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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) $ in Thousands | Jun. 30, 2020 USD ($) company | Dec. 31, 2019 USD ($)
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Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | $ 276,418 | $ 328,643
Available-for-sale, Gross Unrealized Gains | 11,302 | 2,988
Available-for-sale, Gross Unrealized Losses | 11 | 1,153
Available-for-sale, Fair Value | 287,709 | 330,478
Held-to-maturity, Amortized Cost | 7,401 | 7,656
Held-to-maturity, Gross Unrealized Gains | 316 | 233
Held-to-maturity, Fair value | 7,717 | 7,889
Equity investments carried at fair value | $ 338 | 423
Number of equity securities portfolio consisting of stock of other financial institutions | company | 2 |
Fair value of equity portfolio in excess of cost basis | $ 61 |
Mortgage-backed Securities, U.S. government agencies |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 5,717 | 8,368
Available-for-sale, Gross Unrealized Gains | 154 | 112
Available-for-sale, Gross Unrealized Losses | 4 | 10
Available-for-sale, Fair Value | 5,867 | 8,470
Held-to-maturity, Amortized Cost | 26 | 31
Held-to-maturity, Fair value | 26 | 31
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 89,787 | 101,914
Available-for-sale, Gross Unrealized Gains | 4,057 | 1,011
Available-for-sale, Gross Unrealized Losses | 7 | 77
Available-for-sale, Fair Value | 93,837 | 102,848
Held-to-maturity, Amortized Cost | 525 | 773
Held-to-maturity, Gross Unrealized Gains | 22 | 25
Held-to-maturity, Fair value | 547 | 798
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 12,657 | 12,694
Available-for-sale, Gross Unrealized Gains | 984 | 171
Available-for-sale, Gross Unrealized Losses |  | 4
Available-for-sale, Fair Value | 13,641 | 12,861
U.S. government-sponsored enterprises state and municipals |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 79,473 | 87,156
Available-for-sale, Gross Unrealized Gains | 1,628 | 181
Available-for-sale, Gross Unrealized Losses |  | 227
Available-for-sale, Fair Value | 81,101 | 87,110
U.S. Treasuries |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 21,473 | 23,966
Available-for-sale, Gross Unrealized Gains | 604 | 162
Available-for-sale, Fair Value | 22,077 | 24,128
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Equity investments carried at fair value | 338 | 423
State and Municipals, Taxable |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 31,694 | 35,418
Available-for-sale, Gross Unrealized Gains | 1,467 | 295
Available-for-sale, Gross Unrealized Losses |  | 815
Available-for-sale, Fair Value | 33,161 | 34,898
State and Municipals, Tax-exempt |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | 35,617 | 59,127
Available-for-sale, Gross Unrealized Gains | 2,408 | 1,056
Available-for-sale, Gross Unrealized Losses |  | 20
Available-for-sale, Fair Value | 38,025 | 60,163
Held-to-maturity, Amortized Cost | 6,850 | 6,852
Held-to-maturity, Gross Unrealized Gains | 294 | 208
Held-to-maturity, Fair value | $ 7,144 | $ 7,060

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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=118939692&loc=d3e27161-111563 + Details
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