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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, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | $ 382,319 | $ 477,813
U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 179,146 | 180,297
U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 2,038 | 16,370
State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 53,987 | 55,358
State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 61,798 | 88,407
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 3,617 | 3,626
Residential mortgage-backed securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 749 | 942
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 80,892 | 132,703
Common equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 92 | 110
Interest rate floor - other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 772 | 1
Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 26,153 | 21,794
Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | (25,366) | (21,466)
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 179,238 | 180,407
Level 1 | U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 179,146 | 180,297
Level 1 | Common equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 92 | 110
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 203,081 | 297,406
Level 2 | U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 2,038 | 16,370
Level 2 | State and Municipals, Taxable |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 53,987 | 55,358
Level 2 | State and Municipals, Tax-exempt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 61,798 | 88,407
Level 2 | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 3,617 | 3,626
Level 2 | Residential mortgage-backed securities, U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 749 | 942
Level 2 | Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 80,892 | 132,703
Level 2 | Interest rate floor - other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 772 | 1
Level 2 | Interest rate swap-other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets measured at fair value | 26,153 | 21,794
Level 2 | Interest rate swap-other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities measured at fair value | $ (25,366) | $ (21,466)

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