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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, 2019 | Dec. 31, 2018
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | $ 25,905
12 Months or More, Fair Value | $ 113,437 | 189,472
Less Than 12 Months, Unrealized Losses |  | 132
12 Months or More, Unrealized Losses | 585 | 3,924
Total, Fair Value | 113,437 | 215,377
Total, Unrealized Losses | 585 | 4,056
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 9,022
12 Months or More, Fair Value | 14,499 | 52,352
Less Than 12 Months, Unrealized Losses |  | 74
12 Months or More, Unrealized Losses | 32 | 714
Total, Fair Value | 14,499 | 61,374
Total, Unrealized Losses | 32 | 788
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 1,995
12 Months or More, Fair Value | 7,993 | 19,671
Less Than 12 Months, Unrealized Losses |  | 2
12 Months or More, Unrealized Losses | 17 | 363
Total, Fair Value | 7,993 | 21,666
Total, Unrealized Losses | 17 | 365
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 2,037
12 Months or More, Fair Value | 75,292 | 89,729
Less Than 12 Months, Unrealized Losses |  | 1
12 Months or More, Unrealized Losses | 423 | 2,182
Total, Fair Value | 75,292 | 91,766
Total, Unrealized Losses | 423 | 2,183
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
12 Months or More, Fair Value | 5,281 | 7,800
12 Months or More, Unrealized Losses | 20 | 84
Total, Fair Value | 5,281 | 7,800
Total, Unrealized Losses | 20 | 84
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
12 Months or More, Fair Value | 10,372 | 6,039
12 Months or More, Unrealized Losses | 93 | 230
Total, Fair Value | 10,372 | 6,039
Total, Unrealized Losses | $ 93 | 230
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 12,851
12 Months or More, Fair Value |  | 13,881
Less Than 12 Months, Unrealized Losses |  | 55
12 Months or More, Unrealized Losses |  | 351
Total, Fair Value |  | 26,732
Total, Unrealized Losses |  | $ 406

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