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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
U.S. government SBA agency securities$10,241  $2  $(5) $10,238  
Obligations of state and political subdivisions (municipal securities)492,195  16,443  (1) 508,636  
Residential mortgage-related securities
FNMA / FHLMC103,576  908  —  104,485  
GNMA799,983  23,804  —  823,787  
Commercial mortgage-related securities
FNMA / FHLMC19,861  2,912  —  22,773  
GNMA1,108,336  10,162  (4,055) 1,114,443  
FFELP asset backed securities360,658  —  (19,234) 341,424  
Other debt securities3,000  —  —  3,000  
Total investment securities available for sale$2,897,851  $54,231  $(23,295) $2,928,787  
Investment securities held to maturity
U. S. Treasury securities$999  $42  $—  $1,041  
Obligations of state and political subdivisions (municipal securities)1,426,543  82,382  (475) 1,508,451  
Residential mortgage-related securities
FNMA / FHLMC78,125  3,486  —  81,610  
GNMA245,675  8,124  —  253,799  
GNMA commercial mortgage-related securities398,092  6,500  (1,939) 402,653  
Total investment securities held to maturity$2,149,434  $100,534  $(2,414) $2,247,553  
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ 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) $2,276,465  
Investment securities held to maturity The amortized cost and fair values of securities available for sale and held to maturity at March 31, 2020 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities available for sale
U.S. government SBA agency securities$10,241  $2  $(5) $10,238  
Obligations of state and political subdivisions (municipal securities)492,195  16,443  (1) 508,636  
Residential mortgage-related securities
FNMA / FHLMC103,576  908  —  104,485  
GNMA799,983  23,804  —  823,787  
Commercial mortgage-related securities
FNMA / FHLMC19,861  2,912  —  22,773  
GNMA1,108,336  10,162  (4,055) 1,114,443  
FFELP asset backed securities360,658  —  (19,234) 341,424  
Other debt securities3,000  —  —  3,000  
Total investment securities available for sale$2,897,851  $54,231  $(23,295) $2,928,787  
Investment securities held to maturity
U. S. Treasury securities$999  $42  $—  $1,041  
Obligations of state and political subdivisions (municipal securities)1,426,543  82,382  (475) 1,508,451  
Residential mortgage-related securities
FNMA / FHLMC78,125  3,486  —  81,610  
GNMA245,675  8,124  —  253,799  
GNMA commercial mortgage-related securities398,092  6,500  (1,939) 402,653  
Total investment securities held to maturity$2,149,434  $100,534  $(2,414) $2,247,553  
The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows:
($ 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) $2,276,465  
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities available for sale and held to maturity at March 31, 2020 are shown below:
 Available for SaleHeld to Maturity
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$10,731  $10,738  $32,555  $32,703  
Due after one year through five years30,829  31,242  77,586  78,683  
Due after five years through ten years324,501  334,499  153,519  158,843  
Due after ten years129,134  135,157  1,163,883  1,239,262  
Total debt securities495,195  511,636  1,427,542  1,509,492  
U.S. government SBA agency securities10,241  10,238  —  —  
Residential mortgage-related securities
FNMA / FHLMC103,576  104,485  78,125  81,610  
GNMA799,983  823,787  245,675  253,799  
Commercial mortgage-related securities
FNMA / FHLMC19,861  22,773  —  —  
GNMA1,108,336  1,114,443  398,092  402,653  
FFELP asset backed securities360,658  341,424  —  —  
Total investment securities$2,897,851  $2,928,787  $2,149,434  $2,247,553  
Ratio of fair value to amortized cost101.1 %104.6 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicator of held to maturity securities at amortized cost at March 31, 2020:
($ in Thousands)AAAAAATotal
U. S. Treasury securities$999  $—  $—  $999  
Obligations of state and political subdivisions (municipal securities)543,620  862,040  20,883  1,426,543  
Residential mortgage-related securities
FNMA/FHLMC78,125  —  —  78,125  
GNMA245,675  —  —  245,675  
GNMA commercial mortgage-related securities398,092  —  —  398,092  
Total held to maturity securities$1,266,510  $862,040  $20,883  $2,149,434  
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three months ended March 31, 2020 and 2019 are shown below:
Three Months Ended March 31,
($ in Thousands)20202019
Gross gains on available for sale securities$6,198  $1,680  
Gross gains on held to maturity securities—  —  
Total gains6,198  1,680  
Gross (losses) on available for sale securities(80) —  
Gross (losses) on held to maturity securities—  —  
Total (losses)(80) —  
Investment securities gains (losses), net$6,118  $1,680  
Proceeds from sales of investment securities$365,239  $131,122  
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2020:
 Less than 12 months12 months or moreTotal
($ in Thousands)Number
of
Securities		Unrealized
(Losses)		Fair
Value		Number
of
Securities		Unrealized
(Losses)		Fair
Value		Unrealized
(Losses)		Fair
Value
Investment securities available for sale
U.S. government SBA agency securities7  $(5) $4,958  —  $—  $—  $(5) $4,958  
Obligations of state and political subdivisions (municipal securities)5  (1) 1,313  —  —  —  (1) 1,313  
GNMA commercial mortgage-related securities22  (1,111) 259,273  8  (2,944) 138,611  (4,055) 397,883  
FFELP asset backed securities16  (10,971) 222,197  10  (8,262) 119,228  (19,234) 341,424  
Other debt securities2  —  2,000  —  —  —  —  2,000  
Total52  $(12,089) $489,740  18  $(11,206) $257,838  $(23,295) $747,578  
Investment securities held to maturity
Obligations of state and political subdivisions (municipal securities)22  $(470) $28,779  3  $(5) $542  $(475) $29,321  
Residential mortgage-related securities
FNMA / FHLMC1  —  —  —  —  —  —  —  
GNMA commercial mortgage-related securities8  (332) 126,170  7  (1,607) 126,624  (1,939) 252,794  
Total31  $(802) $154,950  10  $(1,612) $127,166  $(2,414) $282,116  
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019:
 Less than 12 months12 months or moreTotal
($ 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