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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2025
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 March 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 $— $(68)$2,995 
Residential mortgage-related securities:
FNMA/FHLMC125,024 486 (7,474)118,036 
GNMA4,418,218 22,659 (1,913)4,438,964 
Commercial mortgage-related securities:
FNMA/FHLMC18,240 — (1,281)16,959 
GNMA115,654 — (4,221)111,433 
Asset backed securities:
FFELP105,633 52 (911)104,774 
SBA427 — (17)410 
Other debt securities3,000 — (1)2,999 
Total AFS investment securities$4,789,259 $23,197 $(15,885)$4,796,570 
HTM investment securities
U.S. Treasury securities$994 $15 $— $1,009 
Obligations of state and political subdivisions (municipal securities)1,649,045 662 (194,901)1,454,805 
Residential mortgage-related securities:
FNMA/FHLMC871,331 21,973 (169,482)723,822 
GNMA42,972 14 (3,009)39,977 
Private-label320,057 7,786 (59,642)268,201 
Commercial mortgage-related securities:
FNMA/FHLMC770,177 9,765 (139,208)640,734 
GNMA51,281 218 (5,877)45,621 
Total HTM investment securities$3,705,857 $40,432 $(572,119)$3,174,170 
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
($ 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 $— $(58)$3,005 
Residential mortgage-related securities:
FNMA/FHLMC120,272 190 (9,534)110,928 
GNMA4,236,199 5,379 (13,851)4,227,727 
Commercial mortgage-related securities:
FNMA/FHLMC18,332 — (1,332)17,000 
GNMA116,275 — (4,800)111,475 
Asset backed securities:
FFELP108,319 123 (604)107,839 
SBA495 — (24)471 
Other debt securities3,000 — (11)2,989 
Total AFS investment securities$4,605,954 $5,693 $(30,213)$4,581,434 
HTM investment securities
U.S. Treasury securities$1,000 $— $(1)$999 
Obligations of state and political subdivisions (municipal securities)1,659,722 1,122 (174,202)1,486,642 
Residential mortgage-related securities:
FNMA/FHLMC885,476 22,934 (186,464)721,946 
GNMA43,693 9 (3,774)39,927 
Private-label324,182 8,135 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC772,456 10,217 (159,078)623,595 
GNMA52,219 236 (6,424)46,032 
 Total HTM investment securities$3,738,747 $42,653 $(595,906)$3,185,494 
Debt Securities, Held-to-Maturity [Table Text Block] The amortized cost and fair values of AFS and HTM securities at March 31, 2025 were as follows:
($ 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 $— $(68)$2,995 
Residential mortgage-related securities:
FNMA/FHLMC125,024 486 (7,474)118,036 
GNMA4,418,218 22,659 (1,913)4,438,964 
Commercial mortgage-related securities:
FNMA/FHLMC18,240 — (1,281)16,959 
GNMA115,654 — (4,221)111,433 
Asset backed securities:
FFELP105,633 52 (911)104,774 
SBA427 — (17)410 
Other debt securities3,000 — (1)2,999 
Total AFS investment securities$4,789,259 $23,197 $(15,885)$4,796,570 
HTM investment securities
U.S. Treasury securities$994 $15 $— $1,009 
Obligations of state and political subdivisions (municipal securities)1,649,045 662 (194,901)1,454,805 
Residential mortgage-related securities:
FNMA/FHLMC871,331 21,973 (169,482)723,822 
GNMA42,972 14 (3,009)39,977 
Private-label320,057 7,786 (59,642)268,201 
Commercial mortgage-related securities:
FNMA/FHLMC770,177 9,765 (139,208)640,734 
GNMA51,281 218 (5,877)45,621 
Total HTM investment securities$3,705,857 $40,432 $(572,119)$3,174,170 
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
($ 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 $— $(58)$3,005 
Residential mortgage-related securities:
FNMA/FHLMC120,272 190 (9,534)110,928 
GNMA4,236,199 5,379 (13,851)4,227,727 
Commercial mortgage-related securities:
FNMA/FHLMC18,332 — (1,332)17,000 
GNMA116,275 — (4,800)111,475 
Asset backed securities:
FFELP108,319 123 (604)107,839 
SBA495 — (24)471 
Other debt securities3,000 — (11)2,989 
Total AFS investment securities$4,605,954 $5,693 $(30,213)$4,581,434 
HTM investment securities
U.S. Treasury securities$1,000 $— $(1)$999 
Obligations of state and political subdivisions (municipal securities)1,659,722 1,122 (174,202)1,486,642 
Residential mortgage-related securities:
FNMA/FHLMC885,476 22,934 (186,464)721,946 
GNMA43,693 9 (3,774)39,927 
Private-label324,182 8,135 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC772,456 10,217 (159,078)623,595 
GNMA52,219 236 (6,424)46,032 
 Total HTM investment securities$3,738,747 $42,653 $(595,906)$3,185,494 
Investments Classified by Contractual Maturity Date [Table Text Block] The expected maturities of AFS and HTM securities at March 31, 2025, are shown below:
 AFSHTM
($ in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$1,000 $999 $11,023 $10,999 
Due after one year through five years3,040 3,034 74,907 74,159 
Due after five years through ten years1,390 1,385 216,847 207,000 
Due after ten years633 576 1,347,262 1,163,656 
Total debt securities6,063 5,995 1,650,039 1,455,814 
Residential mortgage-related securities:
