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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Investment securities available for sale
Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of AFS and HTM securities at December 31, 2022 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$124,441 $— $(15,063)$109,378 
Agency securities15,000 — (1,468)13,532 
Obligations of state and political subdivisions (municipal securities)235,693 96 (5,074)230,714 
Residential mortgage-related securities
FNMA / FHLMC1,820,642 404 (216,436)1,604,610 
GNMA502,537 314 (5,255)497,596 
Commercial mortgage-related securities
FNMA / FHLMC19,038 — (1,896)17,142 
GNMA115,031 — (4,569)110,462 
Asset backed securities
FFELP157,138 — (5,947)151,191 
SBA4,512 15 (51)4,477 
Other debt securities3,000 — (78)2,922 
Total AFS investment securities$2,997,032 $830 $(255,837)$2,742,025 
HTM investment securities
U.S. Treasury securities$999 $— $(62)$936 
Obligations of state and political subdivisions (municipal securities)1,732,351 1,994 (182,697)1,551,647 
Residential mortgage-related securities
FNMA / FHLMC961,231 31,301 (175,760)816,771 
GNMA52,979 85 (3,436)49,628 
Private-label364,728 11,697 (72,920)303,505 
Commercial mortgage-related securities
FNMA/FHLMC778,796 15,324 (178,281)615,839 
GNMA69,369 577 (7,254)62,691 
Total HTM investment securities$3,960,451 $60,978 $(620,411)$3,401,018 
During the first quarter of 2022, the Corporation redesignated approximately $1.6 billion of mortgage-related securities from AFS to HTM. The reclassification of these investment securities was accounted for at fair value. Management elected to transfer these investment securities as the Corporation has the positive intent and ability to hold these investment securities to maturity. See Note 22 for additional information on the unrealized losses on investment securities transferred from AFS to HTM.
The amortized cost and fair values of AFS and HTM securities at December 31, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$124,291 $— $(1,334)$122,957 
Agency securities15,000 — (103)14,897 
Obligations of state and political subdivisions (municipal securities)381,517 18,940 — 400,457 
Residential mortgage-related securities
FNMA / FHLMC2,709,399 3,729 (21,249)2,691,879 
GNMA66,189 1,591 — 67,780 
Private-label332,028 31 (2,335)329,724 
Commercial mortgage-related securities
FNMA/FHLMC357,240 2,686 (9,302)350,623 
GNMA165,439 1,360 — 166,799 
Asset backed securities
   FFELP177,974 475 (1,123)177,325 
   SBA6,594 39 (54)6,580 
Other debt securities3,000 — (6)2,994 
Total AFS investment securities$4,338,671 $28,850 $(35,506)$4,332,015 
HTM investment securities
U.S. Treasury securities$1,000 $1 $— $1,001 
Obligations of state and political subdivisions (municipal securities)1,628,759 113,179 (1,951)1,739,988 
Residential mortgage-related securities
FNMA / FHLMC34,347 1,792 — 36,139 
GNMA48,053 1,578 — 49,631 
Commercial mortgage-related securities
FNMA / FHLMC425,937 122 (6,659)419,400 
GNMA100,907 1,799 (200)102,506 
Total HTM investment securities$2,239,003 $118,471 $(8,809)$2,348,664 
Investment securities held to maturity
Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of AFS and HTM securities at December 31, 2022 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$124,441 $— $(15,063)$109,378 
Agency securities15,000 — (1,468)13,532 
Obligations of state and political subdivisions (municipal securities)235,693 96 (5,074)230,714 
Residential mortgage-related securities
FNMA / FHLMC1,820,642 404 (216,436)1,604,610 
GNMA502,537 314 (5,255)497,596 
Commercial mortgage-related securities
FNMA / FHLMC19,038 — (1,896)17,142 
GNMA115,031 — (4,569)110,462 
Asset backed securities
FFELP157,138 — (5,947)151,191 
SBA4,512 15 (51)4,477 
Other debt securities3,000 — (78)2,922 
Total AFS investment securities$2,997,032 $830 $(255,837)$2,742,025 
HTM investment securities
U.S. Treasury securities$999 $— $(62)$936 
Obligations of state and political subdivisions (municipal securities)1,732,351 1,994 (182,697)1,551,647 
Residential mortgage-related securities
FNMA / FHLMC961,231 31,301 (175,760)816,771 
GNMA52,979 85 (3,436)49,628 
Private-label364,728 11,697 (72,920)303,505 
Commercial mortgage-related securities
FNMA/FHLMC778,796 15,324 (178,281)615,839 
GNMA69,369 577 (7,254)62,691 
Total HTM investment securities$3,960,451 $60,978 $(620,411)$3,401,018 
During the first quarter of 2022, the Corporation redesignated approximately $1.6 billion of mortgage-related securities from AFS to HTM. The reclassification of these investment securities was accounted for at fair value. Management elected to transfer these investment securities as the Corporation has the positive intent and ability to hold these investment securities to maturity. See Note 22 for additional information on the unrealized losses on investment securities transferred from AFS to HTM.
