 216,011 
U.S. Treasury securities99,552 — (4,400)— 95,152 
State and municipal bonds and obligations197,704 172 (6,532)— 191,344 
$5,161,904 $172 $(754,555)$— $4,407,521 
Schedule of Realized Gain (Loss)
The following table summarizes gross realized gains and losses from sales of AFS securities for the periods indicated:
For the Years Ended December 31,
202420232022
(In thousands)
Gross realized gains from sales of AFS securities$— $— $1,775 
Gross realized losses from sales of AFS securities(16,798)(333,170)(4,932)
Net losses from sales of AFS securities$(16,798)$(333,170)$(3,157)
Schedule of Government-Sponsored Residential Mortgage-Backed Securities with Gross Unrealized Losses
Information pertaining to AFS securities with gross unrealized losses as of December 31, 2024 and 2023, for which the Company did not recognize a provision for credit losses under CECL, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:
As of December 31, 2024
Less than 12 Months12 Months or LongerTotal
# of
Holdings		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value
(Dollars in thousands)
Government-sponsored residential mortgage-backed securities324$9 $113,326 $537,424 $2,448,569 $537,433 $2,561,895 
Government-sponsored commercial mortgage-backed securities18727 86,201 201,381 1,074,910 201,408 1,161,111 
U.S. Agency bonds1— — 1,936 17,672 1,936 17,672 
U.S. Treasury securities6— — 2,165 97,619 2,165 97,619 
State and municipal bonds and obligations238819 19,361 13,285 163,940 14,104 183,301 
756$855 $218,888 $756,191 $3,802,710 $757,046 $4,021,598 
As of December 31, 2023
Less than 12 Months12 Months or LongerTotal
# of
Holdings		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value
(Dollars in thousands)
Government-sponsored residential mortgage-backed securities324$— $— $521,527 $2,780,638 $521,527 $2,780,638 
Government-sponsored commercial mortgage-backed securities187— — 201,653 1,124,376 201,653 1,124,376 
U.S. Agency bonds23— — 20,443 216,011 20,443 216,011 
U.S. Treasury securities636 4,927 4,364 90,225 4,400 95,152 
State and municipal bonds and obligations196233 22,894 6,299 135,279 6,532 158,173 
736$269 $27,821 $754,286 $4,346,529 $754,555 $4,374,350 
Schedule of Debt Securities, Held-to-Maturity
The amortized cost, gross unrealized gains and losses, ACL and fair value of HTM securities as of the dates indicated were as follows:
As of December 31, 2024
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
(In thousands)
Debt securities:
Government-sponsored residential mortgage-backed securities$231,709 $— $(29,438)$— $202,271 
Government-sponsored commercial mortgage-backed securities189,006 — (19,553)— 169,453 
$420,715 $— $(48,991)$— $371,724 
As of December 31, 2023
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Allowance for Credit LossesFair
Value
(In thousands)
Debt securities:
Government-sponsored residential mortgage-backed securities$254,752 $— $(24,433)$— $230,319 
Government-sponsored commercial mortgage-backed securities194,969 — (20,466)— 174,503 
$449,721 $— $(44,899)$— $404,822 
Schedule of Fair Value of Available for Sale Securities by Contractual Maturities
The amortized cost and estimated fair value of AFS and HTM securities by scheduled contractual maturities as of dates indicated were as follows:
As of December 31, 2024
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
(In thousands)
AFS securities
Government-sponsored residential mortgage-backed securities$561 $557 $21,535 $20,940 $13,212 $12,268 $3,064,020 $2,528,130 $3,099,328 $2,561,895 
Government-sponsored commercial mortgage-backed securities— — 436,515 404,181 270,546 235,853 655,458 521,077 1,362,519 1,161,111 
U.S. Agency bonds— — 19,608 17,672 — — — — 19,608 17,672 
U.S. Treasury securities49,947 49,717 49,837 47,902 — — — — 99,784 97,619 
State and municipal bonds and obligations5,368 5,319 33,497 32,284 51,326 48,743 107,214 96,955 197,405 183,301 
Total available for sale securities55,876 55,593 560,992 522,979 335,084 296,864 3,826,692 3,146,162 4,778,644 4,021,598 
HTM securities
Government-sponsored residential mortgage-backed securities— — — — — — 231,709 202,271 231,709 202,271 
Government-sponsored commercial mortgage-backed securities— — 133,168 121,471 55,838 47,982 — — 189,006 169,453 
Total held to maturity securities— — 133,168 121,471 55,838 47,982 231,709 202,271 420,715 371,724 
Total$55,876 $55,593 $694,160 $644,450 $390,922 $344,846 $4,058,401 $3,348,433 $5,199,359 $4,393,322 
As of December 31, 2023
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
(In thousands)
AFS securities
Government-sponsored residential mortgage-backed securities$— $— $29,288 $28,188 $22,735 $21,235 $3,250,142 $2,731,215 $3,302,165 $2,780,638 
Government-sponsored commercial mortgage-backed securities— — 256,229 234,725 379,749 327,198 690,051 562,453 1,326,029 1,124,376 
U.S. Agency bonds— — 236,454 216,011 — — — — 236,454 216,011 
U.S. Treasury securities— — 99,552 95,152 — — — — 99,552 95,152 
State and municipal bonds and obligations213 209 30,131 29,393 44,047 43,260 123,313 118,482 197,704 191,344 
Total available for sale securities213 209 651,654 603,469 446,531 391,693 4,063,506 3,412,150 5,161,904 4,407,521 
HTM securities
Government-sponsored residential mortgage-backed securities— — — — — — 254,752 230,319 254,752 230,319 
Government-sponsored commercial mortgage-backed securities— — 80,014 72,952 114,955 101,551 — — 194,969 174,503 
Total held to maturity securities— — 80,014 72,952 114,955 101,551 254,752 230,319 449,721 404,822 
Total$213 $209 $731,668 $676,421 $561,486 $493,244 $4,318,258 $3,642,469 $5,611,625 $4,812,343