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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) security
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | $ 273,742 | $ 272,933
Available-for-sale, Gross Unrealized Gains | 1,666 | 757
Available-for-sale, Gross Unrealized Losses | 2,906 | 4,008
Available-for-sale, Fair Value | 272,502 | 269,682
Available-for-sale, Fair Value | 272,502 | 269,682
Held-to-maturity, Amortized Cost | 9,274 | 8,361
Held-to-maturity, Gross Unrealized Gains | 290 | 67
Held-to-maturity, Gross Unrealized Losses | 17 | 48
Held-to-maturity, Fair value | 9,547 | 8,380
Equity investments carried at fair value | 46 | $ 291
Number of equity securities portfolio consisting of stock of other financial institutions | security |  | 2
Net unrealized gains recognized in AOCI | 3 |
State and Municipals Tax-exempt Bonds |  |
Schedule of Trading Securities and Other Trading Assets |  |
Held-to-maturity, Amortized Cost |  | $ 6,855
Held-to-maturity, Gross Unrealized Gains |  | 12
Held-to-maturity, Gross Unrealized Losses |  | 43
Held-to-maturity, Fair value |  | 6,824
Mortgage-backed Securities, U.S. Government agencies |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 14,517 | 12,663
Available-for-sale, Gross Unrealized Gains | 2 | 50
Available-for-sale, Gross Unrealized Losses | 85 | 84
Available-for-sale, Fair Value | 14,434 | 12,629
Held-to-maturity, Amortized Cost | 54 | 42
Held-to-maturity, Fair value | 54 | 42
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 19,752 | 33,149
Available-for-sale, Gross Unrealized Gains | 10 | 49
Available-for-sale, Gross Unrealized Losses | 231 | 401
Available-for-sale, Fair Value | 19,531 | 32,797
Held-to-maturity, Amortized Cost | 2,361 | 1,464
Held-to-maturity, Gross Unrealized Gains | 138 | 55
Held-to-maturity, Gross Unrealized Losses | 4 | 5
Held-to-maturity, Fair value | 2,495 | 1,514
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 6,315 | 6,269
Available-for-sale, Gross Unrealized Losses | 120 | 230
Available-for-sale, Fair Value | 6,195 | 6,039
U.S. Government-sponsored enterprises state and municipals |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 95,358 | 94,999
Available-for-sale, Gross Unrealized Gains | 30 | 2
Available-for-sale, Gross Unrealized Losses | 1,740 | 2,183
Available-for-sale, Fair Value | 93,648 | 92,818
U.S. Treasuries |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 20,042 | 25,948
Available-for-sale, Gross Unrealized Gains |  | 9
Available-for-sale, Gross Unrealized Losses | 228 | 365
Available-for-sale, Fair Value | 19,814 | 25,592
State and Municipals, Taxable |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 14,559 | 13,544
Available-for-sale, Gross Unrealized Gains | 488 | 309
Available-for-sale, Fair Value | 15,047 | 13,853
State and Municipals, Tax-exempt |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 103,199 | 86,361
Available-for-sale, Gross Unrealized Gains | 1,136 | 338
Available-for-sale, Gross Unrealized Losses | 502 | 745
Available-for-sale, Fair Value | 103,833 | $ 85,954
Held-to-maturity, Amortized Cost | 6,859 |
Held-to-maturity, Gross Unrealized Gains | 152 |
Held-to-maturity, Gross Unrealized Losses | 13 |
Held-to-maturity, Fair value | $ 6,998 |

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