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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Amortized Cost of HTM Securities by Security Type and Credit Rating | The following table presents the amortized cost of HTM securities as of December 31, 2020 by security type and credit rating (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | U.S. Government and Agency |  | Obligations of states and political |  | Mortgage-backed |  | Total HTM
​ | ​ | securities | ​ | subdivisions | ​ | securities | ​ | securities
Credit Rating: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
AAA/AA/A | ​ | $ | — | ​ | $ | 532,157 | ​ | $ | — | ​ | $ | 532,157
Not Rated - Agency(1) | ​ | ​ | 2,751 | ​ | ​ | — | ​ | ​ | 5,333 | ​ | ​ | 8,084
Not Rated - Non-Agency | ​ | ​ | — | ​ |  | 4,610 | ​ | ​ | — | ​ | ​ | 4,610
Total | ​ | $ | 2,751 | ​ | $ | 536,767 | ​ | $ | 5,333 | ​ | $ | 544,851
(1) Generally considered not to have credit risk given the government guarantees associated with these agencies
Gross Realized Gain and Losses on the Sale of Securities | The following table presents the gross realized gains and losses on and the proceeds from the sale of securities during the years ended December 31, 2020, 2019, and 2018 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Realized gains (losses): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains |  | $ | 12,522 |  | $ | 9,530 |  | $ | 4,221
Gross realized losses | ​ |  | (228) | ​ |  | (1,855) | ​ |  | (3,838)
Net realized gains |  | $ | 12,294 |  | $ | 7,675 |  | $ | 383
Proceeds from sales of securities |  | $ | 257,945 |  | $ | 514,070 |  | $ | 515,764
Available-for-sale Securities |
Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities | The amortized cost, gross unrealized gains and losses, and estimated fair values of AFS securities as of December 31, 2020 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | (Losses) |  | Fair Value
December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 13,009 | ​ | $ | 437 | ​ | $ | (52) | ​ | $ | 13,394
Obligations of states and political subdivisions | ​ |  | 786,466 | ​ |  | 50,878 | ​ |  | (18) | ​ |  | 837,326
Corporate and other bonds (1) | ​ |  | 148,747 | ​ |  | 2,430 | ​ |  | (99) | ​ |  | 151,078
Commercial mortgage-backed securities | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Agency | ​ | ​ | 321,015 | ​ |  | 16,277 | ​ |  | (2) | ​ | ​ | 337,290
Non-agency | ​ | ​ | 51,244 | ​ |  | 167 | ​ |  | (17) | ​ | ​ | 51,394
Total commercial mortgage-backed securities | ​ | ​ | 372,259 | ​ |  | 16,444 | ​ |  | (19) | ​ | ​ | 388,684
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,012,237 | ​ |  | 31,816 | ​ |  | (1,946) | ​ | ​ | 1,042,107
Non-agency | ​ | ​ | 104,904 | ​ |  | 1,507 | ​ |  | (206) | ​ | ​ | 106,205
Total residential mortgage-backed securities | ​ | ​ | 1,117,141 | ​ |  | 33,323 | ​ |  | (2,152) | ​ | ​ | 1,148,312
Other securities | ​ |  | 1,625 | ​ |  | — | ​ |  | — | ​ |  | 1,625
Total AFS securities | ​ | $ | 2,439,247 | ​ | $ | 103,512 | ​ | $ | (2,340) | ​ | $ | 2,540,419
(1) | Other bonds includes asset-backed securities.
​ The amortized cost, gross unrealized gains and losses, and estimated fair values of AFS securities as of December 31, 2019 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | (Losses) |  | Fair Value
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government and agency securities | ​ | $ | 21,149 | ​ | $ | 209 | ​ | $ | (38) | ​ | $ | 21,320
Obligations of states and political subdivisions | ​ | ​ | 421,344 | ​ | ​ | 25,776 | ​ | ​ | (29) | ​ | ​ | 447,091
Corporate and other bonds (1) | ​ |  | 134,342 | ​ |  | 1,991 | ​ |  | (374) | ​ |  | 135,959
Commercial mortgage-backed securities | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Agency | ​ | ​ | 405,731 | ​ | ​ | 8,786 | ​ | ​ | (619) | ​ | ​ | 413,898
Non-agency | ​ | ​ | 11,173 | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | 11,149
Total commercial mortgage-backed securities | ​ | ​ | 416,904 | ​ | ​ | 8,786 | ​ | ​ | (643) | ​ | ​ | 425,047
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 852,300 | ​ | ​ | 16,680 | ​ | ​ | (816) | ​ | ​ | 868,164
Non-agency | ​ | ​ | 44,309 | ​ | ​ | 476 | ​ | ​ | — | ​ | ​ | 44,785
Total residential mortgage-backed securities | ​ | ​ | 896,609 | ​ | ​ | 17,156 | ​ | ​ | (816) | ​ | ​ | 912,949
Other securities | ​ |  | 3,079 | ​ |  | — | ​ |  | — | ​ |  | 3,079
Total AFS securities | ​ | $ | 1,893,427 | ​ | $ | 53,918 | ​ | $ | (1,900) | ​ | $ | 1,945,445
(1) | Other bonds includes asset-backed securities.
