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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investment securities available for sale The amortized cost and fair values of securities AFS and HTM at June 30, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$124,216 $498 $(181)$124,533 
Agency securities15,000 — (9)14,991 
Obligations of state and political subdivisions (municipal securities)398,617 21,992 — 420,609 
Residential mortgage-related securities
FNMA / FHLMC2,049,513 11,681 (3,285)2,057,909 
GNMA90,956 3,011 — 93,967 
Commercial mortgage-related securities
FNMA / FHLMC93,693 2,647 (632)95,708 
GNMA284,815 4,777 — 289,593 
Asset backed securities
FFELP214,904 914 (354)215,464 
SBA7,575 46 (48)7,573 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,282,290 $45,566 $(4,509)$3,323,346 
Investment securities HTM
U. S. Treasury securities$1,000 $13 $— $1,013 
Obligations of state and political subdivisions (municipal securities)1,479,375 121,908 (190)1,601,093 
Residential mortgage-related securities
FNMA / FHLMC41,505 2,151 — 43,656 
GNMA66,979 2,618 — 69,597 
Commercial mortgage-related securities
FNMA/FHLMC63,668 515 (591)63,591 
GNMA147,366 4,225 — 151,591 
Total investment securities HTM$1,799,893 $131,430 $(781)$1,930,541 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Investment securities held to maturity The amortized cost and fair values of securities AFS and HTM at June 30, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$124,216 $498 $(181)$124,533 
Agency securities15,000 — (9)14,991 
Obligations of state and political subdivisions (municipal securities)398,617 21,992 — 420,609 
Residential mortgage-related securities
FNMA / FHLMC2,049,513 11,681 (3,285)2,057,909 
GNMA90,956 3,011 — 93,967 
Commercial mortgage-related securities
FNMA / FHLMC93,693 2,647 (632)95,708 
GNMA284,815 4,777 — 289,593 
Asset backed securities
FFELP214,904 914 (354)215,464 
SBA7,575 46 (48)7,573 
Other debt securities3,000 — — 3,000 
Total investment securities AFS$3,282,290 $45,566 $(4,509)$3,323,346 
Investment securities HTM
U. S. Treasury securities$1,000 $13 $— $1,013 
Obligations of state and political subdivisions (municipal securities)1,479,375 121,908 (190)1,601,093 
Residential mortgage-related securities
FNMA / FHLMC41,505 2,151 — 43,656 
GNMA66,979 2,618 — 69,597 
Commercial mortgage-related securities
FNMA/FHLMC63,668 515 (591)63,591 
GNMA147,366 4,225 — 151,591 
Total investment securities HTM$1,799,893 $131,430 $(781)$1,930,541 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities AFS and HTM at June 30, 2021, are shown below:
 AFSHTM
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$6,278 $6,285 $29,227 $29,460 
Due after one year through five years77,593 78,211 42,396 43,855 
Due after five years through ten years419,367 436,807 175,687 184,271 
Due after ten years37,595 41,829 1,233,065 1,344,520 
Total debt securities540,833 563,132 1,480,375 1,602,106 
Residential mortgage-related securities
FNMA / FHLMC2,049,513 2,057,909 41,505 43,656 
GNMA90,956 93,967 66,979 69,597 
Commercial mortgage-related securities
FNMA / FHLMC93,693 95,708 63,668 63,591 
GNMA284,815 289,593 147,366 151,591 
Asset backed securities
FFELP 214,904 215,464 — — 
SBA7,575 7,573 — — 
Total investment securities$3,282,290 $3,323,346 $1,799,893 $1,930,541 
Ratio of fair value to amortized cost101.3 %107.3 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of HTM securities at amortized cost at June 30, 2021:
($ in Thousands)AAAAAANot RatedTotal
U. S. Treasury securities$1,000 $— $— $— $1,000 
Obligations of state and political subdivisions (municipal securities)600,671 867,638 10,872 194 1,479,375 
Residential mortgage-related securities
FNMA / FHLMC41,505 — — — 41,505 
GNMA66,979 — — — 66,979 
Commercial mortgage-related securities
FNMA / FHLMC63,668 — — — 63,668 
GNMA 147,366 — — — 147,366 
Total HTM securities$921,188 $867,638 $10,872 $194 $1,799,893 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020:
($ 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 
GNMA 255,742 — — 255,742 
Total HTM securities$1,004,357 $860,607 $14,041 $1,879,005 
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three and six months ended June 30, 2021 and 2020, are shown below:
Three Months Ended June 30,Six Months Ended June 30,
($ in Thousands)2021202020212020
Gross gains on AFS securities$386 $3,106 $421 $9,304 
Gross (losses) on AFS securities(362)(11)(437)(90)
Investment securities gains (losses), net$24 $3,096 $(16)$9,214 
Proceeds from sales of investment securities$107,412 $261,037 $158,708 $626,276 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at June 30, 2021:
 Less than 12 months12 months or moreTotal
($ 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 securities2 $(181)$9,743 — — $— $(181)$9,743 
Agency securities1 (9)14,991 — — — (9)14,991 
FNMA / FHLMC residential mortgage-related securities17 (3,285)604,030 — — — (3,285)604,030 
Commercial mortgage-related securities
FNMA / FHLMC1 (632)39,472 — — — (632)39,472 
GNMA2 — 34 — — — — 34 
Asset backed securities
FFELP2 (36)23,835 9 (318)72,947 (354)96,782 
SBA— — — 9 (48)4,642 (48)4,642 
Total25 $(4,143)$692,103 18 $(366)$77,589 $(4,509)$769,692 
Investment securities HTM
Obligations of state and political subdivisions (municipal securities)11 $(190)$18,891 — $— $— $(190)$18,891 
FNMA / FHLMC commercial mortgage-related securities6 (591)42,530 — — — (591)42,530 
Total17 $(781)$61,422 — $— $— $(781)$61,422 
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020:
 Less than 12 months12 months or moreTotal
($ 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