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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 | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | $ 333,912 | $ 296,049
U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 18,825 | 18,905
U.S. government-sponsored enterprises state and municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 57,583 | 65,188
State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 56,624 | 55,366
State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 71,760 | 56,994
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 1,489 | 1,000
Mortgage-backed Securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 3,186 | 3,707
Mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 124,286 | 94,751
Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 159 | 138
Loan held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 458 | 837
Interest rate floor - other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 1,455 | 1,678
Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 9,980 | 13,693
Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (9,496) | (14,099)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 18,984 | 19,043
Level 1 | U.S. Treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 18,825 | 18,905
Level 1 | Common equity securities. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 159 | 138
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 314,928 | 277,006
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 | 57,583 | 65,188
Level 2 | State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 56,624 | 55,366
Level 2 | State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 71,760 | 56,994
Level 2 | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 1,489 | 1,000
Level 2 | Mortgage-backed Securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 3,186 | 3,707
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 | 124,286 | 94,751
Level 2 | Loan held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 458 | 837
Level 2 | Interest rate floor - other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 1,455 | 1,678
Level 2 | Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets, Fair Value Estimate | 9,980 | 13,693
Level 2 | Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | $ (9,496) | $ (14,099)

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