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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-sale
The following tables summarize the amortized cost and fair value of available-for-sale securities by major type:
 At March 31, 2023
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Treasury notes$407,224 $— $(20,452)$386,772 
Government agency debentures302,067 — (39,725)262,342 
Municipal bonds and notes1,707,779 7 (62,558)1,645,228 
Agency CMO61,728 — (4,266)57,462 
Agency MBS2,496,654 368 (266,172)2,230,850 
Agency CMBS1,889,561 3,542 (257,851)1,635,252 
CMBS927,591 — (25,533)902,058 
Corporate debt714,359 — (88,836)625,523 
Private label MBS48,325 — (4,063)44,262 
Other10,061 — (833)9,228 
Total available-for-sale securities$8,565,349 $3,917 $(770,289)$7,798,977 
At December 31, 2022
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Treasury notes$755,968 $— $(38,928)$717,040
Government agency debentures302,018 — (43,644)258,374
Municipal bonds and notes1,719,110 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 MBS 48,895 — (4,646)44,249
Other12,548 — (350)12,198
Total available-for-sale securities$8,757,155 $31 $(864,489)$7,892,697 
(1)Accrued interest receivable on available-for-sale securities of $41.4 million and $36.9 million at March 31, 2023, and
December 31, 2022, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Condensed Consolidated Balance Sheets.
The following table summarizes available-for-sale securities pledged for deposits, borrowings, and other purposes:
(In thousands)At March 31, 2023At December 31, 2022
Pledged for deposits$2,868,000$2,573,072
Pledged for borrowings and other3,848,0391,195,101
Total available-for-sale securities pledged$6,716,039$3,768,173
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The following tables summarize the gross unrealized losses and fair value of available-for-sale securities by length of time each major security type has been in a continuous unrealized loss position:
 At March 31, 2023
 Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Number of
Holdings		Fair
Value		Unrealized
Losses
U.S. Treasury notes$— $— $386,772 $(20,452)14$386,772 $(20,452)
Government agency debentures71,134 (3,714)191,208 (36,011)19262,342 (39,725)
Municipal bonds and notes15,479 (239)1,598,253 (62,319)4301,613,732 (62,558)
Agency CMO7,915 (228)49,547 (4,038)3857,462 (4,266)
Agency MBS86,133 (3,319)2,045,564 (262,853)4592,131,697 (266,172)
Agency CMBS64,576 (933)1,397,565 (256,918)1331,462,141 (257,851)
CMBS155,493 (2,056)746,565 (23,477)51902,058 (25,533)
Corporate debt13,041 (1,158)612,482 (87,678)92625,523 (88,836)
Private label MBS44,262 (4,063)— — 344,262 (4,063)
Other4,810 (190)4,168 (643)28,978 (833)
Total$462,843 $(15,900)$7,032,124 $(754,389)1,241$7,494,967 $(770,289)
 At December 31, 2022
 Less Than Twelve MonthsTwelve Months or LongerTotal
(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 notes 1,616,771 (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$5,417,865 $(532,120)$2,429,126 $(332,369)1,282$7,846,991 $(864,489)
Summary of Debt Securities by Contractual Maturity The following table summarizes the amortized cost and fair value of available-for-sale securities by contractual maturity:
At March 31, 2023
(In thousands)Amortized CostFair Value
Maturing within 1 year$41,886 $41,593 
After 1 year through 5 years953,221 903,665 
After 5 through 10 years1,469,500 1,364,238 
After 10 years6,100,742 5,489,481 
Total available-for-sale securities$8,565,349 $7,798,977 
The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity:
At March 31, 2023
(In thousands)Amortized CostFair Value
Maturing within 1 year$6,093 $6,115 
After 1 year through 5 years52,893 53,722 
After 5 through 10 years338,353 324,864 
After 10 years6,666,166 5,935,981 
Total held-to-maturity securities$7,063,505 $6,320,682 
Debt Securities, Held-to-maturity
The following tables summarize the amortized cost, fair value, and ACL on held-to-maturity securities by major type:
At March 31, 2023
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair ValueAllowanceNet Carrying Value
Agency CMO$27,101 $— $(1,727)$25,374 $— $27,101 
Agency MBS2,613,113 1,458 (300,457)2,314,114 — 2,613,113 
Agency CMBS3,364,186 3,790 (410,763)2,957,213 — 3,364,186 
Municipal bonds and notes927,501 2,957 (29,188)901,270 282 927,219 
CMBS131,604 — (8,893)122,711 — 131,604 
Total held-to-maturity securities$7,063,505 $8,205 $(751,028)$6,320,682 $282 $7,063,223 
At December 31, 2022
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair 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 held-to-maturity securities$6,564,879 $2,770 $(806,196)$5,761,453 $182 $6,564,697 
The following table summarizes the activity in the ACL on held-to-maturity securities:
Three months ended March 31,
(In thousands)20232022
Balance, beginning of period$182$214
Provision (benefit) for credit losses100(10)
Balance, end of period$282$204
The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating:
March 31, 2023
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2Not Rated
Agency CMO$— $27,101 $— $— $— $— $— 
Agency MBS— 2,613,113 — — — — — 
Agency CMBS— 3,364,186 — — — — — 
Municipal bonds and notes350,578 163,138 254,843 116,343 38,134 4,165 300 
CMBS131,604 — — — — — — 
Total held-to-maturity securities$482,182 $6,167,538 $254,843 $116,343 $38,134 $4,165 $300 
December 31, 2022
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2Not Rated
Agency CMO$— $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 held-to-maturity securities$485,648 $5,649,733 $255,235 $116,870 $38,177 $4,165 $15,051 
The following table summarizes held-to-maturity securities pledged for deposits, borrowings, and other purposes:
(In thousands)At March 31, 2023At December 31, 2022
Pledged for deposits$1,573,285$1,596,777
Pledged for borrowings and other5,057,769260,735
Total held-to-maturity securities pledged$6,631,054$1,857,512