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Investment Securities
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investment Securities
Investment securities are designated as AFS, HTM, or equity on the consolidated balance sheets. The amortized cost and fair values of AFS and HTM securities at March 31, 2026 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $1 $(44)$3,020 
Residential mortgage-related securities:
FNMA/FHLMC136,572 892 (5,881)131,583 
GNMA5,091,918 12,930 (8,189)5,096,659 
Commercial mortgage-related securities:
FNMA/FHLMC17,864 — (928)16,936 
GNMA112,710 — (4,579)108,131 
Asset backed securities:
FFELP92,852 12 (1,036)91,828 
SBA63,257 231 (187)63,301 
Other debt securities3,000 — (2)2,998 
Total AFS investment securities$5,521,236 $14,066 $(20,846)$5,514,456 
HTM investment securities
U.S. Treasury securities$996 $11 $— $1,007 
Obligations of state and political subdivisions (municipal securities)1,618,922 1,212 (157,227)1,462,907 
Residential mortgage-related securities:
FNMA/FHLMC811,047 38 (129,239)681,846 
GNMA38,021 33 (2,365)35,689 
Private-label298,196 — (44,962)253,234 
Commercial mortgage-related securities:
FNMA/FHLMC761,410 — (111,600)649,810 
GNMA42,309 — (4,353)37,956 
Total HTM investment securities$3,570,901 $1,294 $(449,746)$3,122,449 
The amortized cost and fair values of AFS and HTM securities at December 31, 2025 were as follows:
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)$3,063 $1 $(20)$3,044 
Residential mortgage-related securities:
FNMA/FHLMC134,142 1,214 (5,493)129,863 
GNMA5,000,015 40,067 (253)5,039,829 
Commercial mortgage-related securities:
FNMA/FHLMC17,959 — (1,001)16,958 
GNMA113,374 — (3,818)109,556 
Asset backed securities:
FFELP95,977 19 (950)95,046 
SBA283 — (14)269 
Other debt securities3,000 — (2)2,998 
Total AFS investment securities$5,367,813 $41,301 $(11,551)$5,397,563 
HTM investment securities
U.S. Treasury securities$996 $19 $— $1,015 
Obligations of state and political subdivisions (municipal securities)1,628,088 3,070 (123,856)1,507,302 
Residential mortgage-related securities:
FNMA/FHLMC823,630 165 (127,333)696,462 
GNMA39,123 82 (2,321)36,884 
Private-label302,817 — (43,990)258,827 
Commercial mortgage-related securities:
FNMA/FHLMC763,370 — (113,004)650,366 
GNMA44,552 152 (4,566)40,138 
 Total HTM investment securities$3,602,576 $3,488 $(415,070)$3,190,994 
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of AFS and HTM securities at March 31, 2026, are shown below:
 AFSHTM
(in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$1,000 $1,000 $647,686 $644,429 
Due after one year through five years4,430 4,421 1,862 1,767 
Due after five years through ten years— — 7,298 7,103 
Due after ten years633 597 963,072 810,615 
Total municipal, U.S. Treasury and other debt securities6,063 6,018 1,619,918 1,463,914 
Residential mortgage-related securities:
FNMA/FHLMC136,572 131,583 811,047 681,846 
GNMA5,091,918 5,096,659 38,021 35,689 
Private-label— — 298,196 253,234 
Commercial mortgage-related securities:
FNMA/FHLMC17,864 16,936 761,410 649,810 
GNMA112,710 108,131 42,309 37,956 
Asset backed securities:
FFELP 92,852 91,828 — — 
SBA63,257 63,301 — — 
Total investment securities$5,521,236 $5,514,456 $3,570,901 $3,122,449 
Ratio of fair value to amortized cost99.9 %87.4 %
The following table summarizes gross realized gains and losses on AFS securities, the gain or loss on sale and fair value adjustment of equity securities, and proceeds from the sale of AFS investment securities:
Three Months Ended Mar 31,
(in thousands)20262025
Gross losses on HTM securities(4)— 
Fair value adjustment of equity securities(24)4 
Investment securities (losses) gains, net$(28)$4 
Investment securities with a carrying value of $1.2 billion at both March 31, 2026 and December 31, 2025 were pledged as required to secure certain deposits or for other purposes.
Accrued interest receivable on HTM securities totaled $15.3 million and $17.7 million at March 31, 2026 and December 31, 2025, respectively. Accrued interest receivable on AFS securities totaled $22.8 million and $23.0 million at March 31, 2026 and December 31, 2025, respectively. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets.
The Corporation holds U.S. Treasury, municipal, and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and private-label residential mortgage-related securities that have credit enhancement which covers the first 16% of losses and, as a result, no allowance for credit losses has been recorded related to these securities.
The allowance for credit losses on HTM securities was $0.1 million at both March 31, 2026 and December 31, 2025, attributable entirely to the Corporation's municipal securities, included in HTM investment securities, net, at amortized cost on the consolidated balance sheets.

