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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investment Securities |
Schedule of amortized cost and fair value of debt securities available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Total | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Gross Unrealized | ​ | Fair
(in thousands) |  | Cost |  | Gains |  | Losses |  | Value
December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Treasury | ​ | $ | 2,772 | ​ | $ | 26 | ​ | $ | — | ​ | $ | 2,798
U.S. government and federal agency obligations | ​ |  | 11,732 | ​ |  | 197 | ​ |  | — | ​ |  | 11,929
U.S. government-sponsored enterprises | ​ |  | 22,495 | ​ |  | 379 | ​ |  | — | ​ |  | 22,874
Obligations of states and political subdivisions | ​ |  | 56,943 | ​ |  | 1,801 | ​ |  | — | ​ |  | 58,744
Mortgage-backed securities | ​ | ​ | 88,357 | ​ | ​ | 1,809 | ​ | ​ | (54) | ​ | ​ | 90,112
Other debt securities (a) | ​ |  | 10,000 | ​ |  | 358 | ​ |  | (14) | ​ |  | 10,344
Bank issued trust preferred securities (a) | ​ |  | 1,486 | ​ |  | — | ​ |  | (257) | ​ |  | 1,229
Total available-for-sale securities | ​ | $ | 193,785 | ​ | $ | 4,570 | ​ | $ | (325) | ​ | $ | 198,030
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. Treasury | ​ | $ | 987 | ​ | $ | 8 | ​ | $ | — | ​ | $ | 995
U.S. government and federal agency obligations | ​ |  | 8,124 | ​ |  | — | ​ |  | (77) | ​ |  | 8,047
U.S. government-sponsored enterprises | ​ |  | 22,300 | ​ |  | 41 | ​ |  | (58) | ​ |  | 22,283
Obligations of states and political subdivisions | ​ |  | 33,704 | ​ |  | 144 | ​ |  | (59) | ​ |  | 33,789
Mortgage-backed securities | ​ | ​ | 105,522 | ​ | ​ | 522 | ​ | ​ | (428) | ​ |  | 105,616
Other debt securities (a) | ​ |  | 3,000 | ​ |  | 53 | ​ |  | — | ​ |  | 3,053
Bank issued trust preferred securities (a) | ​ |  | 1,486 | ​ |  | — | ​ |  | (176) | ​ |  | 1,310
Total available-for-sale securities | ​ | $ | 175,123 | ​ | $ | 768 | ​ | $ | (798) | ​ | $ | 175,093
​ (a) Certain hybrid instruments possessing characteristics typically associated with debt obligations.
Schedule of amortized cost and fair value of debt securities classified as available-for-sale by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized |  | Fair
(in thousands) | ​ | Cost | ​ | Value
Due in one year or less | ​ | $ | 3,323 | ​ | $ | 3,340
Due after one year through five years | ​ |  | 21,829 | ​ |  | 22,071
Due after five years through ten years | ​ |  | 38,404 | ​ |  | 39,570
Due after ten years | ​ |  | 41,872 | ​ |  | 42,937
Total | ​ |  | 105,428 | ​ |  | 107,918
Mortgage-backed securities | ​ |  | 88,357 | ​ |  | 90,112
Total available-for-sale securities | ​ | $ | 193,785 | ​ | $ | 198,030
Schedule of Other securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019 | ​
Other securities: |  | ​ |  |  | ​ |  | ​
FHLB stock | ​ | $ | 6,170 | ​ | $ | 5,644 | ​
MIB stock | ​ |  | 151 | ​ |  | 151 | ​
Equity securities with readily determinable fair values | ​ |  | 32 | ​ |  | 13 | ​
Total other investment securities | ​ | $ | 6,353 | ​ | $ | 5,808 | ​
Schedule of gross unrealized losses on debt securities and fair value of related securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(in thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
At December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Treasury | ​ | $ | 1,015 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 1,015 | ​ | $ | —
Mortgage-backed securities | ​ | ​ | 7,494 | ​ | ​ | (54) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,494 | ​ | ​ | (54)
Other debt securities | ​ | ​ | 2,987 | ​ | ​ | (14) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,987 | ​ | ​ | (14)
Bank issued trust preferred securities | ​ |  | — | ​ |  | — | ​ |  | 1,229 | ​ |  | (257) | ​ |  | 1,229 | ​ |  | (257)
Total | ​ | $ | 11,496 | ​ | $ | (68) | ​ | $ | 1,229 | ​ | $ | (257) | ​ | $ | 12,725 | ​ | $ | (325)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
At December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government and federal agency obligations | ​ | $ | 6,238 | ​ | $ | (69) | ​ | $ | 1,809 | ​ | $ | (8) | ​ | $ | 8,047 | ​ | $ | (77)
U.S. government-sponsored enterprises | ​ |  | 5,949 | ​ |  | (47) | ​ |  | 7,488 | ​ |  | (11) | ​ |  | 13,437 | ​ |  | (58)
Obligations of states and political subdivisions | ​ |  | 10,729 | ​ | ​ | (53) | ​ | ​ | 1,931 | ​ | ​ | (6) | ​ |  | 12,660 | ​ |  | (59)
Mortgage-backed securities | ​ | ​ | 5,444 | ​ | ​ | (37) | ​ | ​ | 40,120 | ​ | ​ | (391) | ​ | ​ | 45,564 | ​ | ​ | (428)
Bank issued trust preferred securities | ​ | ​ | — | ​ |  | — | ​ |  | 1,310 | ​ |  | (176) | ​ |  | 1,310 | ​ | ​ | (176)
Total | ​ | $ | 28,360 | ​ | $ | (206) | ​ | $ | 52,658 | ​ | $ | (592) | ​ | $ | 81,018 | ​ | $ | (798)
Schedule of components of investment securities gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019 |  | 2018
Investment securities gains (losses), net |  | ​ |  |  | ​ |  |  | ​ |
Available for sale securities: |  | ​ |  |  | ​ |  |  | ​ |
Gains realized on sales | ​ | $ | 49 | ​ | $ | 6 | ​ | $ | 253
Losses realized on sales | ​ |  | (8) | ​ |  | (46) | ​ |  | —
Other-than-temporary impairment recognized | ​ |  | — | ​ |  | — | ​ |  | —
Other investment securities: | ​ |  |  | ​ |  |  | ​ |  |
Fair value adjustments, net | ​ |  | 20 | ​ |  | — | ​ |  | 2
Investment securities gains (losses), net | ​ | $ | 61 | ​ | $ | (40) | ​ | $ | 255

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