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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investment securities available for sale The amortized cost and fair values of securities available for sale and held to maturity at September 30, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
U. S. Treasury securities$26,541 $108 $— $26,650 
Agency securities24,983 50 — 25,033 
Obligations of state and political subdivisions (municipal securities)450,174 24,521 — 474,695 
Residential mortgage-related securities
FNMA / FHLMC1,267,003 9,554 (94)1,276,463 
GNMA399,490 7,823 — 407,313 
Commercial mortgage-related securities
FNMA / FHLMC19,724 2,153 — 21,877 
GNMA670,573 17,805 — 688,378 
Asset backed securities
FFELP332,398 — (6,556)325,843 
SBA9,159 — (48)9,111 
Other debt securities3,000 — (3)2,997 
Total investment securities available for sale$3,203,046 $62,015 $(6,701)$3,258,360 
Investment securities held to maturity
U. S. Treasury securities$999 $31 $— $1,030 
Obligations of state and political subdivisions (municipal securities)1,444,325 115,343 (368)1,559,300 
Residential mortgage-related securities
FNMA / FHLMC63,142 3,147 — 66,289 
GNMA159,455 5,217 — 164,672 
Commercial mortgage-related securities
FNMA/FHLMC11,220 — — 11,220 
GNMA311,798 10,142 — 321,941 
Total investment securities held to maturity$1,990,940 $133,880 $(368)$2,124,452 
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
Obligations of state and political subdivisions (municipal securities)$529,908 $16,269 $(18)$546,160 
Residential mortgage-related securities
FNMA / FHLMC131,158 1,562 (59)132,660 
GNMA982,941 3,887 (1,689)985,139 
Commercial mortgage-related securities
FNMA / FHLMC19,929 1,799 — 21,728 
GNMA1,314,836 7,403 (12,032)1,310,207 
FFELP asset backed securities270,178 — (6,485)263,693 
Other debt securities3,000 — — 3,000 
Total investment securities available for sale$3,251,950 $30,920 $(20,284)$3,262,586 
Investment securities held to maturity
U. S. Treasury securities$999 $19 $— $1,018 
Obligations of state and political subdivisions (municipal securities)1,418,569 69,775 (1,118)1,487,227 
Residential mortgage-related securities
FNMA / FHLMC81,676 1,759 (15)83,420 
GNMA269,523 1,882 (1,108)270,296 
GNMA commercial mortgage-related securities434,317 6,308 (6,122)434,503 
Total investment securities held to maturity$2,205,083 $79,744 $(8,363)$2,276,465 
Investment securities held to maturity The amortized cost and fair values of securities available for sale and held to maturity at September 30, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
U. S. Treasury securities$26,541 $108 $— $26,650 
Agency securities24,983 50 — 25,033 
Obligations of state and political subdivisions (municipal securities)450,174 24,521 — 474,695 
Residential mortgage-related securities
FNMA / FHLMC1,267,003 9,554 (94)1,276,463 
GNMA399,490 7,823 — 407,313 
Commercial mortgage-related securities
FNMA / FHLMC19,724 2,153 — 21,877 
GNMA670,573 17,805 — 688,378 
Asset backed securities
FFELP332,398 — (6,556)325,843 
SBA9,159 — (48)9,111 
Other debt securities3,000 — (3)2,997 
Total investment securities available for sale$3,203,046 $62,015 $(6,701)$3,258,360 
Investment securities held to maturity
U. S. Treasury securities$999 $31 $— $1,030 
Obligations of state and political subdivisions (municipal securities)1,444,325 115,343 (368)1,559,300 
Residential mortgage-related securities
FNMA / FHLMC63,142 3,147 — 66,289 
GNMA159,455 5,217 — 164,672 
Commercial mortgage-related securities
FNMA/FHLMC11,220 — — 11,220 
GNMA311,798 10,142 — 321,941 
Total investment securities held to maturity$1,990,940 $133,880 $(368)$2,124,452 
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
Obligations of state and political subdivisions (municipal securities)$529,908 $16,269 $(18)$546,160 
Residential mortgage-related securities
FNMA / FHLMC131,158 1,562 (59)132,660 
GNMA982,941 3,887 (1,689)985,139 
Commercial mortgage-related securities
FNMA / FHLMC19,929 1,799 — 21,728 
GNMA1,314,836 7,403 (12,032)1,310,207 
FFELP asset backed securities270,178 — (6,485)263,693 
Other debt securities3,000 — — 3,000 
Total investment securities available for sale$3,251,950 $30,920 $(20,284)$3,262,586 
Investment securities held to maturity
U. S. Treasury securities$999 $19 $— $1,018 
Obligations of state and political subdivisions (municipal securities)1,418,569 69,775 (1,118)1,487,227 