Schedule of Gross Unrealized Losses and Fair Value of Investments | The following table shows the gross unrealized losses and fair value of the Company’s AFS securities with unrealized losses for which an ACL has not been recorded at December 31, 2020 and that are not deemed to be OTTI as of December 31, 2019. These are aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | More than 12 months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
​ | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government and agency securities | ​ | $ | — | ​ | $ | — | ​ | $ | 5,456 | ​ | $ | (52) | ​ | $ | 5,456 | ​ | ​ | (52)
Obligations of states and political subdivisions | ​ | ​ | 5,091 | ​ | ​ | (18) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,091 | ​ | $ | (18)
Corporate and other bonds(1) | ​ |  | 17,946 | ​ |  | (52) | ​ |  | 10,698 | ​ |  | (47) | ​ |  | 28,644 | ​ |  | (99)
Commercial mortgage-backed securities | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 5,893 | ​ | ​ | (2) | ​ | ​ | 376 | ​ | ​ | — | ​ | ​ | 6,269 | ​ | ​ | (2)
Non-agency | ​ | ​ | 17,654 | ​ | ​ | (17) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 17,654 | ​ | ​ | (17)
Total commercial mortgage-backed securities | ​ | ​ | 23,547 | ​ | ​ | (19) | ​ | ​ | 376 | ​ | ​ | — | ​ | ​ | 23,923 | ​ | ​ | (19)
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 219,388 | ​ | ​ | (1,944) | ​ | ​ | 1,055 | ​ | ​ | (2) | ​ | ​ | 220,443 | ​ | ​ | (1,946)
Non-agency | ​ | ​ | 36,942 | ​ | ​ | (206) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 36,942 | ​ | ​ | (206)
Total residential mortgage-backed securities | ​ | ​ | 256,330 | ​ | ​ | (2,150) | ​ | ​ | 1,055 | ​ | ​ | (2) | ​ | ​ | 257,385 | ​ | ​ | (2,152)
Total AFS securities | ​ | $ | 302,914 | ​ | $ | (2,239) | ​ | $ | 17,585 | ​ | $ | (101) | ​ | $ | 320,499 | ​ | $ | (2,340)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government and agency securities | ​ | $ | 7,638 | ​ | $ | (38) | ​ | $ | — | ​ | $ | — | ​ | $ | 7,638 | ​ | $ | (38)
Obligations of states and political subdivisions | ​ | ​ | 4,526 | ​ | ​ | (29) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,526 | ​ | ​ | (29)
Corporate and other bonds(1) | ​ |  | 17,323 | ​ |  | (83) | ​ |  | 19,901 | ​ |  | (291) | ​ |  | 37,224 | ​ |  | (374)
Commercial mortgage-backed securities | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​
Agency | ​ | ​ | 43,552 | ​ | ​ | (530) | ​ | ​ | 14,966 | ​ | ​ | (89) | ​ | ​ | 58,518 | ​ | ​ | (619)
Non-agency | ​ | ​ | 11,162 | ​ | ​ | (24) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,162 | ​ | ​ | (24)
Total commercial mortgage-backed securities | ​ | ​ | 54,714 | ​ | ​ | (554) | ​ | ​ | 14,966 | ​ | ​ | (89) | ​ | ​ | 69,680 | ​ | ​ | (643)
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 114,147 | ​ | ​ | (500) | ​ | ​ | 40,168 | ​ | ​ | (316) | ​ | ​ | 154,315 | ​ | ​ | (816)
Non-agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total residential mortgage-backed securities | ​ | ​ | 114,147 | ​ | ​ | (500) | ​ | ​ | 40,168 | ​ | ​ | (316) | ​ | ​ | 154,315 | ​ | ​ | (816)
Total AFS securities | ​ | $ | 198,348 | ​ | $ | (1,204) | ​ | $ | 75,035 | ​ | $ | (696) | ​ | $ | 273,383 | ​ | $ | (1,900)
​ (1) Other bonds includes asset-backed securities
