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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investment securities available for sale The amortized cost and fair values of securities AFS and HTM at March 31, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$54,237 $— $(544)$53,693 
Agency securities15,000 — (96)14,904 
Obligations of state and political subdivisions (municipal securities)411,964 21,218 — 433,182 
Residential mortgage-related securities
FNMA / FHLMC1,910,644 5,956 (5,647)1,910,954 
GNMA119,913 3,451 — 123,365 
Commercial mortgage-related securities
FNMA / FHLMC93,902 2,330 (1,883)94,349 
GNMA381,158 8,254 — 389,411 
Asset backed securities
FFELP325,812 1,675 (1,554)325,933 
SBA8,216 — (57)8,160 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,323,846 $42,885 $(9,782)$3,356,949 
Investment securities HTM
U. S. Treasury securities$1,000 $20 $— $1,019 
Obligations of state and political subdivisions (municipal securities)1,455,462 106,933 (994)1,561,401 
Residential mortgage-related securities
FNMA / FHLMC47,480 2,471 — 49,951 
GNMA87,717 3,353 — 91,070 
Commercial mortgage-related securities
FNMA/FHLMC63,844 157 (2,138)61,863 
GNMA201,648 5,611 (21)207,238 
Total investment securities HTM$1,857,150 $118,544 $(3,154)$1,972,541 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Investment securities held to maturity The amortized cost and fair values of securities AFS and HTM at March 31, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$54,237 $— $(544)$53,693 
Agency securities15,000 — (96)14,904 
Obligations of state and political subdivisions (municipal securities)411,964 21,218 — 433,182 
Residential mortgage-related securities
FNMA / FHLMC1,910,644 5,956 (5,647)1,910,954 
GNMA119,913 3,451 — 123,365 
Commercial mortgage-related securities
FNMA / FHLMC93,902 2,330 (1,883)94,349 
GNMA381,158 8,254 — 389,411 
Asset backed securities
FFELP325,812 1,675 (1,554)325,933 
SBA8,216 — (57)8,160 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,323,846 $42,885 $(9,782)$3,356,949 
Investment securities HTM
U. S. Treasury securities$1,000 $20 $— $1,019 
Obligations of state and political subdivisions (municipal securities)1,455,462 106,933 (994)1,561,401 
Residential mortgage-related securities
FNMA / FHLMC47,480 2,471 — 49,951 
GNMA87,717 3,353 — 91,070 
Commercial mortgage-related securities
FNMA/FHLMC63,844 157 (2,138)61,863 
GNMA201,648 5,611 (21)207,238 
Total investment securities HTM$1,857,150 $118,544 $(3,154)$1,972,541 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities AFS and HTM at March 31, 2021, are shown below:
 AFSHTM
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$9,575 $9,588 $35,299 $35,587 
Due after one year through five years79,504 79,813 47,810 49,383 
Due after five years through ten years357,498 373,906 179,382 188,263 
Due after ten years37,624 41,472 1,193,970 1,289,186 
Total debt securities484,201 504,778 1,456,461 1,562,420 
Residential mortgage-related securities
FNMA / FHLMC1,910,644 1,910,954 47,480 49,951 
GNMA119,913 123,365 87,717 91,070 
Commercial mortgage-related securities
FNMA / FHLMC93,902 94,349 63,844 61,863 
GNMA381,158 389,411 201,648 207,238 
Asset backed securities
FFELP 325,812 325,933 — — 
SBA8,216 8,160 — — 
Total investment securities$3,323,846 $3,356,949 $1,857,150 $1,972,541 
Ratio of fair value to amortized cost101.0 %106.2 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of HTM securities at amortized cost at March 31, 2021:
($ in Thousands)AAAAAANot RatedTotal
U. S. Treasury securities$1,000 $— $— $— $1,000 
Obligations of state and political subdivisions (municipal securities)582,675 860,882 11,711 193 1,455,462 
Residential mortgage-related securities
FNMA / FHLMC47,480 — — — 47,480 
GNMA87,717 — — — 87,717 
Commercial mortgage-related securities
FNMA / FHLMC63,844 — — — 63,844 
GNMA 201,648 — — — 201,648 
Total HTM securities$984,363 $860,882 $11,711 $193 $1,857,150 
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three months ended March 31, 2021 and 2020, are shown below:
Three Months Ended March 31,
($ in Thousands)20212020
Gross gains on AFS securities$36 $6,198 
Gross (losses) on AFS securities(75)(80)
Investment securities gains (losses), net$(39)$6,118 
Proceeds from sales of investment securities$51,295 $365,239 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2021:
 Less than 12 months12 months or moreTotal
($ 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 securities5 $(544)$53,693 — $— $— $(544)$53,693 
Agency securities1 (96)14,904 — — — (96)14,904 
Obligations of state and political subdivisions (municipal securities)1 — 910 — — — — 910 
Residential mortgage-related securities
FNMA / FHLMC 24 (5,647)756,359 — — — (5,647)756,359 
GNMA1 — 253 — — — — 253 
Commercial mortgage-related securities
FNMA / FHLMC2 (1,883)72,435 — — — (1,883)72,435 
GNMA1 — 78 — — — — 78 
Asset backed securities
FFELP— — — 15 (1,554)141,652 (1,554)141,652 
SBA— — — 14 (57)7,750 (57)7,750 
Total35 $(8,171)$898,632 29 $(1,611)$149,402 $(9,782)$1,048,033 
Investment securities HTM
Obligations of state and political subdivisions (municipal securities)33 $(994)$62,908 — $— $— $(994)$62,908 
 Commercial mortgage-related securities
FNMA / FHLMC6 (2,138)41,105 — — — (2,138)41,105 
GNMA2 (21)22,205 — — — (21)22,205 
Total41 $(3,154)$126,218 — $— $— $(3,154)$126,218 
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020:
 Less than 12 months12 months or moreTotal
($ 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