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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 288,190 | $ 27,585
12 Months or More, Fair Value | 11,352 | 284
Less Than 12 Months, Unrealized Losses | 5,204 | 202
12 Months or More, Unrealized Losses | 335 | 1
Total, Fair Value | 299,542 | 27,869
Total, Unrealized Losses | 5,539 | 203
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 29,122 | 9,246
12 Months or More, Fair Value | 4,283 |
Less Than 12 Months, Unrealized Losses | 771 | 30
12 Months or More, Unrealized Losses | 178 |
Total, Fair Value | 33,405 | 9,246
Total, Unrealized Losses | 949 | 30
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 52,825 | 6,786
Less Than 12 Months, Unrealized Losses | 1,087 | 37
Total, Fair Value | 52,825 | 6,786
Total, Unrealized Losses | 1,087 | 37
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 102,789 |
Less Than 12 Months, Unrealized Losses | 610 |
Total, Fair Value | 102,789 |
Total, Unrealized Losses | 610 |
Mortgage-backed Securities, U.S. government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 11,279 |
Less Than 12 Months, Unrealized Losses | 195 |
Total, Fair Value | 11,279 |
Total, Unrealized Losses | 195 |
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 89,214 | 11,553
12 Months or More, Fair Value | 7,069 | 284
Less Than 12 Months, Unrealized Losses | 2,502 | 135
12 Months or More, Unrealized Losses | 157 | 1
Total, Fair Value | 96,283 | 11,837
Total, Unrealized Losses | 2,659 | $ 136
Corporate debt securities |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 2,961 |
Less Than 12 Months, Unrealized Losses | 39 |
Total, Fair Value | 2,961 |
Total, Unrealized Losses | $ 39 |

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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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