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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | $ 275,108 | $ 272,470
U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 25,230 | 19,814
U.S. Government-sponsored enterprises state and municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 91,772 | 93,648
State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 13,813 | 15,047
State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 89,969 | 103,833
Mortgage-backed Securities, U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 13,585 | 14,434
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 40,425 | 25,726
Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 291 | 46
Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 864 | 655
Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (841) | (733)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 25,521 | 19,860
Level 1 | U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 25,230 | 19,814
Level 1 | Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 291 | 46
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 249,587 | 252,610
Level 2 | U.S. Government-sponsored enterprises state and municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 91,772 | 93,648
Level 2 | State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 13,813 | 15,047
Level 2 | State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 89,969 | 103,833
Level 2 | Mortgage-backed Securities, U.S. Government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 13,585 | 14,434
Level 2 | Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 40,425 | 25,726
Level 2 | Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 864 | 655
Level 2 | Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | $ (841) | $ (733)

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