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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | $ 271,554 | $ 272,470
U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 25,476 | 19,814
U.S. Government-sponsored enterprises state and municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 92,497 | 93,648
State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 14,908 | 15,047
State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 97,694 | 103,833
Mortgage-backed Securities, U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 13,030 | 14,434
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 27,773 | 25,726
Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 189 | 46
Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 148 | 655
Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (161) | (733)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 25,665 | 19,860
Level 1 | U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 25,476 | 19,814
Level 1 | Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 189 | 46
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 245,889 | 252,610
Level 2 | U.S. Government-sponsored enterprises state and municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 92,497 | 93,648
Level 2 | State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 14,908 | 15,047
Level 2 | State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 97,694 | 103,833
Level 2 | Mortgage-backed Securities, U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 13,030 | 14,434
Level 2 | Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 27,773 | 25,726
Level 2 | Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 148 | 655
Level 2 | Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | $ (161) | $ (733)

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