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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2026
Investment Securities [Abstract]  
Summary Investment Holdings
Investment securities consisted of the following at March 31, 2026 and December 31, 2025.

(In thousands)March 31, 2026December 31, 2025
Available for sale debt securities$8,646,127 $9,095,513 
Trading debt securities44,329 40,080 
Equity securities:
Readily determinable fair value46,193 47,551 
No readily determinable fair value10,000 9,803 
Other:
Federal Reserve Bank stock54,434 35,918 
Federal Home Loan Bank stock10,141 10,198 
Private equity investments183,764 184,343 
Total investment securities (1)
$8,994,988 $9,423,406 
(1)Accrued interest receivable totaled $36.4 million and $42.0 million at March 31, 2026 and December 31, 2025, respectively, and was included within other assets on the consolidated balance sheets.
Summary Of Available For Sale Investment Securities By Maturity Groupings A summary of the available for sale debt securities by maturity groupings as of March 31, 2026 is shown below. The investment portfolio includes agency mortgage-backed securities, which are guaranteed by agencies such as FHLMC, FNMA, and Government National Mortgage Association (GNMA), in addition to non-agency mortgage-backed securities, which have no guarantee but are collateralized by commercial and residential mortgages. Also included are certain other asset-backed securities, which are primarily
collateralized by credit cards, automobiles, student loans, and commercial loans. These securities differ from traditional debt securities primarily in that they may have uncertain maturity dates and are priced based on estimated prepayment rates on the underlying collateral.
(In thousands)Amortized
Cost		Fair
Value
U.S. government and federal agency obligations:
Within 1 year$422,299 $423,185 
After 1 but within 5 years1,704,983 1,707,211 
After 5 but within 10 years913,297 910,616 
After 10 years106,606 106,281 
Total U.S. government and federal agency obligations3,147,185 3,147,293 
Government-sponsored enterprise obligations:
After 1 but within 5 years3,962 3,737 
After 5 but within 10 years30,816 26,321 
After 10 years19,821 13,927 
Total government-sponsored enterprise obligations54,599 43,985 
State and municipal obligations:
Within 1 year55,782 55,348 
After 1 but within 5 years428,431 409,208 
After 5 but within 10 years116,777 103,102 
After 10 years104,874 87,166 
Total state and municipal obligations705,864 654,824 
Mortgage and asset-backed securities:
  Agency mortgage-backed securities3,701,146 3,123,669 
  Non-agency mortgage-backed securities446,168 414,777 
  Asset-backed securities1,104,943 1,093,819 
Total mortgage and asset-backed securities5,252,257 4,632,265 
Other debt securities:
Within 1 year8,021 7,924 
After 1 but within 5 years59,891 55,915 
After 5 but within 10 years81,872 80,151 
After 10 years23,937 23,770 
Total other debt securities173,721 167,760 
Total available for sale debt securities$9,333,626 $8,646,127 
Securities With Unrealized Losses and Length of Impairment Period
The table below summarizes debt securities available for sale in an unrealized loss position, aggregated by length of loss period, for which an allowance for credit losses has not been recorded at March 31, 2026 and December 31, 2025. Unrealized losses on these available for sale securities have not been recognized into income because after review, the securities were deemed not to be impaired. The unrealized losses on these securities are primarily attributable to changes in interest rates and current market conditions. At March 31, 2026, the Company does not intend to sell the securities, nor is it anticipated that it would be required to sell any of these securities at a loss.

