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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Summary of Investment Securities
Available-for-Sale
The following table summarizes the amortized cost and fair value of AFS securities by major type:
At December 31, 2022
(In thousands)Amortized
Cost		Unrealized
Gains		Unrealized LossesFair Value
U.S. Treasury notes$755,968 $— $(38,928)$717,040 
Government agency debentures 302,018 — (43,644)258,374 
Municipal bonds and notes 1,719,110 5 (85,913)1,633,202 
Agency CMO64,984 — (5,019)59,965 
Agency MBS2,461,337 26 (303,339)2,158,024 
Agency CMBS1,664,600 — (258,114)1,406,486 
CMBS929,588 — (32,948)896,640 
CLO2,108 — (1)2,107 
Corporate debt795,999 — (91,587)704,412 
Private label MBS48,895 — (4,646)44,249 
Other12,548 — (350)12,198 
Total AFS securities$8,757,155 $31 $(864,489)$7,892,697 
At December 31, 2021
(In thousands)Amortized
Cost		Unrealized
Gains		Unrealized LossesFair Value
U.S. Treasury notes$398,664 $— $(1,698)$396,966 
Agency CMO88,109 2,326 (51)90,384 
Agency MBS1,568,293 36,130 (11,020)1,593,403 
Agency CMBS1,248,548 2,537 (18,544)1,232,541 
CMBS887,640 506 (1,883)886,263 
CLO21,860 — (13)21,847 
Corporate debt14,583 — (1,133)13,450 
Total AFS securities$4,227,697 $41,499 $(34,342)$4,234,854 
Accrued interest receivable on AFS securities of $36.9 million and $7.5 million at December 31, 2022, and 2021, respectively, is excluded from amortized cost and is reported in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets.
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
Unrealized Losses
The following tables summarize the gross unrealized losses and fair value of AFS securities by length of time each major security type has been in a continuous unrealized loss position:
 At December 31, 2022
 Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Number of
Holdings		Fair
Value		Unrealized
Losses
U.S. Treasury notes$337,563 $(19,167)$379,477 $(19,761)23$717,040 $(38,928)
Government agency debentures258,374 (43,644)— — 19258,374 (43,644)
Municipal bonds and notes1,616,771 (85,913)— — 4441,616,771 (85,913)
Agency CMO55,693 (4,640)4,272 (379)3959,965 (5,019)
Agency MBS1,641,544 (206,412)515,206 (96,927)4602,156,750 (303,339)
Agency CMBS485,333 (68,674)921,153 (189,440)1321,406,486 (258,114)
CMBS273,150 (8,982)598,490 (23,966)52871,640 (32,948)
CLO— — 2,107 (1)12,107 (1)
Corporate debt692,990 (89,692)8,421 (1,895)105701,411 (91,587)
Private label MBS44,249 (4,646)— — 344,249 (4,646)
Other12,198 (350)— — 412,198 (350)
Total AFS securities in an unrealized loss position$5,417,865 $(532,120)$2,429,126 $(332,369)1,282$7,846,991 $(864,489)
 At December 31, 2021
 Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Number of
Holdings		Fair
Value		Unrealized
Losses
U.S. Treasury notes$396,966 $(1,698)$— $— 8$396,966 $(1,698)
Agency CMO7,895 (51)— — 27,895 (51)
Agency MBS506,602 (7,354)110,687 (3,666)70617,289 (11,020)
Agency CMBS632,213 (6,163)335,480 (12,381)28967,693 (18,544)
CMBS724,762 (1,744)81,253 (139)50806,015 (1,883)
CLO— — 21,848 (13)121,848 (13)
Corporate debt4,203 (76)9,247 (1,057)313,450 (1,133)
Total AFS securities in an unrealized loss position$2,272,641 $(17,086)$558,515 $(17,256)162$2,831,156 $(34,342)
Debt Securities, Held-to-maturity
The following table summarizes the amortized cost, fair value, and ACL of HTM securities by major type:
At December 31, 2022
(In thousands)Amortized
Cost		Unrealized GainsUnrealized LossesFair ValueAllowanceNet Carrying Value
Agency CMO$28,358 $— $(2,060)$26,298 $— $28,358 
Agency MBS2,626,114 827 (339,592)2,287,349 — 2,626,114 
Agency CMBS2,831,949 845 (407,648)2,425,146 — 2,831,949 
Municipal bonds and notes928,845 1,098 (47,183)882,760 182 928,663 
