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Fair Value Measurements - Mortgage Servicing Rights - Summary (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Available for sale debt securities, fair value | $ 181,270 | $ 218,205
Mortgage servicing rights, fair value | 2,575 | 2,931
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Available for sale debt securities, fair value | 995 | 1,952
Mortgage servicing rights, fair value | 0 | 0
Assets, Total | 63,239 | 62,456
Other Observable Inputs (Level 2) |  |
Assets: |  |
Available for sale debt securities, fair value | 180,275 | 216,253
Mortgage servicing rights, fair value | 0 | 0
Assets, Total | 188,857 | 224,458
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Mortgage servicing rights, fair value | 2,575 | 2,931
Assets, Total | 1,135,410 | 1,117,934
Recurring |  |
Assets: |  |
Assets, Total | 183,858 | 221,148
Recurring | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 995 | 1,952
Recurring | U.S. government and federal agency obligations |  |
Assets: |  |
Available for sale debt securities, fair value | 8,465 | 9,966
Recurring | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 22,798 | 43,335
Recurring | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 29,424 | 40,386
Recurring | Mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 115,234 | 118,192
Recurring | Other debt securities |  |
Assets: |  |
Available for sale debt securities, fair value | 3,051 | 3,000
Recurring | Bank issued trust preferred securities |  |
Assets: |  |
Available for sale debt securities, fair value | 1,303 | 1,374
Recurring | Equity securities |  |
Assets: |  |
Available for sale debt securities, fair value | 13 | 12
Recurring | Mortgage servicing rights (MSRs) |  |
Assets: |  |
Mortgage servicing rights, fair value | 2,575 | 2,931
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Assets, Total | 1,008 | 1,964
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 995 | 1,952
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency obligations |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other debt securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Bank issued trust preferred securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets: |  |
Available for sale debt securities, fair value | 13 | 12
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights (MSRs) |  |
Assets: |  |
Mortgage servicing rights, fair value | 0 | 0
Recurring | Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets, Total | 180,275 | 216,253
Recurring | Other Observable Inputs (Level 2) | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Other Observable Inputs (Level 2) | U.S. government and federal agency obligations |  |
Assets: |  |
Available for sale debt securities, fair value | 8,465 | 9,966
Recurring | Other Observable Inputs (Level 2) | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 22,798 | 43,335
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 29,424 | 40,386
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 115,234 | 118,192
Recurring | Other Observable Inputs (Level 2) | Other debt securities |  |
Assets: |  |
Available for sale debt securities, fair value | 3,051 | 3,000
Recurring | Other Observable Inputs (Level 2) | Bank issued trust preferred securities |  |
Assets: |  |
Available for sale debt securities, fair value | 1,303 | 1,374
Recurring | Other Observable Inputs (Level 2) | Equity securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Other Observable Inputs (Level 2) | Mortgage servicing rights (MSRs) |  |
Assets: |  |
Mortgage servicing rights, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets, Total | 2,575 | 2,931
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency obligations |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Other debt securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Bank issued trust preferred securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Equity securities |  |
Assets: |  |
Available for sale debt securities, fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights (MSRs) |  |
Assets: |  |
Mortgage servicing rights, fair value | $ 2,575 | $ 2,931

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