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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets. 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)$3,185,494 
The amortized cost and fair values of AFS and HTM securities at December 31, 2023 were as follows:
($ in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$39,984 $— $(4,083)$35,902 
Obligations of state and political subdivisions (municipal securities)94,008 23 (2,214)91,817 
Residential mortgage-related securities:
FNMA/FHLMC1,274,052 294 (153,552)1,120,794 
GNMA2,021,242 24,254 (2,822)2,042,675 
Commercial mortgage-related securities:
FNMA/FHLMC18,691 — (1,755)16,937 
GNMA161,928 — (7,135)154,793 
Asset backed securities:
   FFELP135,832 5 (1,862)133,975 
   SBA1,077 2 (28)1,051 
Other debt securities3,000 — (50)2,950 
Total AFS investment securities$3,749,814 $24,579 $(173,501)$3,600,892 
HTM investment securities
U.S. Treasury securities$999 $— $(36)$963 
Obligations of state and political subdivisions (municipal securities)1,682,473 5,638 (134,053)1,554,059 
Residential mortgage-related securities:
FNMA/FHLMC941,973 27,007 (164,587)804,393 
GNMA48,979 92 (2,901)46,170 
Private-label345,083 9,796 (65,372)289,507 
Commercial mortgage-related securities:
FNMA/FHLMC780,995 12,699 (160,781)632,914 
GNMA59,733 386 (7,500)52,619 
Total HTM investment securities$3,860,235 $55,619 $(535,230)$3,380,624 
Debt Securities, Held-to-Maturity [Table Text Block]
Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets. The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
($ 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)$3,185,494 
The amortized cost and fair values of AFS and HTM securities at December 31, 2023 were as follows:
($ in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$39,984 $— $(4,083)$35,902 
Obligations of state and political subdivisions (municipal securities)94,008 23 (2,214)91,817 
Residential mortgage-related securities:
FNMA/FHLMC1,274,052 294 (153,552)1,120,794 
GNMA2,021,242 24,254 (2,822)2,042,675 
Commercial mortgage-related securities:
FNMA/FHLMC18,691 — (1,755)16,937 
GNMA161,928 — (7,135)154,793 
Asset backed securities:
   FFELP135,832 5 (1,862)133,975 
   SBA1,077 2 (28)1,051 
Other debt securities3,000 — (50)2,950 
Total AFS investment securities$3,749,814 $24,579 $(173,501)$3,600,892 
HTM investment securities
U.S. Treasury securities$999 $— $(36)$963 
Obligations of state and political subdivisions (municipal securities)1,682,473 5,638 (134,053)1,554,059 
Residential mortgage-related securities:
FNMA/FHLMC941,973 27,007 (164,587)804,393 
GNMA48,979 92 (2,901)46,170 
Private-label345,083 9,796 (65,372)289,507 
Commercial mortgage-related securities:
FNMA/FHLMC780,995 12,699 (160,781)632,914 
GNMA59,733 386 (7,500)52,619 
Total HTM investment securities$3,860,235 $55,619 $(535,230)$3,380,624 
Investments Classified by Contractual Maturity Date [Table Text Block]
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of AFS and HTM securities at December 31, 2024, are shown below:
 AFSHTM
($ in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$1,000 $997 $17,800 $17,746 
Due after one year through five years3,040 3,026 62,054 61,286 
Due after five years through ten years1,390 1,387 187,803 179,653 
Due after ten years633 585 1,393,065 1,228,957 
Total debt securities6,063 5,994 1,660,722 1,487,641 
Residential mortgage-related securities:
FNMA/FHLMC120,272 110,928 885,476 721,946 
GNMA4,236,199 4,227,727 43,693 39,927 
Private-label— — 324,182 266,353 
Commercial mortgage-related securities:
FNMA/FHLMC18,332 17,000 772,456 623,595 
GNMA116,275 111,475 52,219 46,032 
Asset backed securities:
FFELP108,319 107,839 — — 
SBA495 471 — — 
Total investment securities$4,605,954 $4,581,434 $3,738,747 $3,185,494 
Ratio of fair value to amortized cost99.5 %85.2 %
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block]
On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2024:
($ 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 
GNMA52,219 — — — 52,219 
Total HTM securities$2,846,177 $883,438 $4,911 $4,221 $3,738,747 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2023:
($ in thousands)AAAAAANot RatedTotal
U.S. Treasury securities$999 $— $— $— $999 
Obligations of state and political subdivisions (municipal securities)760,329 915,303 5,687 1,155 1,682,473 
Residential mortgage-related securities:
FNMA/FHLMC941,973 — — — 941,973 
GNMA48,979 — — — 48,979 
Private-label345,083 — — — 345,083 
Commercial mortgage-related securities:
FNMA/FHLMC780,995 — — — 780,995 
GNMA59,733 — — — 59,733 
Total HTM securities$2,938,090 $915,303 $5,687 $1,155 $3,860,235 
Schedule of Realized Gain (Loss) [Table Text Block]
The following table summarizes gross realized gains and losses on AFS securities, the gain on sale and net write-up of equity securities, and proceeds from the sale of AFS investment securities for each of the three years ended December 31 shown below:
($ in thousands)202420232022
Gross realized gains on AFS securities$— $83 $21 
Gross realized (losses) on AFS securities(148,380)(65,022)(1,943)
Gain on sale and net write-up of equity securities4,233 6,037 5,668 
Investment securities (losses) gains, net$(144,147)$(58,903)$3,746 
Proceeds from sales of AFS investment securities$1,141,231 $715,066 $110,177 
Schedule of Unrealized Loss on Investments [Table Text Block]
The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2024:
 Less than 12 months12 months or moreTotal
($ 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 
GNMA 7 (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)$3,048,660 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2023:
 Less than 12 months12 months or moreTotal
($ in thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
AFS investment securities
U.S. Treasury securities— $— $— 1 $(4,083)$35,902 $(4,083)$35,902 
Obligations of state and political subdivisions (municipal securities)41 (347)23,762 92 (1,867)53,022 (2,214)76,784 
Residential mortgage-related securities:
FNMA/FHLMC18 (333)22,870 71 (153,219)1,080,337 (153,552)1,103,207 
GNMA13 (924)156,847 5 (1,898)26,643 (2,822)183,490 
Commercial mortgage-related securities:
FNMA/FHLMC— — — 1 (1,755)16,937 (1,755)16,937 
GNMA9 (3,160)103,055 22 (3,975)51,738 (7,135)154,793 
Asset backed securities:
FFELP— — — 14 (1,862)125,339 (1,862)125,339 
SBA— — — 5 (28)761 (28)761 
Other debt securities1 (9)991 2 (42)1,958 (50)2,950 
Total82 $(4,773)$307,527 213 $(168,728)$1,392,635 $(173,501)$1,700,162 
HTM investment securities
U.S. Treasury securities— $— $— 1 $(36)$963 $(36)$963 
Obligations of state and political subdivisions (municipal securities)182 (1,535)180,270 537 (132,518)792,940 (134,053)973,210 
Residential mortgage-related securities:
FNMA/FHLMC20 (511)30,323 94(164,076)771,042 (164,587)801,365 
GNMA2 (17)2,128 78 (2,884)34,626 (2,901)36,754 
Private-label— — — 18(65,372)289,507 (65,372)289,507 
Commercial mortgage-related securities:
FNMA/FHLMC1 (121)8,144 44 (160,660)624,770 (160,781)632,914 
GNMA— — — 13 (7,500)52,619 (7,500)52,619 
Total205 $(2,184)$220,865 785 $(533,046)$2,566,468 $(535,230)$2,787,333