FNMA/FHLMC125,024 118,036 871,331 723,822 
GNMA4,418,218 4,438,964 42,972 39,977 
Private-label— — 320,057 268,201 
Commercial mortgage-related securities:
FNMA/FHLMC18,240 16,959 770,177 640,734 
GNMA115,654 111,433 51,281 45,621 
Asset backed securities:
FFELP 105,633 104,774 — — 
SBA427 410 — — 
Total investment securities$4,789,259 $4,796,570 $3,705,857 $3,174,170 
Ratio of fair value to amortized cost100.2 %85.7 %
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] The following table summarizes the credit quality indicators of HTM securities at amortized cost at March 31, 2025:
($ in thousands)AAAAAANot RatedTotal
U.S. Treasury securities$994 $— $— $— $994 
Obligations of state and political subdivisions (municipal securities)761,576 876,276 3,920 7,273 1,649,045 
Residential mortgage-related securities:
FNMA/FHLMC871,331 — — — 871,331 
GNMA42,972 — — — 42,972 
Private-label320,057 — — — 320,057 
Commercial mortgage-related securities:
FNMA/FHLMC770,177 — — — 770,177 
GNMA 51,281 — — — 51,281 
Total HTM securities$2,818,388 $876,276 $3,920 $7,273 $3,705,857 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2024:
($ in thousands)AAAAAANot RatedTotal
U.S. Treasury securities$1,000 $— $— $— $1,000 
Obligations of state and political subdivisions (municipal securities)767,151 883,438 4,911 4,221 1,659,722 
Residential mortgage-related securities:
FNMA/FHLMC885,476 — — — 885,476 
GNMA43,693 — — — 43,693 
Private-label324,182 — — — 324,182 
Commercial mortgage-related securities:
FNMA/FHLMC772,456 — — — 772,456 
GNMA 52,219 — — — 52,219 
Total HTM securities$2,846,177 $883,438 $4,911 $4,221 $3,738,747 
Schedule of Realized Gain (Loss) [Table Text Block]
The following table summarizes gross realized gains and losses on AFS securities, the gain or loss on sale and fair value adjustment of equity securities, and proceeds from the sale of AFS investment securities:
Three Months Ended Mar 31,
($ in thousands)20252024
Gross realized (losses) on AFS securities$— $(197)
Gain on sale and fair value adjustment of equity securities4 4,076 
Investment securities gains, net$4 $3,879 
Proceeds from sales of AFS investment securities$— $9,472 
During the first quarter of 2024, the Corporation sold its remaining Visa Class B restricted shares at a gain of $4 million.
Schedule of Unrealized Loss on Investments [Table Text Block]
The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2025:
 Less than 12 months12 months or moreTotal
($ 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)1 $(5)$540 2 $(63)$820 $(68)1,360 
Residential mortgage-related securities:
FNMA/FHLMC17 (243)23,292 14 (7,231)61,639 (7,474)84,931 
GNMA32 (1,822)623,422 5 (91)4,967 (1,913)628,389 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,281)16,959 (1,281)16,959 
GNMA— — — 16 (4,221)111,433 (4,221)111,433 
Asset backed securities:
FFELP— — — 12 (911)60,939 (911)60,939 
SBA— — — 4 (17)399 (17)399 
Other debt securities1 — 1,000 1 (1)999 (1)1,999 
Total51 $(2,070)$648,254 55 $(13,815)$258,155 $(15,885)$906,409 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)369 $(15,784)$497,155 665 $(179,117)$876,233 $(194,901)$1,373,388 
Residential mortgage-related securities:
FNMA/FHLMC9 (122)9,717 106 (169,359)712,109 (169,482)721,825 
GNMA6 (77)7,474 79 (2,932)31,198 (3,009)38,671 
Private-label— — — 18 (59,642)268,201 (59,642)268,201 
 Commercial mortgage-related securities:
FNMA/FHLMC1 (178)8,091 43 (139,030)613,936 (139,208)622,027 
GNMA— — — 13 (5,877)45,621 (5,877)45,621 
Total385 $(16,161)$522,436 924 $(555,958)$2,547,298 $(572,119)$3,069,734 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2024:
 Less than 12 months12 months or moreTotal
($ 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 $(3)$542 2 $(55)$828 $(58)$1,370 
Residential mortgage-related securities:
FNMA/FHLMC23 (607)31,983 14 (8,927)61,596 (9,534)93,579 
GNMA116 (13,706)1,660,642 4 (145)3,945 (13,851)1,664,587 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,332)17,000 (1,332)17,000 
GNMA— — — 16 (4,800)111,475 (4,800)111,475 
Asset backed securities:
FFELP— — — 12 (604)62,830 (604)62,830 
SBA— — — 4 (24)464 (24)464 
Other debt securities1 (7)993 1 (3)997 (11)1,989 
Total141 $(14,323)$1,694,159 54 $(15,890)$259,134 $(30,213)$1,953,294 
HTM investment securities
U.S. Treasury securities— $— $— 1 $(1)$999 $(1)$999 
Obligations of state and political subdivisions (municipal securities)370 (11,860)483,073 641 (162,343)866,949 (174,202)1,350,022 
Residential mortgage-related securities:
FNMA/FHLMC12 (280)11,617 106 (186,184)710,114 (186,464)721,732 
GNMA7 (183)8,856 79 (3,591)31,071 (3,774)39,927 
Private-label— — — 18 (65,963)266,353 (65,963)266,353 
Commercial mortgage-related securities:
FNMA/FHLMC2 (1,343)25,518 43 (157,735)598,077 (159,078)623,595 
GNMA— — — 13 (6,424)46,032 (6,424)46,032 
Total391 $(13,665)$529,064 901 $(582,241)$2,519,595 $(595,906)$3,048,660