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Investment securities - Restricted Investment In Stock (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |  |
Gross realized gains | $ |  |  | $ 23 |
Number of securities in continuous unrealized loss position |  |  | 72 |
Other-than-temporary impairments recognized | $ |  |  | $ 0 |
State and Municipals, Tax-exempt |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of securities in continuous unrealized loss position |  |  | 10 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  | 2 |
State and Municipals, Taxable |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of securities in continuous unrealized loss position |  |  | 9 |
U.S. Treasuries |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of securities in continuous unrealized loss position |  |  | 4 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  | 2 |
U.S. Government-sponsored enterprises state and municipals |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of securities in continuous unrealized loss position |  |  | 25 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  | 17 |
Other-than-temporary impairments recognized | $ | $ 0 | $ 0 | $ 0 | $ 0
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |  |  |
Available-for-sale and Held-to-maturity securities |  |  |  |
Number of securities in continuous unrealized loss position |  |  | 24 |
Number of securities in continuous unrealized loss positions 12 months or longer |  |  | 20 |

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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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