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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investment securities available for sale 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
Investment securities AFS
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 investment securities AFS$4,338,671 $28,850 $(35,506)$4,332,015 
Investment securities HTM
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 investment securities HTM$2,239,003 $118,471 $(8,809)$2,348,664 
The amortized cost and fair values of AFS and HTM securities at December 31, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U.S. Treasury securities$26,436 $95 $— $26,531 
Agency securities24,985 53 — 25,038 
Obligations of state and political subdivisions (municipal securities)425,057 25,605 — 450,662 
Residential mortgage-related securities:
FNMA / FHLMC1,448,806 12,935 (500)1,461,241 
GNMA231,364 4,176 (3)235,537 
Commercial mortgage-related securities
FNMA/FHLMC19,654 3,250 — 22,904 
GNMA511,429 13,327 — 524,756 
Asset backed securities
   FFELP329,030 1,172 (3,013)327,189 
   SBA8,637 — (53)8,584 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,028,399 $60,612 $(3,570)$3,085,441 
Investment securities HTM
U.S. Treasury securities$999 $25 $— $1,024 
Obligations of state and political subdivisions (municipal securities)1,441,900 133,544 — 1,575,445 
Residential mortgage-related securities
FNMA / FHLMC54,599 2,891 — 57,490 
GNMA114,553 4,260 — 118,813 
Commercial mortgage-related securities
FNMA / FHLMC11,211 — — 11,211 
GNMA255,742 9,218 — 264,960 
Total investment securities HTM$1,879,005 $149,938 $— $2,028,943 
Investment securities held to maturity The amortized cost and fair values of AFS and HTM securities at December 31, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
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 investment securities AFS$4,338,671 $28,850 $(35,506)$4,332,015 
Investment securities HTM
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 investment securities HTM$2,239,003 $118,471 $(8,809)$2,348,664 
The amortized cost and fair values of AFS and HTM securities at December 31, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U.S. Treasury securities$26,436 $95 $— $26,531 
Agency securities24,985 53 — 25,038 
Obligations of state and political subdivisions (municipal securities)425,057 25,605 — 450,662 
Residential mortgage-related securities:
FNMA / FHLMC1,448,806 12,935 (500)1,461,241 
GNMA231,364 4,176 (3)235,537 
Commercial mortgage-related securities
FNMA/FHLMC19,654 3,250 — 22,904 
GNMA511,429 13,327 — 524,756 
Asset backed securities
   FFELP329,030 1,172 (3,013)327,189 
   SBA8,637 — (53)8,584 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,028,399 $60,612 $(3,570)$3,085,441 
Investment securities HTM
U.S. Treasury securities$999 $25 $— $1,024 
Obligations of state and political subdivisions (municipal securities)1,441,900 133,544 — 1,575,445 
Residential mortgage-related securities
FNMA / FHLMC54,599 2,891 — 57,490 
GNMA114,553 4,260 — 118,813 
Commercial mortgage-related securities
FNMA / FHLMC11,211 — — 11,211 
GNMA255,742 9,218 — 264,960 
Total investment securities HTM$1,879,005 $149,938 $— $2,028,943 
Amortized cost and fair values of investment securities available for sale and held to maturity by contractual maturity
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of AFS and HTM securities at December 31, 2021, are shown below:
 AFSHTM
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$6,799 $6,809 $34,646 $34,842 
Due after one year through five years74,250 74,142 34,697 35,820 
Due after five years through ten years405,344 418,942 161,627 167,967 
Due after ten years37,416 41,412 1,398,789 1,502,359 
Total debt securities523,808 541,305 1,629,759 1,740,988 
Residential mortgage-related securities
FNMA / FHLMC2,709,399 2,691,879 34,347 36,139 
GNMA66,189 67,780 48,053 49,631 
Private-label332,028 329,724 — — 
Commercial mortgage-related securities
FNMA / FHLMC357,240 350,623 425,937 419,400 
GNMA165,439 166,799 100,907 102,506 
Asset backed securities
FFELP177,974 177,325 — — 
SBA6,594 6,580 — — 
Total investment securities$4,338,671 $4,332,015 $2,239,003 $2,348,664 
Ratio of Fair Value to Amortized Cost99.8 %104.9 %
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]
On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2021:
($ 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 $2,239,003 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020:
($ in Thousands)AAAAAATotal
U.S. Treasury securities$999 $— $— $999 
Obligations of state and political subdivisions (municipal securities)567,252 860,607 14,041 1,441,900 
Residential mortgage-related securities
FNMA/FHLMC54,599 — — 54,599 
GNMA114,553 — — 114,553 
Commercial mortgage-related securities
FNMA/FHLMC11,211 — — 11,211 
GNMA255,742 — — 255,742 
Total HTM securities$1,004,357 $860,607 $14,041 $1,879,005 
Realized gains and losses and proceeds from sale
Investment securities gains (losses), net includes proceeds from the sale of investment securities as well as any applicable write-ups or write-downs of investment securities. The proceeds from the sale and write-up of investment securities for each of the three years ended December 31 are shown below:
($ in Thousands)202120202019
Gross gains on AFS securities$421 $9,312 $6,374 
Gross (losses) on AFS securities(437)(90)(13,861)
Write-up of equity securities without readily determinable fair values— — 13,444 
Investment securities gains (losses), net$(16)$9,222 $5,957 
Proceeds from sales of investment securities$158,708 $626,283 $1,367,476 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2021:
 Less than 12 months12 months or moreTotal
($ in Thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized (Losses)Fair
Value
Investment securities AFS
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 
Investment securities HTM
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)$544,352 
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020:
 Less than 12 months12 months or moreTotal
($ in Thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
Investment securities AFS
Residential mortgage-related securities
FNMA / FHLMC7 $(500)$163,002 — $— $— $(500)$163,002 
GNMA2 (3)9,784 — — — (3)9,784 
GNMA commercial mortgage-related securities1 — 287 — — — — 287 
Asset backed securities
FFELP1 (129)9,267 16 (2,885)178,681 (3,013)187,948 
SBA14 (53)8,379 — — — (53)8,379 
Other debt securities2 — 2,000 — — — — 2,000 
Total27 $(685)$192,720 16 $(2,885)$178,681 $(3,570)$371,400 
Investment securities HTM
GNMA residential mortgage-related securities1 $— $325 — $— $— $— $325 
Total1 $— $325 — $— $— $— $325