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Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value | $ 167,138 | $ 63,074
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (1,035) | (394)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value | 0 | 175,730
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (1,497)
Debt securities, available-for-sale, continuous unrealized loss position, fair value | 167,138 | 238,804
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1,035) | (1,891)
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value | 107,236 | 47,641
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (320) | (164)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value | 0 | 175,730
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (1,497)
Debt securities, available-for-sale, continuous unrealized loss position, fair value | 107,236 | 223,371
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (320) | (1,661)
Municipals, tax exempt |  |
Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value | 56,923 | 15,433
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (694) | (230)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | 0
Debt securities, available-for-sale, continuous unrealized loss position, fair value | 56,923 | 15,433
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (694) | $ (230)
Corporate securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value | 985 |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (15) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value | 0 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 |
Debt securities, available-for-sale, continuous unrealized loss position, fair value | 985 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (15) |
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value | 1,994 |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (6) |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value | 0 |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 |
Debt securities, available-for-sale, continuous unrealized loss position, fair value | 1,994 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss | $ (6) |

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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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