CMBS149,613 — (9,713)139,900 — 149,613 
Total HTM securities$6,564,879 $2,770 $(806,196)$5,761,453 $182 $6,564,697 
At December 31, 2021
(In thousands)Amortized
Cost		Unrealized GainsUnrealized LossesFair ValueAllowanceNet Carrying Value
Agency CMO$42,405 $655 $(25)$43,035 $— $42,405 
Agency MBS2,901,593 71,444 (11,788)2,961,249 — 2,901,593 
Agency CMBS2,378,475 11,202 (43,844)2,345,833 — 2,378,475 
Municipal bonds and notes705,918 51,572 — 757,490 214 705,704 
CMBS169,948 3,381 — 173,329 — 169,948 
Total HTM securities$6,198,339 $138,254 $(55,657)$6,280,936 $214 $6,198,125 
The following table summarizes HTM securities pledged for deposits, borrowings, and other purposes:
At December 31,
(In thousands)2022At 2021
HTM securities pledged for deposits, at amortized cost$1,596,777$1,834,117
HTM securities pledged for borrowings and other, at amortized cost260,7351,243,139
Total HTM securities pledged$1,857,512$3,077,256
Debt Securities, Held-to-maturity, Allowance for Credit Loss The following table summarizes the activity in the ACL on HTM securities:
Years ended December 31,
(In thousands)202220212020
Balance, beginning of period$214$299$—
Adoption of CECL——397
(Benefit) for credit losses(32)(85)(98)
Balance, end of period$182$214$299
Summary of Debt Securities by Contractual Maturity The following table summarizes the amortized cost and fair value of AFS securities by contractual maturity:
At December 31, 2022
(In thousands)Amortized CostFair Value
Maturing within 1 year$204,757 $198,765 
After 1 year through 5 years1,200,088 1,127,769 
After 5 years through 10 years1,459,962 1,351,397 
After 10 years5,892,348 5,214,766 
Total AFS securities$8,757,155 $7,892,697 
The following table summarizes the amortized cost and fair value of HTM securities by contractual maturity:
At December 31, 2022
(In thousands)Amortized CostFair Value
Maturing within 1 year$2,195 $2,194 
After 1 year through 5 years53,632 54,275 
After 5 years through 10 years329,156 312,741 
After 10 years6,179,896 5,392,243 
Total HTM securities$6,564,879 $5,761,453 
Debt Securities, Available-for-Sale
The following table summarizes AFS securities pledged for deposits, borrowings, and other purposes:
At December 31,
(In thousands)20222021
AFS securities pledged for deposits, at fair value$2,573,072$855,323
AFS securities pledged for borrowings and other, at fair value1,195,101924,841
Total AFS securities pledged$3,768,173$1,780,164
Debt Securities, Held-to-maturity, Credit Quality Indicator
The following table summarizes the amortized cost basis of HTM securities based on their lowest publicly available credit rating:
At December 31, 2022
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2Baa2Not Rated
Agency CMOs$— $28,358 $— $— $— $— $— $— 
Agency MBS— 2,626,114 — — — — — — 
Agency CMBS— 2,831,949 — — — — — — 
Municipal bonds and notes336,035 163,312 255,235 116,870 38,177 4,165 — 15,051 
CMBS149,613 — — — — — — — 
Total HTM securities$485,648 $5,649,733 $255,235 $116,870 $38,177 $4,165 $— $15,051 
At December 31, 2021
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2Baa2Not Rated
Agency CMOs$— $42,405 $— $— $— $— $— $— 
Agency MBS— 2,901,593 — — — — — — 
Agency CMBS— 2,378,475 — — — — — — 
Municipal bonds and notes207,426 119,804 227,106 104,232 35,878 8,260 95 3,117 
CMBS169,948 — — — — — — — 
Total HTM securities$377,374 $5,442,277 $227,106 $104,232 $35,878 $8,260 $95 $3,117 
Schedule of Realized Gain (Loss)
The following table summarizes information from sales of AFS securities:
Years ended December 31,
(In thousands)202220212020
Proceeds from sales$172,947 $— $8,963 
Gross realized gains$— $— $8 
Gross realized losses6,751 — — 
(Loss) gain on sale of investment securities, net$(6,751)$— $8