The amortized cost and fair values of AFS and HTM securities at December 31, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
AFS investment securities
U.S. Treasury securities$124,291 $— $(1,334)$122,957 
Agency securities15,000 — (103)14,897 
Obligations of state and political subdivisions (municipal securities)381,517 18,940 — 400,457 
Residential mortgage-related securities
FNMA / FHLMC2,709,399 3,729 (21,249)2,691,879 
GNMA66,189 1,591 — 67,780 
Private-label332,028 31 (2,335)329,724 
Commercial mortgage-related securities
FNMA/FHLMC357,240 2,686 (9,302)350,623 
GNMA165,439 1,360 — 166,799 
Asset backed securities
   FFELP177,974 475 (1,123)177,325 
   SBA6,594 39 (54)6,580 
Other debt securities3,000 — (6)2,994 
Total AFS investment securities$4,338,671 $28,850 $(35,506)$4,332,015 
HTM investment securities
U.S. Treasury securities$1,000 $1 $— $1,001 
Obligations of state and political subdivisions (municipal securities)1,628,759 113,179 (1,951)1,739,988 
Residential mortgage-related securities
FNMA / FHLMC34,347 1,792 — 36,139 
GNMA48,053 1,578 — 49,631 
Commercial mortgage-related securities
FNMA / FHLMC425,937 122 (6,659)419,400 
GNMA100,907 1,799 (200)102,506 
Total HTM investment securities$2,239,003 $118,471 $(8,809)$2,348,664 
Amortized cost and fair values of investment securities available for sale and held to maturity by contractual maturity Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of AFS and HTM securities at December 31, 2022, are shown below:
 AFSHTM
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$6,245 $6,230 $17,660 $17,621 
Due after one year through five years86,971 81,271 30,135 29,842 
Due after five years through ten years248,453 233,565 156,937 154,046 
Due after ten years36,465 35,480 1,528,616 1,351,075 
Total debt securities378,134 356,546 1,733,349 1,552,584 
Residential mortgage-related securities
FNMA / FHLMC1,820,642 1,604,610 961,231 816,771 
GNMA502,537 497,596 52,979 49,628 
Private-label— — 364,728 303,505 
Commercial mortgage-related securities
FNMA / FHLMC19,038 17,142 778,796 615,839 
GNMA115,031 110,462 69,369 62,691 
Asset backed securities
FFELP157,138 151,191 — — 
SBA4,512 4,477 — — 
Total investment securities$2,997,032 $2,742,025 $3,960,451 $3,401,018 
Ratio of Fair Value to Amortized Cost91.5 %85.9 %
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]
On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2022:
($ in Thousands)AAAAAANot RatedTotal
U.S. Treasury securities$999 $— $— $— $999 
Obligations of state and political subdivisions (municipal securities)806,529 917,059 7,604 1,158 1,732,351 
Residential mortgage-related securities
FNMA/FHLMC961,231 — — — 961,231 
GNMA52,979 — — — 52,979 
Private-label364,728 — — — 364,728 
Commercial mortgage-related securities
FNMA/FHLMC778,796 — — — 778,796 
GNMA69,369 — — — 69,369 
Total HTM securities$3,034,630 $917,059 $7,604 $1,158 $3,960,451 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2021:
($ in Thousands)AAAAAANot RatedTotal
U.S. Treasury securities$1,000 $— $— $— $1,000 
Obligations of state and political subdivisions (municipal securities)702,399 914,591 10,873 896 1,628,759 
Residential mortgage-related securities
FNMA/FHLMC34,347 — — — 34,347 
GNMA48,053 — — — 48,053 
Commercial mortgage-related securities
FNMA/FHLMC425,937 — — — 425,937 
