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Investment securities - Restricted Investment In Stock (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($) security | Jun. 30, 2018 USD ($)
Available-for-sale and Held-to-maturity securities |  |
Proceeds from sale of available-for-sale investment securities | $ | $ 9,677 |
Gross realized gains | $ | $ 23 |
Number of securities in continuous unrealized loss position | 73 |
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 | 20 |
Number of securities in continuous unrealized loss positions 12 months or longer | 20 |
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Number of securities in continuous unrealized loss position | 3 |
Number of securities in continuous unrealized loss positions 12 months or longer | 3 |
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Number of securities in continuous unrealized loss position | 28 |
Number of securities in continuous unrealized loss positions 12 months or longer | 28 |
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 | 22 |
Number of securities in continuous unrealized loss positions 12 months or longer | 20 |

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