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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, 2018 USD ($) | Dec. 31, 2019 USD ($) security
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | $ 272,933 | $ 328,643
Available-for-sale, Gross Unrealized Gains | 757 | 2,988
Available-for-sale, Gross Unrealized Losses | 4,008 | 1,153
Available-for-sale, Fair Value | 269,682 | 330,478
Held-to-maturity, Amortized Cost | 8,361 | 7,656
Held-to-maturity, Gross Unrealized Gains | 67 | 233
Held-to-maturity, Gross Unrealized Losses | 48 |
Held-to-maturity, Fair value | 8,380 | 7,889
Equity investments carried at fair value | 291 | $ 423
Number of equity securities portfolio consisting of stock of other financial institutions | security |  | 2
Net unrealized gains recognized in AOCI | 3 |
Mortgage-backed Securities, U.S. government agencies |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 12,663 | $ 8,368
Available-for-sale, Gross Unrealized Gains | 50 | 112
Available-for-sale, Gross Unrealized Losses | 84 | 10
Available-for-sale, Fair Value | 12,629 | 8,470
Held-to-maturity, Amortized Cost | 42 | 31
Held-to-maturity, Fair value | 42 | 31
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 33,149 | 101,914
Available-for-sale, Gross Unrealized Gains | 49 | 1,011
Available-for-sale, Gross Unrealized Losses | 401 | 77
Available-for-sale, Fair Value | 32,797 | 102,848
Held-to-maturity, Amortized Cost | 1,464 | 773
Held-to-maturity, Gross Unrealized Gains | 55 | 25
Held-to-maturity, Gross Unrealized Losses | 5 |
Held-to-maturity, Fair value | 1,514 | 798
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 6,269 | 12,694
Available-for-sale, Gross Unrealized Gains |  | 171
Available-for-sale, Gross Unrealized Losses | 230 | 4
Available-for-sale, Fair Value | 6,039 | 12,861
U.S. government-sponsored enterprises state and municipals |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 94,999 | 87,156
Available-for-sale, Gross Unrealized Gains | 2 | 181
Available-for-sale, Gross Unrealized Losses | 2,183 | 227
Available-for-sale, Fair Value | 92,818 | 87,110
U.S. Treasuries |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 25,948 | 23,966
Available-for-sale, Gross Unrealized Gains | 9 | 162
Available-for-sale, Gross Unrealized Losses | 365 |
Available-for-sale, Fair Value | 25,592 | 24,128
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Equity investments carried at fair value | 291 | 423
State and Municipals, Taxable |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 13,544 | 35,418
Available-for-sale, Gross Unrealized Gains | 309 | 295
Available-for-sale, Gross Unrealized Losses |  | 815
Available-for-sale, Fair Value | 13,853 | 34,898
Held-to-maturity, Amortized Cost |  | 6,852
Held-to-maturity, Gross Unrealized Gains |  | 208
Held-to-maturity, Fair value |  | 7,060
State and Municipals, Tax-exempt |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 86,361 | 59,127
Available-for-sale, Gross Unrealized Gains | 338 | 1,056
Available-for-sale, Gross Unrealized Losses | 745 | 20
Available-for-sale, Fair Value | 85,954 | $ 60,163
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 |

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