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Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | # of Securities
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Fair | ​ | in unrealized
(dollars in thousands) |  | cost |  | gains |  | losses |  | value | ​ | loss position
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. asset backed securities | ​ | $ | 26,828 | ​ | 458 | ​ | (56) | ​ | 27,230 | ​ | 7
U.S. government agency mortgage-backed securities | ​ | ​ | 3,796 | ​ | 126 | ​ | — | ​ | 3,922 | ​ | —
U.S. government agency collateralized mortgage obligations | ​ | ​ | 23,014 | ​ | 642 | ​ | (137) | ​ | 23,519 | ​ | 5
State and municipal securities | ​ | ​ | 72,815 | ​ | 704 | ​ | (871) | ​ | 72,648 | ​ | 30
U.S. Treasuries | ​ | ​ | 1,938 | ​ | — | ​ | (22) | ​ | 1,916 | ​ | 1
Corporate bonds | ​ | ​ | 4,950 | ​ | 17 | ​ | (37) | ​ | 4,930 | ​ | 4
Total securities available-for-sale | ​ | $ | 133,341 | ​ | 1,947 | ​ | (1,123) | ​ | 134,165 | ​ | 47
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State and municipal securities | ​ | ​ | 6,476 | ​ | 296 | ​ | — | ​ | 6,772 | ​ | —
Total securities held-to-maturity | ​ | $ | 6,476 | ​ | 296 | ​ | — | ​ | 6,772 | ​ | —
​ ​ ​ ​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | # of Securities
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Fair | ​ | in unrealized
(dollars in thousands) |  | cost |  | gains |  | losses |  | value | ​ | loss position
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. asset backed securities | ​ | $ | 25,303 | ​ | 364 | ​ | (75) | ​ | 25,592 | ​ | 8
U.S. government agency mortgage-backed securities | ​ | ​ | 3,854 | ​ | 192 | ​ | — | ​ | 4,046 | ​ | —
U.S. government agency collateralized mortgage obligations | ​ | ​ | 23,010 | ​ | 916 | ​ | (17) | ​ | 23,909 | ​ | 1
State and municipal securities | ​ | ​ | 63,848 | ​ | 2,025 | ​ | (63) | ​ | 65,810 | ​ | 3
Corporate bonds | ​ | ​ | 4,200 | ​ | 7 | ​ | (2) | ​ | 4,205 | ​ | 2
Total securities available-for-sale | ​ | $ | 120,215 | ​ | 3,504 | ​ | (157) | ​ | 123,562 | ​ | 14
Securities held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
State and municipal securities | ​ | ​ | 6,510 | ​ | 347 | ​ | — | ​ | 6,857 | ​ | —
Total securities held-to-maturity | ​ | $ | 6,510 | ​ | 347 | ​ | — | ​ | 6,857 | ​ | —
Schedule of investment gross unrealized loss in continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | Less than 12 Months | ​ | 12 Months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(dollars in thousands) |  | value |  | losses |  | value |  | losses |  | value |  | losses
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. asset backed securities | ​ | $ | 948 | ​ | (24) | ​ | 8,373 | ​ | (32) | ​ | 9,321 | ​ | (56)
U.S. government agency collateralized mortgage obligations | ​ | ​ | 6,781 | ​ | (137) | ​ | — | ​ | — | ​ | 6,781 | ​ | (137)
State and municipal securities | ​ | ​ | 47,927 | ​ | (871) | ​ | — | ​ | — | ​ | 47,927 | ​ | (871)
U.S. Treasuries | ​ | ​ | 1,916 | ​ | (22) | ​ | ​ | ​ | ​ | ​ | 1,916 | ​ | (22)
Corporate bonds | ​ | ​ | 2,913 | ​ | (37) | ​ | — | ​ | — | ​ | 2,913 | ​ | (37)
Total securities available-for-sale | ​ | $ | 60,485 | ​ | (1,091) | ​ | 8,373 | ​ | (32) | ​ | 68,858 | ​ | (1,123)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Less than 12 Months | ​ | 12 Months or more | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(dollars in thousands) |  | value |  | losses |  | value |  | losses |  | value |  | losses
Securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. asset backed securities | ​ | $ | 2,884 | ​ | (4) | ​ | 7,443 | ​ | (71) | ​ | 10,327 | ​ | (75)
U.S. government agency collateralized mortgage obligations | ​ | ​ | 2,284 | ​ | (17) | ​ | — | ​ | — | ​ | 2,284 | ​ | (17)
State and municipal securities | ​ | ​ | 4,163 | ​ | (63) | ​ | — | ​ | — | ​ | 4,163 | ​ | (63)
Corporate bonds | ​ | ​ | 1,198 | ​ | (2) | ​ | — | ​ | — | ​ | 1,198 | ​ | (2)
Total securities available-for-sale | ​ | $ | 10,529 | ​ | (86) | ​ | 7,443 | ​ | (71) | ​ | 17,972 | ​ | (157)
Schedule of amortized cost and carrying value of held-to-maturity securities and available-for-sale securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ | ​ | Available-for-sale | ​ | Held-to-maturity | ​ | Available-for-sale | ​ | Held-to-maturity
​ | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | cost |  | value |  | cost |  | value |  | cost |  | value |  | cost |  | value
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | — | ​ | — | ​ | — | ​ | $ | — | ​ | — | ​ | — | ​ | —
Due after one year through five years | ​ | ​ | — | ​ | — | ​ | 3,165 | ​ | 3,255 | ​ | ​ | — | ​ | — | ​ | 3,181 | ​ | 3,288
Due after five years through ten years | ​ | ​ | 14,077 | ​ | 13,963 | ​ | 3,311 | ​ | 3,517 | ​ | ​ | 12,035 | ​ | 12,095 | ​ | 3,329 | ​ | 3,569
Due after ten years | ​ | ​ | 92,454 | ​ | 92,761 | ​ | — | ​ | — | ​ | ​ | 81,316 | ​ | 83,512 | ​ | — | ​ | —
Subtotal | ​ | ​ | 106,531 | ​ | 106,724 | ​ | 6,476 | ​ | 6,772 | ​ | ​ | 93,351 | ​ | 95,607 | ​ | 6,510 | ​ | 6,857
Mortgage-related securities | ​ | ​ | 26,810 | ​ | 27,441 | ​ | — | ​ | — | ​ | ​ | 26,864 | ​ | 27,955 | ​ | — | ​ | —
Total | ​ | $ | 133,341 | ​ | 134,165 | ​ | 6,476 | ​ | 6,772 | ​ | $ | 120,215 | ​ | 123,562 | ​ | 6,510 | ​ | 6,857

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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