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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 80,352 | $ 145,428
Less Than 12 Months, Unrealized Losses | 579 | 2,470
12 Months or More, Fair Value | 39,741 | 4,434
12 Months or More, Unrealized Losses | 632 | 94
Total, Fair Value | 120,093 | 149,862
Total, Unrealized Losses | 1,211 | 2,564
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 551 | 1,035
Less Than 12 Months, Unrealized Losses | 2 | 39
Total, Fair Value | 551 | 1,035
Total, Unrealized Losses | 2 | 39
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,330 | 55,166
Less Than 12 Months, Unrealized Losses | 50 | 707
12 Months or More, Fair Value | 2,482 | 226
12 Months or More, Unrealized Losses | 3 |
Total, Fair Value | 7,812 | 55,392
Total, Unrealized Losses | 53 | 707
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,494 | 7,438
Less Than 12 Months, Unrealized Losses | 28 | 132
Total, Fair Value | 5,494 | 7,438
Total, Unrealized Losses | 28 | 132
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 48,573 | 59,460
Less Than 12 Months, Unrealized Losses | 376 | 1,480
12 Months or More, Fair Value | 29,309 |
12 Months or More, Unrealized Losses | 539 |
Total, Fair Value | 77,882 | 59,460
Total, Unrealized Losses | 915 | 1,480
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,671 | 5,917
Less Than 12 Months, Unrealized Losses | 13 | 27
12 Months or More, Fair Value | 3,175 | 1,496
12 Months or More, Unrealized Losses | 20 | 20
Total, Fair Value | 8,846 | 7,413
Total, Unrealized Losses | 33 | 47
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,241 |
Less Than 12 Months, Unrealized Losses | 85 |
Total, Fair Value | 6,241 |
Total, Unrealized Losses | 85 |
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 8,492 | 16,412
Less Than 12 Months, Unrealized Losses | 25 | 85
12 Months or More, Fair Value | 4,775 | 2,712
12 Months or More, Unrealized Losses | 70 | 74
Total, Fair Value | 13,267 | 19,124
Total, Unrealized Losses | $ 95 | $ 159

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