The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2026:
 Less than 12 months12 months or moreTotal
(in thousands)Number
of
Securities		Unrealized
Losses		Fair
Value		Number
of
Securities		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)1 $(36)$597 1 $(8)$242 $(44)$839 
Residential mortgage-related securities:
FNMA/FHLMC28 (505)36,416 5 (5,376)45,914 (5,881)82,330 
GNMA91 (8,157)1,256,165 2 (32)1,915 (8,189)1,258,080 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (928)16,937 (928)16,937 
GNMA— — — 15 (4,579)108,132 (4,579)108,132 
Asset backed securities:
FFELP2 (92)28,630 12 (944)53,560 (1,036)82,190 
SBA1 (183)26,816 1 (4)73 (187)26,889 
Other debt securities2 (2)1,998 — — — (2)1,998 
Total125 $(8,975)$1,350,622 37 $(11,871)$226,773 $(20,846)$1,577,395 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)455 $(17,977)$636,009 407 $(139,250)$594,738 $(157,227)$1,230,747 
Residential mortgage-related securities:
FNMA/FHLMC17 (125)14,542 96 (129,114)655,718 (129,239)670,260 
GNMA2 (39)3,980 79 (2,326)27,441 (2,365)31,421 
Private-label— — — 18 (44,962)253,234 (44,962)253,234 
 Commercial mortgage-related securities:
FNMA/FHLMC2 (321)26,403 43 (111,279)623,406 (111,600)649,809 
GNMA— — — 13 (4,353)37,956 (4,353)37,956 
Total476 $(18,462)$680,934 656 $(431,284)$2,192,493 $(449,746)$2,873,427 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2025:
 Less than 12 months12 months or moreTotal
(in thousands)Number
of
Securities		Unrealized
Losses		Fair
Value		Number
of
Securities		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value
AFS investment securities
Obligations of state and political subdivisions (municipal securities)— $— $— 2 $(20)$863 $(20)$863 
Residential mortgage-related securities:
FNMA/FHLMC12 (95)14,155 12 (5,398)56,215 (5,493)70,370 
GNMA16 (232)143,734 3 (21)2,674 (253)146,408 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,001)16,958 (1,001)16,958 
GNMA— — — 15 (3,818)109,556 (3,818)109,556 
Asset backed securities:
FFELP2 (152)33,239 12 (798)55,565 (950)88,804 
SBA— — — 2 (14)231 (14)231 
Other debt securities2 (2)1,998 — — — (2)1,998 
Total32 $(481)$193,126 47 $(11,070)$242,062 $(11,551)$435,188 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)81 $(2,978)$89,826 543 $(120,878)$842,485 $(123,856)$932,311 
Residential mortgage-related securities:
FNMA/FHLMC1 — 30 102 (127,333)676,915 (127,333)676,945 
GNMA— — — 80 (2,321)30,237 (2,321)30,237 
Private-label— — — 18 (43,990)258,827 (43,990)258,827 
Commercial mortgage-related securities:
FNMA/FHLMC2 (470)26,287 43 (112,534)624,079 (113,004)650,366 
GNMA— — — 13 (4,566)40,138 (4,566)40,138 
Total84 $(3,448)$116,143 799 $(411,622)$2,472,681 $(415,070)$2,588,824 
On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The Company monitors the credit quality of HTM securities through credit ratings provided by S&P and Moody’s. Investment grade securities are rated BBB- or higher by S&P, or Baa3 or higher by Moody’s, and are generally considered by the rating agencies and market participants to be of low credit risk. As of March 31, 2026 and December 31, 2025, the Corporation's HTM portfolio contained all investment grade securities except for securities that were not rated which were individually reviewed noting no credit quality issues.
Based on the Corporation’s evaluation, management does not believe any unrealized losses at March 31, 2026 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. As of March 31, 2026, the Corporation does not intend to sell, nor does it believe that it will be required to sell, the securities in an unrealized loss position before recovery of their amortized cost basis.
Regulatory stocks: The Corporation had FHLB stock of $192.1 million and $154.4 million at March 31, 2026 and December 31, 2025, respectively. The Corporation had Federal Reserve Bank stock of $98.1 million at both March 31, 2026 and December 31, 2025.
Accrued interest receivable on FHLB stock totaled $3.6 million at March 31, 2026 and $2.8 million at December 31, 2025. There was $1.0 million accrued interest receivable on Federal Reserve Bank Stock at March 31, 2026 and none at December 31, 2025. Accrued interest receivable on both FHLB stock and Federal Reserve Bank stock is included in interest receivable on the consolidated balance sheets.
Equity Securities
Equity securities with readily determinable fair values: The Corporation's portfolio of equity securities with readily determinable fair values is primarily comprised of mutual funds. The Corporation had equity securities with readily determinable fair values of $11.1 million at March 31, 2026 and December 31, 2025.
Equity securities without readily determinable fair values: The Corporation's portfolio of equity securities without readily determinable fair values primarily consists of an investment in a private loan fund. The Corporation had equity securities without readily determinable fair values carried at $15.0 million at March 31, 2026 and December 31, 2025.