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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) $ in Thousands | Mar. 31, 2019 USD ($) company | Dec. 31, 2018 USD ($)
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Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | $ 271,196 | $ 272,933
Available-for-sale, Gross Unrealized Gains | 1,331 | 757
Available-for-sale, Gross Unrealized Losses | 2,143 | 4,008
Available-for-sale, Fair Value | 270,384 | 269,682
Held-to-maturity, Amortized Cost | 8,162 | 8,361
Held-to-maturity, Gross Unrealized Gains | 151 | 67
Held-to-maturity, Gross Unrealized Losses | 3 | 48
Held-to-maturity, Fair value | 8,310 | 8,380
Equity investments carried at fair value | $ 292 | 291
Number of equity securities portfolio consisting of stock of other financial institutions | company | 2 |
Fair value of equity portfolio in excess of cost basis | $ 15 |
Mortgage-backed Securities, U.S. Government agencies |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 11,716 | 12,663
Available-for-sale, Gross Unrealized Gains | 80 | 50
Available-for-sale, Gross Unrealized Losses | 56 | 84
Available-for-sale, Fair Value | 11,740 | 12,629
Held-to-maturity, Amortized Cost | 40 | 42
Held-to-maturity, Fair value | 40 | 42
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 39,064 | 33,149
Available-for-sale, Gross Unrealized Gains | 408 | 49
Available-for-sale, Gross Unrealized Losses | 202 | 401
Available-for-sale, Fair Value | 39,270 | 32,797
Held-to-maturity, Amortized Cost | 1,267 | 1,464
Held-to-maturity, Gross Unrealized Gains | 32 | 55
Held-to-maturity, Gross Unrealized Losses | 3 | 5
Held-to-maturity, Fair value | 1,296 | 1,514
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 6,258 | 6,269
Available-for-sale, Gross Unrealized Losses | 111 | 230
Available-for-sale, Fair Value | 6,147 | 6,039
U.S. Government-sponsored enterprises state and municipals |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 93,914 | 94,999
Available-for-sale, Gross Unrealized Gains | 9 | 2
Available-for-sale, Gross Unrealized Losses | 1,373 | 2,183
Available-for-sale, Fair Value | 92,550 | 92,818
U.S. Treasuries |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 23,954 | 25,948
Available-for-sale, Gross Unrealized Gains | 35 | 9
Available-for-sale, Gross Unrealized Losses | 232 | 365
Available-for-sale, Fair Value | 23,757 | 25,592
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Equity investments carried at fair value | 292 | 291
State and Municipals, Taxable |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 13,017 | 13,544
Available-for-sale, Gross Unrealized Gains | 328 | 309
Available-for-sale, Fair Value | 13,345 | 13,853
State and Municipals, Tax-exempt |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 83,273 | 86,361
Available-for-sale, Gross Unrealized Gains | 471 | 338
Available-for-sale, Gross Unrealized Losses | 169 | 745
Available-for-sale, Fair Value | 83,575 | 85,954
Held-to-maturity, Amortized Cost | 6,855 | 6,855
Held-to-maturity, Gross Unrealized Gains | 119 | 12
Held-to-maturity, Gross Unrealized Losses |  | 43
Held-to-maturity, Fair value | $ 6,974 | $ 6,824

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- Definition The amount the fair value of the equity portfolio exceeded the cost basis. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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