Less than 12 months12 months or longerTotal
 
(In thousands)
   Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses		Fair ValueUnrealized
Losses
March 31, 2026
U.S. government and federal agency obligations$1,321,452 $9,277 $190,275 $7,123 $1,511,727 $16,400 
Government-sponsored enterprise obligations — — 43,985 10,614 43,985 10,614 
State and municipal obligations30,515 118 614,192 50,935 644,707 51,053 
Mortgage and asset-backed securities:
   Agency mortgage-backed securities3,670 47 3,047,265 578,793 3,050,935 578,840 
   Non-agency mortgage-backed securities— — 401,037 31,665 401,037 31,665 
   Asset-backed securities68,558 181 514,421 16,102 582,979 16,283 
Total mortgage and asset-backed securities72,228 228 3,962,723 626,560 4,034,951 626,788 
Other debt securities18,832 10 93,283 6,578 112,115 6,588 
Total $1,443,027 $9,633 $4,904,458 $701,810 $6,347,485 $711,443 
December 31, 2025
U.S. government and federal agency obligations$612,167 $2,620 $314,006 $8,244 $926,173 $10,864 
Government-sponsored enterprise obligations— — 44,712 10,239 44,712 10,239 
State and municipal obligations12,157 18 636,492 50,323 648,649 50,341 
Mortgage and asset-backed securities:
   Agency mortgage-backed securities2,437 30 3,148,627 565,056 3,151,064 565,086 
   Non-agency mortgage-backed securities— — 421,508 31,942 421,508 31,942 
   Asset-backed securities32,875 36 546,984 16,925 579,859 16,961 
Total mortgage and asset-backed securities35,312 66 4,117,119 613,923 4,152,431 613,989 
Other debt securities— — 110,038 6,661 110,038 6,661 
Total $659,636 $2,704 $5,222,367 $689,390 $5,882,003 $692,094 
Available For Sale Securities Unrealized Gains And Losses By Security Type
For debt securities classified as available for sale, the following table shows the amortized cost, fair value, and allowance for credit losses of securities available for sale at March 31, 2026 and December 31, 2025, and the corresponding amounts of gross unrealized gains and losses (pre-tax) in AOCI, by security type.

 
 
(In thousands)
Amortized CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit Losses
Fair Value
March 31, 2026
U.S. government and federal agency obligations$3,147,185 $16,508 $(16,400)$— $3,147,293 
Government-sponsored enterprise obligations54,599 — (10,614)— 43,985 
State and municipal obligations705,864 13 (51,053)— 654,824 
Mortgage and asset-backed securities:
  Agency mortgage-backed securities3,701,146 1,363 (578,840)— 3,123,669 
  Non-agency mortgage-backed securities446,168 274 (31,665)— 414,777 
  Asset-backed securities1,104,943 5,159 (16,283)— 1,093,819 
Total mortgage and asset-backed securities5,252,257 6,796 (626,788)— 4,632,265 
Other debt securities173,721 627 (6,588)— 167,760 
Total$9,333,626 $23,944 $(711,443)$— $8,646,127 
December 31, 2025
U.S. government and federal agency obligations$3,257,561 $32,403 $(10,864)$— $3,279,100 
Government-sponsored enterprise obligations54,951 — (10,239)— 44,712 
State and municipal obligations715,037 37 (50,341)— 664,733 
Mortgage and asset-backed securities:
  Agency mortgage-backed securities3,786,811 1,380 (565,086)— 3,223,105 
  Non-agency mortgage-backed securities467,200 430 (31,942)— 435,688 
  Asset-backed securities1,269,503 9,503 (16,961)— 1,262,045 
Total mortgage and asset-backed securities5,523,514 11,313 (613,989)— 4,920,838 
Other debt securities191,215 1,576 (6,661)— 186,130 
Total$9,742,278 $45,329 $(692,094)$— $9,095,513 
Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses
The following table presents proceeds from sales of securities and the components of investment securities gains and losses which have been recognized in earnings.
For the Three Months Ended March 31
(In thousands)20262025
Proceeds from sales of securities:
Other investments
$17,662 $6,757 
Total proceeds
$17,662 $6,757 
Investment securities gains (losses), net:
Available for sale debt securities:
Gains realized on sales$— $4 
Equity securities:
 Gains (losses) on equity securities, net160 (97)
Other:
 Gains realized on sales
597 1,071 
 Losses realized on sales
— (44)
Fair value adjustments, net 10,890 (8,525)
Total investment securities gains (losses), net$11,647 $(7,591)