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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 27,585 | $ 78,239
12 Months or More, Fair Value | 284 | 43,281
Less Than 12 Months, Unrealized Losses | 202 | 1,035
12 Months or More, Unrealized Losses | 1 | 118
Total, Fair Value | 27,869 | 121,520
Total, Unrealized Losses | 203 | 1,153
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 9,246 | 23,929
Less Than 12 Months, Unrealized Losses | 30 | 815
Total, Fair Value | 9,246 | 23,929
Total, Unrealized Losses | 30 | 815
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,786 | 2,684
12 Months or More, Fair Value |  | 1,098
Less Than 12 Months, Unrealized Losses | 37 | 19
12 Months or More, Unrealized Losses |  | 1
Total, Fair Value | 6,786 | 3,782
Total, Unrealized Losses | 37 | 20
U.S. government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 13,695
12 Months or More, Fair Value |  | 36,070
Less Than 12 Months, Unrealized Losses |  | 149
12 Months or More, Unrealized Losses |  | 78
Total, Fair Value |  | 49,765
Total, Unrealized Losses |  | 227
Mortgage-backed Securities, U.S. government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 992
12 Months or More, Fair Value |  | 2,362
Less Than 12 Months, Unrealized Losses |  | 1
12 Months or More, Unrealized Losses |  | 9
Total, Fair Value |  | 3,354
Total, Unrealized Losses |  | 10
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 11,553 | 36,939
12 Months or More, Fair Value | 284 | 3,751
Less Than 12 Months, Unrealized Losses | 135 | 51
12 Months or More, Unrealized Losses | 1 | 30
Total, Fair Value | 11,837 | 40,690
Total, Unrealized Losses | $ 136 | $ 81

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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