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SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
Amortized Cost of HTM Securities by Security Type and Credit Rating | The following table presents the amortized cost of HTM securities as of March 31, 2021 and 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
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit Rating: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
AAA/AA/A | ​ | $ | — | ​ | $ | 531,203 | ​ | $ | — | ​ | $ | 531,203
Not Rated - Agency(1) | ​ | ​ | 2,676 | ​ | ​ | — | ​ | ​ | 5,265 | ​ | ​ | 7,941
Not Rated - Non-Agency | ​ | ​ | — | ​ |  | 4,431 | ​ | ​ | — | ​ | ​ | 4,431
Total | ​ | $ | 2,676 | ​ | $ | 535,634 | ​ | $ | 5,265 | ​ | $ | 543,575
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 three months ended March 31, 2021 and 2020 (dollars in thousands).
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Three Months Ended
​ | ​ | March 31, 2021 | ​ | March 31, 2020
Realized gains (losses): |  | ​ |  |  | ​ |
Gross realized gains | ​ | $ | 138 | ​ | $ | 2,164
Gross realized losses | ​ |  | (60) | ​ |  | (228)
Net realized gains | ​ | $ | 78 | ​ | $ | 1,936
​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | $ | 45,436 | ​ | $ | 120,701
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 March 31, 2021 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Estimated
​ |  | Cost |  | Gains |  | (Losses) |  | Fair Value
March 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 11,470 | ​ | $ | 254 | ​ | $ | (47) | ​ | $ | 11,677
Obligations of states and political subdivisions | ​ |  | 868,297 | ​ |  | 35,757 | ​ |  | (4,956) | ​ |  | 899,098
Corporate and other bonds (1) | ​ |  | 145,403 | ​ |  | 2,448 | ​ |  | (243) | ​ |  | 147,608
Commercial mortgage-backed securities | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Agency | ​ | ​ | 316,527 | ​ |  | 11,260 | ​ |  | (1,615) | ​ | ​ | 326,172
Non-agency | ​ | ​ | 58,691 | ​ |  | 79 | ​ |  | (110) | ​ | ​ | 58,660
Total commercial mortgage-backed securities | ​ | ​ | 375,218 | ​ |  | 11,339 | ​ |  | (1,725) | ​ | ​ | 384,832
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 1,138,014 | ​ |  | 26,812 | ​ |  | (13,668) | ​ | ​ | 1,151,158
Non-agency | ​ | ​ | 100,036 | ​ |  | 1,521 | ​ |  | (512) | ​ | ​ | 101,045
Total residential mortgage-backed securities | ​ | ​ | 1,238,050 | ​ |  | 28,333 | ​ |  | (14,180) | ​ | ​ | 1,252,203
Other securities | ​ |  | 1,625 | ​ |  | — | ​ |  | — | ​ |  | 1,625
Total AFS securities | ​ | $ | 2,640,063 | ​ | $ | 78,131 | ​ | $ | (21,151) | ​ | $ | 2,697,043
(1) | Other bonds include asset-backed 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 include 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 March 31, 2021 and December 31, 2020 and that are not deemed to be impaired as of those dates. 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
March 31, 2021 | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
U.S. government and agency securities | ​ | $ | — | ​ | $ | — | ​ | $ | 4,899 | ​ | $ | (47) | ​ | $ | 4,899 | ​ | $ | (47)
Obligations of states and political subdivisions | ​ | ​ | 271,172 | ​ | ​ | (4,956) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 271,172 | ​ | ​ | (4,956)
Corporate and other bonds(1) | ​ |  | 42,612 | ​ |  | (237) | ​ |  | 4,785 | ​ |  | (6) | ​ |  | 47,397 | ​ |  | (243)
Commercial mortgage-backed securities | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Agency | ​ | ​ | 65,708 | ​ | ​ | (1,614) | ​ | ​ | 359 | ​ | ​ | (1) | ​ | ​ | 66,067 | ​ | ​ | (1,615)