GNMA100,907 — — — 100,907 
Total HTM securities$1,312,642 $914,591 $10,873 $896 $2,239,003 
Realized gains and losses and proceeds from sale The following table summarizes gross realized gains and losses on AFS securities, the gain on sale and net write-up of equity securities, and proceeds from the sale of investment securities for each of the three years ended December 31 shown below:
($ in Thousands)202220212020
Gross gains on AFS securities$21 $421 $9,312 
Gross (losses) on AFS securities(1,943)(437)(90)
Gain on sale and net write-up of equity securities5,668 — — 
Investment securities gains (losses), net$3,746 $(16)$9,222 
Proceeds from sales of AFS investment securities$110,177 $158,708 $626,283 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2022:
 Less than 12 months12 months or moreTotal
($ 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— $— $— 7 $(15,063)$109,378 $(15,063)$109,378 
Agency securities— — — 1 (1,468)13,532 (1,468)13,532 
Obligations of state and political subdivisions (municipal securities)358 (5,066)201,260 4 (8)1,916 (5,074)203,176 
Residential mortgage-related securities
FNMA / FHLMC24 (31,266)260,986 84 (185,170)1,321,420 (216,436)1,582,406 
GNMA23 (4,415)220,276 2 (840)11,096 (5,255)231,372 
Commercial mortgage-related securities
FNMA / FHLMC1 (1,896)17,142 — — — (1,896)17,142 
GNMA33 (3,920)101,036 4 (649)9,426 (4,569)110,462 
Asset backed securities
FFELP3 (1,668)44,304 12 (4,278)106,887 (5,947)151,191 
SBA2 (1)417 6 (50)2,057 (51)2,474 
Other debt securities2 (30)1,970 1 (49)951 (78)2,922 
Total446 $(48,263)$847,391 121 $(207,575)$1,576,665 $(255,837)$2,424,055 
HTM investment securities
U.S. Treasury securities1 $(62)$936 — $— $— $(62)$936 
Obligations of state and political subdivisions (municipal securities)771 (96,282)1,079,216 156 (86,415)231,022 (182,697)1,310,238 
Residential mortgage-related securities
FNMA / FHLMC79 (18,925)143,201 22 (156,836)671,570 (175,760)814,770 
GNMA 81 (3,436)44,476 — — — (3,436)44,476 
Private-label3 (9,509)58,733 15 (63,411)244,772 (72,920)303,505 
Commercial mortgage-related securities
FNMA / FHLMC4 (3,814)20,338 39 (174,467)576,911 (178,281)597,249 
GNMA8 (2,528)34,612 6 (4,726)28,080 (7,254)62,691 
Total947 $(134,556)$1,381,511 238 $(485,855)$1,752,354 $(620,411)$3,133,865 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2021:
 Less than 12 months12 months or moreTotal
($ 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 securities7 $(1,334)$122,957 — $— $— $(1,334)$122,957 
Agency securities1 (103)14,897 — — — (103)14,897 
Residential mortgage-related securities
FNMA / FHLMC74 (21,249)2,172,837 — — — (21,249)2,172,837 
Private-label12 (2,335)248,617 — — — (2,335)248,617 
FNMA / FHLMC commercial mortgage-related securities19 (9,302)328,568 — — — (9,302)328,568 
Asset backed securities
FFELP4 (256)64,282 8 (867)62,576 (1,123)126,858 
SBA— — — 9 (54)3,902 (54)3,902 
Other debt securities3 (6)2,994 — — — (6)2,994 
Total120 $(34,586)$2,955,152 17 $(920)$66,478 $(35,506)$3,021,630 
HTM investment securities
Obligations of state and political subdivisions (municipal securities)49 $(1,951)$112,038 — $— $— $(1,951)$112,038 
Commercial mortgage-related securities
FNMA/FHLMC18 (6,272)388,072 1 (387)10,775 (6,659)398,847 
GNMA5 (200)33,468 — — — (200)33,468 
Total72 $(8,422)$533,577 1 $(387)$10,775 $(8,809)$544,352