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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Investment Securities |  |
Available-for-sale, Amortized Cost | $ 286,215 | $ 328,643
Available-for-sale, Gross Unrealized Gains | 9,899 | 2,988
Available-for-sale, Gross Unrealized Losses | 203 | 1,153
Available-for-sale, Fair Value | 295,911 | 330,478
Held-to-maturity, Amortized Cost | 7,225 | 7,656
Held-to-maturity, Gross Unrealized Gains | 288 | 233
Held-to-maturity, Fair value | 7,513 | 7,889
U.S. Treasuries |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 18,478 | 23,966
Available-for-sale, Gross Unrealized Gains | 427 | 162
Available-for-sale, Fair Value | 18,905 | 24,128
U.S. government-sponsored enterprises state and municipals |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 63,834 | 87,156
Available-for-sale, Gross Unrealized Gains | 1,354 | 181
Available-for-sale, Gross Unrealized Losses |  | 227
Available-for-sale, Fair Value | 65,188 | 87,110
Mortgage-backed Securities, U.S. government agencies |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 3,553 | 8,368
Available-for-sale, Gross Unrealized Gains | 154 | 112
Available-for-sale, Gross Unrealized Losses |  | 10
Available-for-sale, Fair Value | 3,707 | 8,470
Held-to-maturity, Amortized Cost | 21 | 31
Held-to-maturity, Fair value | 21 | 31
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 79,457 | 101,914
Available-for-sale, Gross Unrealized Gains | 1,930 | 1,011
Available-for-sale, Gross Unrealized Losses | 136 | 77
Available-for-sale, Fair Value | 81,251 | 102,848
Held-to-maturity, Amortized Cost | 355 | 773
Held-to-maturity, Gross Unrealized Gains | 13 | 25
Held-to-maturity, Fair value | 368 | 798
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 12,619 | 12,694
Available-for-sale, Gross Unrealized Gains | 881 | 171
Available-for-sale, Gross Unrealized Losses |  | 4
Available-for-sale, Fair Value | 13,500 | 12,861
Corporate debt securities |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 1,000 |
Available-for-sale, Fair Value | 1,000 |
State and Municipals, Taxable |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 53,297 | 35,418
Available-for-sale, Gross Unrealized Gains | 2,099 | 295
Available-for-sale, Gross Unrealized Losses | 30 | 815
Available-for-sale, Fair Value | 55,366 | 34,898
Held-to-maturity, Amortized Cost | 6,849 |
Held-to-maturity, Gross Unrealized Gains | 275 |
Held-to-maturity, Fair value | 7,124 |
State and Municipals, Tax-exempt |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 53,977 | 59,127
Available-for-sale, Gross Unrealized Gains | 3,054 | 1,056
Available-for-sale, Gross Unrealized Losses | 37 | 20
Available-for-sale, Fair Value | $ 56,994 | 60,163
Held-to-maturity, Amortized Cost |  | 6,852
Held-to-maturity, Gross Unrealized Gains |  | 208
Held-to-maturity, Fair value |  | $ 7,060

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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