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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2023
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair Value
U.S. Treasury notes$407,555 $— $(23,488)$384,067 
Government agency debentures302,115 — (41,014)261,101 
Municipal bonds and notes1,678,826 5 (74,681)1,604,150 
Agency CMO58,529 — (5,169)53,360 
Agency MBS2,476,218 9 (291,320)2,184,907 
Agency CMBS2,041,431 44 (306,553)1,734,922 
CMBS907,602 — (31,483)876,119 
Corporate debt712,726 — (103,967)608,759 
Private label MBS47,485 — (4,435)43,050 
Other9,817 — (911)8,906 
Total available-for-sale securities$8,642,304 $58 $(883,021)$7,759,341 
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 $37.1 million and $36.9 million at June 30, 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 the carrying value of available-for-sale securities pledged for deposits, borrowings, and other purposes:
(In thousands)At June 30, 2023At December 31, 2022
Pledged for deposits$2,251,240$2,573,072
Pledged for borrowings and other4,211,7331,195,101
Total available-for-sale securities pledged$6,462,973$3,768,173
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value
The following tables summarize the gross unrealized losses and fair value of available-for-sale securities by length of time each major security type has been in a continuous unrealized loss position:
 At June 30, 2023
 Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Number of
Holdings		Fair
Value		Unrealized
Losses
U.S. Treasury notes$— $— $384,067 $(23,488)14$384,067 $(23,488)
Government agency debentures32,481 (2,376)228,620 (38,638)19261,101 (41,014)
Municipal bonds and notes30,722 (506)1,554,918 (74,175)4201,585,640 (74,681)
Agency CMO7,018 (349)46,342 (4,820)3753,360 (5,169)
Agency MBS197,989 (4,220)1,986,029 (287,100)4652,184,018 (291,320)
Agency CMBS345,784 (10,832)1,347,550 (295,721)1421,693,334 (306,553)
CMBS48,536 (1,439)827,583 (30,044)51876,119 (31,483)
Corporate debt8,805 (1,297)599,954 (102,670)92608,759 (103,967)
Private label MBS11,880 (1,153)31,170 (3,282)343,050 (4,435)
Other4,789 (211)4,117 (700)28,906 (911)
Total$688,004 $(22,383)$7,010,350 $(860,638)1,245$7,698,354 $(883,021)
 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 June 30, 2023
(In thousands)Amortized CostFair Value
Maturing within 1 year$33,337 $33,164 
After 1 year through 5 years1,040,297 978,096 
After 5 through 10 years1,401,731 1,277,563 
After 10 years6,166,939 5,470,518 
Total available-for-sale securities$8,642,304 $7,759,341 
The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity:
At June 30, 2023
(In thousands)Amortized CostFair Value
Maturing within 1 year$4,341 $4,340 
After 1 year through 5 years55,954 56,141 
After 5 through 10 years344,666 326,276 
After 10 years6,539,039 5,679,925 
Total held-to-maturity securities$6,944,000 $6,066,682 
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 June 30, 2023
(In thousands)
Amortized
Cost (1)
Unrealized
Gains		Unrealized
Losses		Fair ValueAllowanceNet Carrying Value
Agency CMO$25,791 $— $(2,133)$23,658 $— $25,791 
Agency MBS2,541,384 524 (325,432)2,216,476 — 2,541,384 
Agency CMBS3,353,205 — (505,510)2,847,695 — 3,353,205 
Municipal bonds and notes919,112 798 (36,263)883,647 216 918,896 
CMBS104,508 — (9,302)95,206 — 104,508 
Total held-to-maturity securities$6,944,000 $1,322 $(878,640)$6,066,682 $216 $6,943,784 
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 June 30,Six months ended June 30,
(In thousands)2023202220232022
Balance, beginning of period$282$204$182$214
(Benefit) provision for credit losses(66)634(4)
Balance, end of period$216$210$216$210
The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating:
June 30, 2023
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2A3Not Rated
Agency CMO$— $25,791 $— $— $— $— $— $— 
Agency MBS— 2,541,384 — — — — — — 
Agency CMBS— 3,353,205 — — — — — — 
Municipal bonds and notes334,490 162,966 254,457 116,030 32,949 — 4,165 14,055 
CMBS104,508 — — — — — — — 
Total held-to-maturity securities$438,998 $6,083,346 $254,457 $116,030 $32,949 $— $4,165 $14,055 
December 31, 2022
Investment Grade
(In thousands)AaaAa1Aa2Aa3A1A2A3Not Rated
Agency CMO$— $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 the carrying value of held-to-maturity securities pledged for deposits, borrowings, and other purposes:
(In thousands)At June 30, 2023At December 31, 2022
Pledged for deposits$1,259,307$1,596,777
Pledged for borrowings and other5,080,928260,735
Total held-to-maturity securities pledged$6,340,235$1,857,512