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Investment securities - Restricted Investment In Stock (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) security | Mar. 31, 2018 USD ($)
Available-for-sale and Held-to-maturity securities |  |
Number of securities in continuous unrealized loss position | 137 |
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 | 60 |
Number of securities in continuous unrealized loss positions 12 months or longer | 57 |
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Number of securities in continuous unrealized loss position | 7 |
Number of securities in continuous unrealized loss positions 12 months or longer | 7 |
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Number of securities in continuous unrealized loss position | 35 |
Number of securities in continuous unrealized loss positions 12 months or longer | 35 |
Other-than-temporary impairments recognized | $ | $ 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 | 35 |
Number of securities in continuous unrealized loss positions 12 months or longer | 32 |

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