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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 151,070 | $ 145,428
Less Than 12 Months, Unrealized Losses | 2,066 | 2,470
12 Months or More, Fair Value | 3,717 | 4,434
12 Months or More, Unrealized Losses | 65 | 94
Total, Fair Value | 154,787 | 149,862
Total, Unrealized Losses | 2,131 | 2,564
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 1,035
Less Than 12 Months, Unrealized Losses |  | 39
Total, Fair Value |  | 1,035
Total, Unrealized Losses |  | 39
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 51,467 | 55,166
Less Than 12 Months, Unrealized Losses | 544 | 707
12 Months or More, Fair Value |  | 226
Total, Fair Value | 51,467 | 55,392
Total, Unrealized Losses | 544 | 707
U.S. Treasury securities |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 17,411 | 7,438
Less Than 12 Months, Unrealized Losses | 156 | 132
Total, Fair Value | 17,411 | 7,438
Total, Unrealized Losses | 156 | 132
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 62,591 | 59,460
Less Than 12 Months, Unrealized Losses | 1,277 | 1,480
Total, Fair Value | 62,591 | 59,460
Total, Unrealized Losses | 1,277 | 1,480
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,769 | 5,917
Less Than 12 Months, Unrealized Losses | 23 | 27
12 Months or More, Fair Value | 1,337 | 1,496
12 Months or More, Unrealized Losses | 13 | 20
Total, Fair Value | 7,106 | 7,413
Total, Unrealized Losses | 36 | 47
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 13,832 | 16,412
Less Than 12 Months, Unrealized Losses | 66 | 85
12 Months or More, Fair Value | 2,380 | 2,712
12 Months or More, Unrealized Losses | 52 | 74
Total, Fair Value | 16,212 | 19,124
Total, Unrealized Losses | $ 118 | $ 159

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