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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2026
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] The amortized cost and fair values of AFS and HTM securities at June 30, 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)$7,342 $4 $(106)$7,240 
Residential mortgage-related securities:
FNMA/FHLMC142,709 815 (6,236)137,288 
GNMA5,518,890 2,481 (29,723)5,491,648 
Commercial mortgage-related securities:
FNMA/FHLMC414,880 — (4,659)410,221 
GNMA111,910 — (5,066)106,844 
Asset backed securities:
FFELP89,197 1 (986)88,212 
SBA120,221 387 (538)120,070 
Other debt securities(a)
6,750 — (1,687)5,063 
Total AFS investment securities$6,411,899 $3,688 $(49,001)$6,366,586 
HTM investment securities
U.S. Treasury securities$997 $5 $— $1,002 
Obligations of state and political subdivisions (municipal securities)1,591,681 1,797 (124,874)1,468,604 
Residential mortgage-related securities:
FNMA/FHLMC790,729 39 (130,031)660,737 
GNMA37,215 18 (2,607)34,626 
Private-label292,007 — (45,547)246,460 
Commercial mortgage-related securities:
FNMA/FHLMC757,723 — (113,423)644,300 
GNMA40,423 — (4,334)36,089 
Total HTM investment securities$3,510,775 $1,859 $(420,816)$3,091,818 
(a)Unrealized losses includes allowance for credit losses
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 
Debt Securities, Held-to-Maturity [Table Text Block] The amortized cost and fair values of AFS and HTM securities at June 30, 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)$7,342 $4 $(106)$7,240 
Residential mortgage-related securities:
FNMA/FHLMC142,709 815 (6,236)137,288 
GNMA5,518,890 2,481 (29,723)5,491,648 
Commercial mortgage-related securities:
FNMA/FHLMC414,880 — (4,659)410,221 
GNMA111,910 — (5,066)106,844 
Asset backed securities:
FFELP89,197 1 (986)88,212 
SBA120,221 387 (538)120,070 
Other debt securities(a)
6,750 — (1,687)5,063 
Total AFS investment securities$6,411,899 $3,688 $(49,001)$6,366,586 
HTM investment securities
U.S. Treasury securities$997 $5 $— $1,002 
Obligations of state and political subdivisions (municipal securities)1,591,681 1,797 (124,874)1,468,604 
Residential mortgage-related securities:
FNMA/FHLMC790,729 39 (130,031)660,737 
GNMA37,215 18 (2,607)34,626 
Private-label292,007 — (45,547)246,460 
Commercial mortgage-related securities:
FNMA/FHLMC757,723 — (113,423)644,300 
GNMA40,423 — (4,334)36,089 
Total HTM investment securities$3,510,775 $1,859 $(420,816)$3,091,818 
(a)Unrealized losses includes allowance for credit losses
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 
Investments Classified by Contractual Maturity Date [Table Text Block] The expected maturities of AFS and HTM securities at June 30, 2026, are shown below:
AFSHTM
(in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$3,750 $2,063 $820,235 $818,331 
Due after one year through five years7,739 7,655 825 779 
Due after five years through ten years— — 8,078 7,932 
Due after ten years2,603 2,585 763,540 642,564 
Total municipal, U.S. Treasury and other debt securities14,092 12,303 1,592,678 1,469,606 
Residential mortgage-related securities:
FNMA/FHLMC142,709 137,288 790,729 660,737 
GNMA5,518,890 5,491,648 37,215 34,626 
Private-label— — 292,007 246,460 
Commercial mortgage-related securities:
FNMA/FHLMC414,880 410,221 757,723 644,300 
GNMA111,910 106,844 40,423 36,089 
Asset backed securities:
FFELP 89,197 88,212 — — 
SBA120,221 120,070 — — 
Total investment securities$6,411,899 $6,366,586 $3,510,775 $3,091,818 
Ratio of fair value to amortized cost99.3 %88.1 %
Schedule of Realized Gain (Loss) [Table Text Block]
The following table summarizes gross realized gains and losses on AFS securities, the gain or loss on sale and fair value adjustment of equity securities, and proceeds from the sale of AFS investment securities:
Three Months Ended Jun 30,Six Months Ended Jun 30,
(in thousands)2026202520262025
Gross losses on HTM securities$— $— $(4)$— 
Fair value adjustment of equity securities35 7 10 11 
Investment securities (losses) gains, net$35 $7 $6 $11 
Schedule of Unrealized Loss on Investments [Table Text Block]
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 June 30, 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)4 $(99)$4,176 1 $(7)$243 $(106)$4,419 
Residential mortgage-related securities:
FNMA/FHLMC34 (604)47,975 5 (5,632)44,189 (6,236)92,164 
GNMA236 (29,685)4,396,013 2 (38)1,901 (29,723)4,397,914 
Commercial mortgage-related securities:
FNMA/FHLMC11 (3,780)393,331 1 (879)16,889 (4,659)410,220 
GNMA— — — 15 (5,066)106,844 (5,066)106,844 
Asset backed securities:
FFELP2 (75)30,893 12 (911)51,501 (986)82,394 
SBA6 (526)89,501 2 (12)183 (538)89,684 
Other debt securities(a)
3 (1,687)4,062 — — — (1,687)4,062 
Total296 $(36,456)$4,965,951 38 $(12,545)$221,750 $(49,001)$5,187,701 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)327 $(6,876)$500,662 407 $(117,998)$615,514 $(124,874)$1,116,176 
Residential mortgage-related securities:
FNMA/FHLMC15 (127)15,968 100 (129,904)637,637 (130,031)653,605 
GNMA4 (60)5,330 79 (2,547)26,571 (2,607)31,901 
Private-label— — — 18 (45,547)246,460 (45,547)246,460 
 Commercial mortgage-related securities:
FNMA/FHLMC2 (536)26,155 43 (112,887)618,145 (113,423)644,300 
GNMA— — — 13 (4,334)36,088 (4,334)36,088 
Total348 $(7,599)$548,115 660 $(413,217)$2,180,415 $(420,816)$2,728,530 
(a)Unrealized losses includes allowance for credit losses
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