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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018, and 2017 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Realized gains (losses): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains |  | $ | 9,530 |  | $ | 4,221 |  | $ | 1,170
Gross realized losses | ​ |  | (1,855) | ​ |  | (3,838) | ​ |  | (370)
Net realized gains |  | $ | 7,675 |  | $ | 383 |  | $ | 800
Proceeds from sales of securities |  | $ | 514,070 |  | $ | 515,764 |  | $ | 139,046
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 securities AFS as of December 31, 2019 and 2018 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 | ​ | $ | 4,487 | ​ | $ | 11 | ​ | $ | — | ​ | $ | 4,498
Obligations of states and political subdivisions | ​ |  | 417,397 | ​ |  | 25,624 | ​ |  | (29) | ​ |  | 442,992
Corporate and other bonds (1) | ​ |  | 259,213 | ​ |  | 4,403 | ​ |  | (546) | ​ |  | 263,070
Mortgage-backed securities | ​ |  | 1,209,251 | ​ |  | 23,880 | ​ |  | (1,325) | ​ |  | 1,231,806
Other securities | ​ |  | 3,079 | ​ |  | — | ​ |  | — | ​ |  | 3,079
Total AFS securities | ​ | $ | 1,893,427 | ​ | $ | 53,918 | ​ | $ | (1,900) | ​ | $ | 1,945,445
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Obligations of states and political subdivisions | ​ | $ | 466,588 | ​ | $ | 3,844 | ​ | $ | (1,941) | ​ | $ | 468,491
Corporate and other bonds (1) | ​ |  | 167,561 | ​ |  | 1,118 | ​ |  | (983) | ​ |  | 167,696
Mortgage-backed securities | ​ |  | 1,138,034 | ​ |  | 4,452 | ​ |  | (12,621) | ​ |  | 1,129,865
Other securities | ​ |  | 8,769 | ​ |  | — | ​ |  | — | ​ |  | 8,769
Total AFS securities | ​ | $ | 1,780,952 | ​ | $ | 9,414 | ​ | $ | (15,545) | ​ | $ | 1,774,821
(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 (dollars in thousands) of the Company’s AFS securities with unrealized losses that are not deemed to be other-than-temporarily impaired as of December 31, 2019 and 2018. These are aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | More than 12 months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
​ | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
December 31, 2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of states and political subdivisions | ​ | $ | 4,526 | ​ | $ | (29) | ​ | $ | — | ​ | $ | — | ​ | $ | 4,526 | ​ | $ | (29)
Corporate and other bonds(1) | ​ |  | 44,567 | ​ |  | (255) | ​ |  | 19,902 | ​ |  | (291) | ​ |  | 64,469 | ​ |  | (546)
Mortgage-backed securities | ​ |  | 149,255 | ​ |  | (920) | ​ |  | 55,133 | ​ |  | (405) | ​ |  | 204,388 | ​ |  | (1,325)
Total AFS securities | ​ | $ | 198,348 | ​ | $ | (1,204) | ​ | $ | 75,035 | ​ | $ | (696) | ​ | $ | 273,383 | ​ | $ | (1,900)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Obligations of states and political subdivisions | ​ | $ | 133,513 | ​ | $ | (1,566) | ​ | $ | 10,145 | ​ | $ | (375) | ​ | $ | 143,658 | ​ | $ | (1,941)
Corporate and other bonds(1) | ​ |  | 35,478 | ​ |  | (315) | ​ |  | 33,888 | ​ |  | (668) | ​ |  | 69,366 | ​ |  | (983)
Mortgage-backed securities | ​ |  | 306,038 | ​ |  | (3,480) | ​ |  | 341,400 | ​ |  | (9,141) | ​ |  | 647,438 | ​ |  | (12,621)
Total AFS securities | ​ | $ | 475,029 | ​ | $ | (5,361) | ​ | $ | 385,433 | ​ | $ | (10,184) | ​ | $ | 860,462 | ​ | $ | (15,545)
​
| (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, 2019 and 2018, 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, 2019 | December 31, 2018
​ |  | Amortized |  | Estimated |  | Amortized |  | Estimated
​ | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | 35,046 | ​ | $ | 35,197 | ​ | $ | 22,653 | ​ | $ | 22,789
Due after one year through five years | ​ |  | 164,605 | ​ |  | 166,873 | ​ |  | 191,003 | ​ |  | 188,999
Due after five years through ten years | ​ |  | 249,712 | ​ |  | 254,790 | ​ |  | 218,211 | ​ |  | 217,304
Due after ten years | ​ |  | 1,444,064 | ​ |  | 1,488,585 | ​ |  | 1,349,085 | ​ |  | 1,345,729
Total AFS securities | ​ | $ | 1,893,427 | ​ | $ | 1,945,445 | ​ | $ | 1,780,952 | ​ | $ | 1,774,821
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, 2019 and 2018, 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, 2019 | ​ | December 31, 2018
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
​ | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Due in one year or less | ​ | $ | 502 | ​ | $ | 504 | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ |  | 10,258 | ​ |  | 10,539 | ​ |  | 3,893 | ​ |  | 3,900
Due after five years through ten years | ​ |  | 1,768 | ​ |  | 1,800 | ​ |  | 3,480 | ​ |  | 3,507
Due after ten years | ​ |  | 542,616 | ​ |  | 590,660 | ​ |  | 484,899 | ​ |  | 492,094
Total HTM securities | ​ | $ | 555,144 | ​ | $ | 603,503 | ​ | $ | 492,272 | ​ | $ | 499,501
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 securities held to maturity as of December 31, 2019 and 2018 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) |  | Fair Value
December 31, 2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of states and political subdivisions | ​ | $ | 545,148 | ​ | $ | 48,274 | ​ | $ | — | ​ | $ | 593,422
Mortgage-backed securities | ​ |  | 9,996 | ​ |  | 85 | ​ |  | — | ​ |  | 10,081
Total held-to-maturity securities | ​ | $ | 555,144 | ​ | $ | 48,359 | ​ | $ | — | ​ | $ | 603,503
December 31, 2018 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Obligations of states and political subdivisions | ​ | $ | 492,272 | ​ | $ | 7,375 | ​ | $ | (146) | ​ | $ | 499,501
Gross Unrealized Losses and Fair Value of Securities | The following table shows the gross unrealized losses and fair value (dollars in thousands) of the Company’s held to maturity securities with unrealized losses that are not deemed to be other-than-temporarily impaired as of December 31, 2019 and 2018. These are aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | More than 12 months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
​ | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
December 31, 2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of states and political subdivisions | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of states and political subdivisions | ​ | $ | 43,206 | ​ | $ | (146) | ​ | $ | — | ​ | $ | — | ​ | $ | 43,206 | ​ | $ | (146)

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