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Investment Securities (Tables)
 6 Months Ended
Jun. 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 June 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$26,646  $88  $—  $26,735  
Agency securities24,982  25  —  25,007  
Obligations of state and political subdivisions (municipal securities)471,346  24,542  —  495,888  
Residential mortgage-related securities
FNMA / FHLMC813,458  4,652  —  818,110  
GNMA592,338  13,222  —  605,561  
Commercial mortgage-related securities
FNMA / FHLMC19,793  2,269  —  22,061  
GNMA782,577  20,786  —  803,362  
Asset backed securities
FFELP356,532  —  (16,058) 340,474  
SBA9,619  —  (44) 9,575  
Other debt securities3,000  —  —  3,000  
Total investment securities available for sale$3,100,291  $65,584  $(16,102) $3,149,773  
Investment securities held to maturity
U. S. Treasury securities$999  $36  $—  $1,036  
Obligations of state and political subdivisions (municipal securities)1,435,938  110,132  (53) 1,546,018  
Residential mortgage-related securities
FNMA / FHLMC71,872  3,400  —  75,271  
GNMA207,908  7,012  —  214,920  
GNMA commercial mortgage-related securities360,570  11,691  —  372,261  
Total investment securities held to maturity$2,077,287  $132,271  $(53) $2,209,505  
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ 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) $2,276,465  
Investment securities held to maturity The amortized cost and fair values of securities available for sale and held to maturity at June 30, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
U. S. Treasury securities$26,646  $88  $—  $26,735  
Agency securities24,982  25  —  25,007  
Obligations of state and political subdivisions (municipal securities)471,346  24,542  —  495,888  
Residential mortgage-related securities
FNMA / FHLMC813,458  4,652  —  818,110  
GNMA592,338  13,222  —  605,561  
Commercial mortgage-related securities
FNMA / FHLMC19,793  2,269  —  22,061  
GNMA782,577  20,786  —  803,362  
Asset backed securities
FFELP356,532  —  (16,058) 340,474  
SBA9,619  —  (44) 9,575  
Other debt securities3,000  —  —  3,000  
Total investment securities available for sale$3,100,291  $65,584  $(16,102) $3,149,773  
Investment securities held to maturity
U. S. Treasury securities$999  $36  $—  $1,036  
Obligations of state and political subdivisions (municipal securities)1,435,938  110,132  (53) 1,546,018  
Residential mortgage-related securities
FNMA / FHLMC71,872  3,400  —  75,271  
GNMA207,908  7,012  —  214,920  
GNMA commercial mortgage-related securities360,570  11,691  —  372,261  
Total investment securities held to maturity$2,077,287  $132,271  $(53) $2,209,505  
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ 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) $2,276,465  
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities available for sale and held to maturity at June 30, 2020 are shown below:
 Available for SaleHeld to Maturity
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$9,427  $9,458  $33,745  $33,927  
Due after one year through five years83,136  83,882  67,917  69,887  
Due after five years through ten years343,084  360,051  166,553  175,189  
Due after ten years90,327  97,240  1,168,722  1,268,050  
Total debt securities525,975  550,630  1,436,937  1,547,053  
Residential mortgage-related securities
FNMA / FHLMC813,458  818,110  71,872  75,271  
GNMA592,338  605,561  207,908  214,920  
Commercial mortgage-related securities
FNMA / FHLMC19,793  22,061  —  —  
GNMA782,577  803,362  360,570  372,261  
Asset backed securities
FFELP 356,532  340,474  —  —  
SBA9,619  9,575  —  —  
Total investment securities$3,100,291  $3,149,773  $2,077,287  $2,209,505  
Ratio of fair value to amortized cost101.6 %106.4 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of held to maturity securities at amortized cost at June 30, 2020:
($ in Thousands)AAAAAATotal
U. S. Treasury securities$999  $—  $—  $999  
Obligations of state and political subdivisions (municipal securities)561,670  853,910  20,358  1,435,938  
Residential mortgage-related securities
FNMA/FHLMC71,872  —  —  71,872  
GNMA207,908  —  —  207,908  
GNMA commercial mortgage-related securities360,570  —  —  360,570  
Total held to maturity securities$1,203,018  $853,910  $20,358  $2,077,287  
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three and six months ended June 30, 2020 and 2019 are shown below:
Three Months Ended June 30,Six Months Ended June 30,
($ in Thousands)2020201920202019
Gross gains on available for sale securities$3,106  $654  $9,304  $2,334  
Gross gains on held to maturity securities—  —  —  —  
Total gains3,106  654  9,304  2,334  
Gross (losses) on available for sale securities(11) (13,636) (90) (13,636) 
Gross (losses) on held to maturity securities—  —  —  —  
Total (losses)(11) (13,636) (90) (13,636) 
Write-up of equity securities without readily determinable fair values—  13,444  —  13,444  
Investment securities gains (losses), net$3,096  $463  $9,214  $2,143  
Proceeds from sales of investment securities$261,037  $803,105  $626,276  $934,228  
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at June 30, 2020:
 Less than 12 months12 months or moreTotal
($ 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
Obligations of state and political subdivisions (municipal securities)1  $—  $548  —  $—  $—  $—  $548  
FNMA / FHLMC residential mortgage-related securities5  —  54,893  —  —  —  —  54,893  
Asset backed securities
FFELP9  (5,478) 147,310  17  (10,580) 193,164  (16,058) 340,474  
SBA15  (44) 9,422  —  —  —  (44) 9,422  
Total30  $(5,522) $212,172  17  $(10,580) $193,164  $(16,102) $405,336  
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)8  $(52) $12,431  2  $(1) $365  $(53) $12,796  
Total8  $(52) $12,431  2  $(1) $365  $(53) $12,796  
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019:
 Less than 12 months12 months or moreTotal
($ 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