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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investment Securities |
Schedule of amortized cost of investment securities to estimated fair values | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | 5,926 | ​ | $ | — | ​ | $ | (19) | ​ | $ | 5,907
Obligations of state and political agencies | ​ |  | 148,491 | ​ |  | 5,282 | ​ |  | — | ​ |  | 153,773
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  |
Residential agency | ​ |  | 254,002 | ​ |  | 8,002 | ​ |  | — | ​ |  | 262,004
Commercial | ​ |  | 139,059 | ​ |  | 1,070 | ​ |  | (436) | ​ |  | 139,693
Asset backed securities | ​ |  | 109 | ​ |  | 6 | ​ |  | — | ​ |  | 115
Corporate bonds | ​ |  | 30,553 | ​ |  | 387 | ​ |  | (90) | ​ |  | 30,850
Total available-for-sale investment securities | ​ | $ | 578,140 | ​ | $ | 14,747 | ​ | $ | (545) | ​ | $ | 592,342
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | 21,246 | ​ | $ | 9 | ​ | $ | (15) | ​ | $ | 21,240
Obligations of state and political agencies | ​ |  | 68,162 | ​ |  | 647 | ​ |  | (161) | ​ |  | 68,648
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  |
Residential agency | ​ |  | 180,411 | ​ |  | 2,258 | ​ |  | (131) | ​ |  | 182,538
Commercial | ​ |  | 30,752 | ​ |  | 101 | ​ |  | (168) | ​ |  | 30,685
Asset backed securities | ​ |  | 139 | ​ |  | 5 | ​ |  | — | ​ |  | 144
Corporate bonds | ​ |  | 7,054 | ​ |  | 41 | ​ |  | — | ​ |  | 7,095
Total available-for-sale investment securities | ​ | $ | 307,764 | ​ | $ | 3,061 | ​ | $ | (475) | ​ | $ | 310,350
​
Schedule of contractual maturity of amortized cost and estimated fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Due within one year or less | ​ | $ | 3,469 | ​ | $ | 3,486
Due after one year through five years | ​ |  | 31,607 | ​ |  | 32,256
Due after five years through ten years | ​ |  | 155,141 | ​ |  | 160,462
Due after 10 years | ​ |  | 387,923 | ​ |  | 396,138
Total available-for-sale investment securities | ​ | $ | 578,140 | ​ | $ | 592,342
Schedule of proceeds from the sale of available for sale securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
(dollars in thousands) |  | 2020 |  | 2019 |  | 2018
Proceeds | ​ | $ | 75,647 | ​ | $ | 32,565 | ​ | $ | 6,488
Realized gains | ​ |  | 2,737 | ​ |  | 357 | ​ | ​ | 144
Realized losses | ​ |  | — | ​ |  | (22) | ​ | ​ | (15)
Schedule of investment securities with gross unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | (10) | ​ | $ | 4,509 | ​ | $ | (9) | ​ | $ | 1,309 | ​ | $ | (19) | ​ | $ | 5,818
Obligations of state and political agencies | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Commercial | ​ |  | (432) | ​ |  | 68,494 | ​ |  | (4) | ​ |  | 2,356 | ​ |  | (436) | ​ |  | 70,850
Asset backed securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | (90) | ​ |  | 16,454 | ​ |  | — | ​ |  | — | ​ |  | (90) | ​ |  | 16,454
Total available-for-sale investment securities | ​ | $ | (532) | ​ | $ | 89,457 | ​ | $ | (13) | ​ | $ | 3,667 | ​ | $ | (545) | ​ | $ | 93,124
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
U.S. Treasury and agencies | ​ | $ | (5) | ​ | $ | 1,740 | ​ | $ | (10) | ​ | $ | 9,990 | ​ | $ | (15) | ​ | $ | 11,730
Obligations of state and political agencies | ​ |  | (140) | ​ |  | 11,959 | ​ |  | (21) | ​ |  | 5,798 | ​ |  | (161) | ​ |  | 17,757
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (52) | ​ |  | 17,131 | ​ |  | (79) | ​ |  | 14,036 | ​ |  | (131) | ​ |  | 31,167
Commercial | ​ |  | (116) | ​ |  | 15,235 | ​ |  | (52) | ​ |  | 6,195 | ​ |  | (168) | ​ |  | 21,430
Asset backed securities | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Total available-for-sale investment securities | ​ | $ | (313) | ​ | $ | 46,067 | ​ | $ | (162) | ​ | $ | 36,019 | ​ | $ | (475) | ​ | $ | 82,086
Schedule of federal home loan bank | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
(dollars in thousands) |  | 2020 |  | 2019
Federal Reserve | ​ | $ | 2,675 | ​ | $ | 2,675
FHLB | ​ |  | 3,090 | ​ |  | 3,080

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