Schedule of Amortized Cost and Estimated Fair Value of Securities | The following table presents the amortized cost and estimated fair value of AFS securities as of December 31, 2020 and 2019, by contractual maturity (dollars in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | Amortized |  | Estimated |  | Amortized |  | Estimated
​ | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | 19,875 | ​ | $ | 19,997 | ​ | $ | 35,177 | ​ | $ | 35,329
Due after one year through five years | ​ |  | 161,448 | ​ |  | 169,103 | ​ |  | 164,605 | ​ |  | 166,873
Due after five years through ten years | ​ |  | 235,021 | ​ |  | 242,791 | ​ |  | 249,713 | ​ |  | 254,790
Due after ten years | ​ |  | 2,022,903 | ​ |  | 2,108,528 | ​ |  | 1,443,932 | ​ |  | 1,488,453
Total AFS securities | ​ | $ | 2,439,247 | ​ | $ | 2,540,419 | ​ | $ | 1,893,427 | ​ | $ | 1,945,445
Held-to-maturity Securities |
Schedule of Amortized Cost and Estimated Fair Value of Securities | The following table presents the amortized cost and estimated fair value of HTM securities as of December 31, 2020 and 2019, by contractual maturity (dollars in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
​ | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Due in one year or less | ​ | $ | 1,443 | ​ | $ | 1,460 | ​ | $ | 502 | ​ | $ | 504
Due after one year through five years | ​ |  | 8,577 | ​ |  | 8,893 | ​ |  | 10,258 | ​ |  | 10,539
Due after five years through ten years | ​ |  | 1,744 | ​ |  | 1,805 | ​ |  | 1,768 | ​ |  | 1,800
Due after ten years | ​ |  | 533,087 | ​ |  | 607,607 | ​ |  | 542,616 | ​ |  | 590,660
Total HTM securities | ​ | $ | 544,851 | ​ | $ | 619,765 | ​ | $ | 555,144 | ​ | $ | 603,503
Schedule of Carrying Values, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities | The carrying value, gross unrealized gains and losses, and estimated fair values of HTM securities as of December 31, 2020 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) | ​ | Fair Value
December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 2,751 | ​ | $ | — | ​ | $ | (18) | ​ | $ | 2,733
Obligations of states and political subdivisions | ​ | ​ | 536,767 | ​ | ​ | 74,978 | ​ | ​ | — | ​ | ​ | 611,745
Commercial mortgage-backed securities | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 5,333 | ​ | ​ | 4 | ​ | ​ | (50) | ​ | ​ | 5,287
Non-agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total commercial mortgage-backed securities | ​ | ​ | 5,333 | ​ | ​ | 4 | ​ | ​ | (50) | ​ | ​ | 5,287
Total held-to-maturity securities | ​ | $ | 544,851 | ​ | $ | 74,982 | ​ | $ | (68) | ​ | $ | 619,765
​ ​ The carrying value, gross unrealized gains and losses, and estimated fair values of HTM securities as of December 31, 2019 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) |  | Fair Value
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government and agency securities | ​ | $ | 2,813 | ​ | $ | 26 | ​ | $ | — | ​ | $ | 2,839
Obligations of states and political subdivisions | ​ | ​ | 545,148 | ​ | ​ | 48,274 | ​ | ​ | — | ​ | ​ | 593,422
Commercial mortgage-backed securities | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Agency | ​ | ​ | 7,183 | ​ | ​ | 59 | ​ | ​ | — | ​ | ​ | 7,242
Non-agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total commercial mortgage-backed securities | ​ | ​ | 7,183 | ​ | ​ | 59 | ​ | ​ | — | ​ | ​ | 7,242
Total held-to-maturity securities | ​ | $ | 555,144 | ​ | $ | 48,359 | ​ | $ | — | ​ | $ | 603,503

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