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Investment Securities (Tables)
 9 Months Ended
Sep. 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 September 30, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$124,253 $46 $(319)$123,981 
Agency securities15,000 — (2)14,998 
Obligations of state and political subdivisions (municipal securities)394,310 19,709 — 414,020 
Residential mortgage-related securities
FNMA / FHLMC2,377,335 9,216 (9,144)2,377,408 
GNMA77,199 2,497 — 79,696 
Private-label76,033 — — 76,033 
Commercial mortgage-related securities
FNMA / FHLMC357,837 2,230 (6,892)353,175 
GNMA227,622 3,474 — 231,096 
Asset backed securities
FFELP212,378 890 (471)212,797 
SBA7,182 44 (48)7,179 
Other debt securities3,000 — (1)2,999 
Total investment securities AFS$3,872,150 $38,106 $(16,877)$3,893,379 
Investment securities HTM
U. S. Treasury securities$1,000 $7 $— $1,007 
Obligations of state and political subdivisions (municipal securities)1,541,443 106,181 (3,996)1,643,628 
Residential mortgage-related securities
FNMA / FHLMC37,318 2,129 — 39,447 
GNMA54,900 2,328 — 57,228 
Commercial mortgage-related securities
FNMA/FHLMC170,739 248 (4,002)166,985 
GNMA124,383 3,202 (22)127,562 
Total investment securities HTM$1,929,783 $114,095 $(8,019)$2,035,858 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Investment securities held to maturity The amortized cost and fair values of securities AFS and HTM at September 30, 2021 were as follows:
($ in Thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair Value
Investment securities AFS
U. S. Treasury securities$124,253 $46 $(319)$123,981 
Agency securities15,000 — (2)14,998 
Obligations of state and political subdivisions (municipal securities)394,310 19,709 — 414,020 
Residential mortgage-related securities
FNMA / FHLMC2,377,335 9,216 (9,144)2,377,408 
GNMA77,199 2,497 — 79,696 
Private-label76,033 — — 76,033 
Commercial mortgage-related securities
FNMA / FHLMC357,837 2,230 (6,892)353,175 
GNMA227,622 3,474 — 231,096 
Asset backed securities
FFELP212,378 890 (471)212,797 
SBA7,182 44 (48)7,179 
Other debt securities3,000 — (1)2,999 
Total investment securities AFS$3,872,150 $38,106 $(16,877)$3,893,379 
Investment securities HTM
U. S. Treasury securities$1,000 $7 $— $1,007 
Obligations of state and political subdivisions (municipal securities)1,541,443 106,181 (3,996)1,643,628 
Residential mortgage-related securities
FNMA / FHLMC37,318 2,129 — 39,447 
GNMA54,900 2,328 — 57,228 
Commercial mortgage-related securities
FNMA/FHLMC170,739 248 (4,002)166,985 
GNMA124,383 3,202 (22)127,562 
Total investment securities HTM$1,929,783 $114,095 $(8,019)$2,035,858 
The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows:
($ 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 $— $2,028,943 
Amortized cost and fair values of investment securities by contractual maturity The expected maturities of investment securities AFS and HTM at September 30, 2021, are shown below:
 AFSHTM
($ in Thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$7,987 $7,996 $27,797 $27,982 
Due after one year through five years75,545 75,970 39,029 40,265 
Due after five years through ten years415,467 430,634 181,911 189,290 
Due after ten years37,565 41,396 1,293,705 1,387,099 
Total debt securities536,564 555,997 1,542,442 1,644,635 
Residential mortgage-related securities
FNMA / FHLMC2,377,335 2,377,408 37,318 39,447 
GNMA77,199 79,696 54,900 57,228 
Private-label76,033 76,033 — — 
Commercial mortgage-related securities
FNMA / FHLMC357,837 353,175 170,739 166,985 
GNMA227,622 231,096 124,383 127,562 
Asset backed securities
FFELP 212,378 212,797 — — 
SBA7,182 7,179 — — 
Total investment securities$3,872,150 $3,893,379 $1,929,783 $2,035,858 
Ratio of fair value to amortized cost100.5 %105.5 %
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of HTM securities at amortized cost at September 30, 2021:
($ in Thousands)AAAAAANot RatedTotal
U. S. Treasury securities$1,000 $— $— $— $1,000 
Obligations of state and political subdivisions (municipal securities)683,098 847,641 10,511 194 1,541,443 
Residential mortgage-related securities
FNMA / FHLMC37,318 — — — 37,318 
GNMA54,900 — — — 54,900 
Commercial mortgage-related securities
FNMA / FHLMC170,739 — — — 170,739 
GNMA 124,383 — — — 124,383 
Total HTM securities$1,071,438 $847,641 $10,511 $194 $1,929,783 
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020:
($ 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 $1,879,005 
Realized gains and losses and proceeds from sale The proceeds from the sale of investment securities for the three and nine months ended September 30, 2021 and 2020, are shown below:
Three Months Ended Sep 30,Nine Months Ended Sep 30,
($ in Thousands)2021202020212020
Gross gains on AFS securities$— $7 $421 $9,312 
Gross (losses) on AFS securities— — (437)(90)
Investment securities gains (losses), net$— $7 $(16)$9,222 
Proceeds from sales of investment securities$— $8 $158,708 $626,283 
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length
The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2021:
 Less than 12 months12 months or moreTotal
($ 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 securities4 $(319)$84,071 — — $— $(319)$84,071 
Agency securities1 (2)14,998 — — — (2)14,998 
Residential mortgage-related securities
FNMA / FHLMC33 (9,144)1,170,981 — — — (9,144)1,170,981 
GNMA1 — 69 — — — — 69 
FNMA / FHLMC commercial mortgage-related securities19 (6,892)331,504 — — — (6,892)331,504 
Asset backed securities
FFELP1 (124)34,876 8 (347)65,002 (471)99,878 
SBA— — — 9 (48)4,229 (48)4,229 
Other debt securities1 (1)999 — — — (1)999 
Total60 $(16,482)$1,637,498 17 $(395)$69,231 $(16,877)$1,706,729 
Investment securities HTM
Obligations of state and political subdivisions (municipal securities)62 $(3,996)$151,216 — $— $— $(3,996)$151,216 
 Commercial mortgage-related securities
FNMA / FHLMC11 (4,002)146,248 — — — (4,002)146,248 
GNMA1 (22)15,631 — — — (22)15,631 
Total74 $(8,019)$313,096 — $— $— $(8,019)$313,096 
For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020:
 Less than 12 months12 months or moreTotal
($ 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