Residential mortgage-related securities
FNMA / FHLMC81,676 1,759 (15)83,420 
GNMA269,523 1,882 (1,108)270,296 
GNMA commercial mortgage-related securities434,317 6,308 (6,122)434,503 
Total investment securities held to maturity$2,205,083 $79,744 $(8,363)$2,276,465 
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities available for sale and held to maturity at September 30, 2020 are shown below:
 Available for SaleHeld to Maturity
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$8,343 $8,350 $28,957 $29,140 
Due after one year through five years82,198 82,964 63,630 65,751 
Due after five years through ten years344,172 362,247 161,769 170,223 
Due after ten years69,987 75,815 1,190,968 1,295,217 
Total debt securities504,699 529,375 1,445,325 1,560,331 
Residential mortgage-related securities
FNMA / FHLMC1,267,003 1,276,463 63,142 66,289 
GNMA399,490 407,313 159,455 164,672 
Commercial mortgage-related securities
FNMA / FHLMC19,724 21,877 11,220 11,220 
GNMA670,573 688,378 311,798 321,941 
Asset backed securities
FFELP 332,398 325,843 — — 
SBA9,159 9,111 — — 
Total investment securities$3,203,046 $3,258,360 $1,990,940 $2,124,452 
Ratio of fair value to amortized cost101.7 %106.7 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of held to maturity securities at amortized cost at September 30, 2020:
($ in Thousands)AAAAAATotal
U. S. Treasury securities$999 $— $— $999 
Obligations of state and political subdivisions (municipal securities)567,468 860,465 16,393 1,444,325 
Residential mortgage-related securities
FNMA/FHLMC63,142 — — 63,142 
GNMA159,455 — — 159,455 
Commercial mortgage-related securities
FNMA/FHLMC11,220 — — 11,220 
GNMA 311,798 — — 311,798 
Total held to maturity securities$1,114,082 $860,465 $16,393 $1,990,940 
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three and nine months ended September 30, 2020 and 2019 are shown below:
Three Months Ended September 30,Nine Months Ended September 30,
($ in Thousands)2020201920202019
Gross gains on available for sale securities$7 $4,013 $9,312 $6,347 
Gross gains on held to maturity securities— — — — 
Total gains7 4,013 9,312 6,347 
Gross (losses) on available for sale securities— (225)(90)(13,861)
Gross (losses) on held to maturity securities— — — — 
Total (losses)— (225)(90)(13,861)
Write-up of equity securities without readily determinable fair values— — — 13,444 
Investment securities gains (losses), net$7 $3,788 $9,222 $5,931 
Proceeds from sales of investment securities$8 $433,222 $626,283 $1,367,450 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2020:
 Less than 12 months12 months or moreTotal
($ in Thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
Investment securities available for sale
Residential mortgage-related securities
FNMA / FHLMC 5 $(94)$77,157 — $— $— $(94)$77,157 
GNMA1 — 424 — — — — 424 
Asset backed securities
FFELP5 (837)93,134 20 (5,719)232,709 (6,556)325,843 
SBA15 (48)8,953 — — — (48)8,953 
Other debt securities3 (3)2,997 — — — (3)2,997 
Total29 $(982)$182,665 20 $(5,719)$232,709 $(6,701)$415,374 
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)10 $(368)$25,895 — $— $— $(368)$25,895 
Total10 $(368)$25,895 — $— $— $(368)$25,895 
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019:
 Less than 12 months12 months or moreTotal
($ in Thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
Investment securities available for sale
Obligations of state and political subdivisions (municipal securities)4 $(18)$1,225 — $— $— $(18)$1,225 
Residential mortgage-related securities
FNMA / FHLMC— — — 4 (59)34,807 (59)34,807 
GNMA18 (924)322,394 3 (766)79,461 (1,689)401,856 
GNMA commercial mortgage-related securities22 (810)258,218 42 (11,222)621,307 (12,032)879,524 
FFELP asset backed securities19 (6,092)250,780 2 (393)12,913 (6,485)263,693 
Other debt securities2 — 2,000 — — — — 2,000 
Total65 $(7,843)$834,616 51 $(12,440)$748,487 $(20,284)$1,583,104 
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)52 $(1,105)$77,562 6 $(13)$2,378 $(1,118)$79,940 
Residential mortgage-related securities
FNMA / FHLMC1 (6)1,242 1 (9)833 (15)2,075 
GNMA12 (1,059)187,261 8 (49)6,587 (1,108)193,849 
GNMA commercial mortgage-related securities2 (29)26,202 21 (6,093)357,733 (6,122)383,935 
Total67 $(2,199)$292,267 36 $(6,164)$367,532 $(8,363)$659,799