Non-agency | ​ | ​ | 26,736 | ​ | ​ | (110) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 26,736 | ​ | ​ | (110)
Total commercial mortgage-backed securities | ​ | ​ | 92,444 | ​ | ​ | (1,724) | ​ | ​ | 359 | ​ | ​ | (1) | ​ | ​ | 92,803 | ​ | ​ | (1,725)
Residential mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 558,523 | ​ | ​ | (13,650) | ​ | ​ | 1,175 | ​ | ​ | (18) | ​ | ​ | 559,698 | ​ | ​ | (13,668)
Non-agency | ​ | ​ | 36,031 | ​ | ​ | (491) | ​ | ​ | 10,070 | ​ | ​ | (21) | ​ | ​ | 46,101 | ​ | ​ | (512)
Total residential mortgage-backed securities | ​ | ​ | 594,554 | ​ | ​ | (14,141) | ​ | ​ | 11,245 | ​ | ​ | (39) | ​ | ​ | 605,799 | ​ | ​ | (14,180)
Total AFS securities | ​ | $ | 1,000,782 | ​ | $ | (21,058) | ​ | $ | 21,288 | ​ | $ | (93) | ​ | $ | 1,022,070 | ​ | $ | (21,151)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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)
(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 March 31, 2021 and December 31, 2020, by contractual maturity. 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 (dollars in thousands).
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ |  | Amortized |  | Estimated |  | Amortized |  | Estimated
​ | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | 18,007 | ​ | $ | 18,168 | ​ | $ | 19,875 | ​ | $ | 19,997
Due after one year through five years | ​ |  | 166,575 | ​ |  | 172,723 | ​ |  | 161,448 | ​ |  | 169,103
Due after five years through ten years | ​ |  | 233,566 | ​ |  | 239,838 | ​ |  | 235,021 | ​ |  | 242,791
Due after ten years | ​ |  | 2,221,915 | ​ |  | 2,266,314 | ​ |  | 2,022,903 | ​ |  | 2,108,528
Total AFS securities | ​ | $ | 2,640,063 | ​ | $ | 2,697,043 | ​ | $ | 2,439,247 | ​ | $ | 2,540,419
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 March 31, 2021 and December 31, 2020, by contractual maturity. 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 (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
​ | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Due in one year or less | ​ | $ | 1,441 | ​ | $ | 1,449 | ​ | $ | 1,443 | ​ | $ | 1,460
Due after one year through five years | ​ |  | 8,518 | ​ |  | 8,786 | ​ |  | 8,577 | ​ |  | 8,893
Due after five years through ten years | ​ |  | 1,680 | ​ |  | 1,719 | ​ |  | 1,744 | ​ |  | 1,805
Due after ten years | ​ |  | 531,936 | ​ |  | 594,405 | ​ |  | 533,087 | ​ |  | 607,607
Total HTM securities | ​ | $ | 543,575 | ​ | $ | 606,359 | ​ | $ | 544,851 | ​ | $ | 619,765
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 March 31, 2021 are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Gross Unrealized | ​ | Estimated
​ |  | Value |  | Gains |  | (Losses) | ​ | Fair Value
March 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government and agency securities | ​ | $ | 2,676 | ​ | $ | — | ​ | $ | (31) | ​ | $ | 2,645
Obligations of states and political subdivisions | ​ | ​ | 535,634 | ​ | ​ | 62,880 | ​ | ​ | — | ​ | ​ | 598,514
Commercial mortgage-backed securities | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency | ​ | ​ | 5,265 | ​ | ​ | 1 | ​ | ​ | (66) | ​ | ​ | 5,200
Non-agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total commercial mortgage-backed securities | ​ | ​ | 5,265 | ​ | ​ | 1 | ​ | ​ | (66) | ​ | ​ | 5,200
Total held-to-maturity securities | ​ | $ | 543,575 | ​ | $ | 62,881 | ​ | $ | (97) | ​ | $ | 606,359
​ 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

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