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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Available-for-sale and Held-to-maturity securities |  |  |
Carrying value of securities pledged | $ | $ 163,936 | $ 144,750 |
State and Municipals, Tax-exempt |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
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 positions 12 months or longer | 20 |  |
Other-than-temporary impairments recognized | $ | $ 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 positions 12 months or longer | 17 |  |
U.S. Treasuries |  |  |
Available-for-sale and Held-to-maturity securities |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | 1 |  |

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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- Definition The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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