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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 98,864 | $ 145,428
Less Than 12 Months, Unrealized Losses | 967 | 2,470
12 Months or More, Fair Value | 6,897 | 4,434
12 Months or More, Unrealized Losses | 106 | 94
Total, Fair Value | 105,761 | 149,862
Total, Unrealized Losses | 1,073 | 2,564
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 554 | 1,035
Less Than 12 Months, Unrealized Losses | 1 | 39
Total, Fair Value | 554 | 1,035
Total, Unrealized Losses | 1 | 39
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 15,898 | 55,166
Less Than 12 Months, Unrealized Losses | 62 | 707
12 Months or More, Fair Value |  | 226
Total, Fair Value | 15,898 | 55,392
Total, Unrealized Losses | 62 | 707
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 2,501 | 7,438
Less Than 12 Months, Unrealized Losses | 23 | 132
Total, Fair Value | 2,501 | 7,438
Total, Unrealized Losses | 23 | 132
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 65,845 | 59,460
Less Than 12 Months, Unrealized Losses | 823 | 1,480
12 Months or More, Fair Value | 1,067 |
12 Months or More, Unrealized Losses | 24 |
Total, Fair Value | 66,912 | 59,460
Total, Unrealized Losses | 847 | 1,480
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 2,848 | 5,917
Less Than 12 Months, Unrealized Losses | 8 | 27
12 Months or More, Fair Value | 3,503 | 1,496
12 Months or More, Unrealized Losses | 21 | 20
Total, Fair Value | 6,351 | 7,413
Total, Unrealized Losses | 29 | 47
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 11,218 | 16,412
Less Than 12 Months, Unrealized Losses | 50 | 85
12 Months or More, Fair Value | 2,327 | 2,712
12 Months or More, Unrealized Losses | 61 | 74
Total, Fair Value | 13,545 | 19,124
Total, Unrealized Losses | $ 111 | $ 159

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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