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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 78,239 | $ 25,905
12 Months or More, Fair Value | 43,281 | 189,472
Less Than 12 Months, Unrealized Losses | 1,035 | 132
12 Months or More, Unrealized Losses | 118 | 3,924
Total, Fair Value | 121,520 | 215,377
Total, Unrealized Losses | 1,153 | 4,056
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 23,929 |
Less Than 12 Months, Unrealized Losses | 815 |
Total, Fair Value | 23,929 |
Total, Unrealized Losses | 815 |
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 2,684 | 9,022
12 Months or More, Fair Value | 1,098 | 52,352
Less Than 12 Months, Unrealized Losses | 19 | 74
12 Months or More, Unrealized Losses | 1 | 714
Total, Fair Value | 3,782 | 61,374
Total, Unrealized Losses | 20 | 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 |  | 19,671
Less Than 12 Months, Unrealized Losses |  | 2
12 Months or More, Unrealized Losses |  | 363
Total, Fair Value |  | 21,666
Total, Unrealized Losses |  | 365
U.S. government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 13,695 | 2,037
12 Months or More, Fair Value | 36,070 | 89,729
Less Than 12 Months, Unrealized Losses | 149 | 1
12 Months or More, Unrealized Losses | 78 | 2,182
Total, Fair Value | 49,765 | 91,766
Total, Unrealized Losses | 227 | 2,183
Mortgage-backed Securities, U.S. government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 992 |
12 Months or More, Fair Value | 2,362 | 7,800
Less Than 12 Months, Unrealized Losses | 1 |
12 Months or More, Unrealized Losses | 9 | 84
Total, Fair Value | 3,354 | 7,800
Total, Unrealized Losses | 10 | 84
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
12 Months or More, Fair Value |  | 6,039
12 Months or More, Unrealized Losses |  | 230
Total, Fair Value |  | 6,039
Total, Unrealized Losses |  | 230
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 36,939 | 12,851
12 Months or More, Fair Value | 3,751 | 13,881
Less Than 12 Months, Unrealized Losses | 51 | 55
12 Months or More, Unrealized Losses | 30 | 351
Total, Fair Value | 40,690 | 26,732
Total, Unrealized Losses | $ 81 | $ 406

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