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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, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 53,295 | $ 25,905
12 Months or More, Fair Value | 54,899 | 189,472
Less Than 12 Months, Unrealized Losses | 411 | 132
12 Months or More, Unrealized Losses | 297 | 3,924
Total, Fair Value | 108,194 | 215,377
Total, Unrealized Losses | 708 | 4,056
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 8,970 |
Less Than 12 Months, Unrealized Losses | 238 |
Total, Fair Value | 8,970 |
Total, Unrealized Losses | 238 |
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,139 | 9,022
12 Months or More, Fair Value | 1,101 | 52,352
Less Than 12 Months, Unrealized Losses | 29 | 74
12 Months or More, Unrealized Losses | 2 | 714
Total, Fair Value | 7,240 | 61,374
Total, Unrealized Losses | 31 | 788
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 4,524 | 1,995
12 Months or More, Fair Value | 5,482 | 19,671
Less Than 12 Months, Unrealized Losses | 2 | 2
12 Months or More, Unrealized Losses | 15 | 363
Total, Fair Value | 10,006 | 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 | 29,242 | 2,037
12 Months or More, Fair Value | 38,468 | 89,729
Less Than 12 Months, Unrealized Losses | 129 | 1
12 Months or More, Unrealized Losses | 211 | 2,182
Total, Fair Value | 67,710 | 91,766
Total, Unrealized Losses | 340 | 2,183
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 423 |
12 Months or More, Fair Value | 4,346 | 7,800
Less Than 12 Months, Unrealized Losses | 1 |
12 Months or More, Unrealized Losses | 17 | 84
Total, Fair Value | 4,769 | 7,800
Total, Unrealized Losses | 18 | 84
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 3,997 |
12 Months or More, Fair Value | 5,502 | 6,039
Less Than 12 Months, Unrealized Losses | 12 |
12 Months or More, Unrealized Losses | 52 | 230
Total, Fair Value | 9,499 | 6,039
Total, Unrealized Losses | $ 64 | 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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