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Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Assets: |  |
Securities available-for-sale | $ 541,248 | $ 541,439
Mortgage servicing rights | 7,357 | 6,944
U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | 3,923 | 3,947
U.S. government agencies |  |
Assets: |  |
Securities available-for-sale |  | 13,061
States and political subdivisions |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Purchases | 22,046 | 16,712
Assets: |  |
Securities available-for-sale | 274,067 | 278,092
Corporate bonds |  |
Assets: |  |
Securities available-for-sale |  | 833
Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 64,429 | 65,939
Asset-backed securities |  |
Assets: |  |
Securities available-for-sale | 109,514 | 112,932
Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 64,289 | 54,421
Level 1 |  |
Assets: |  |
Securities available-for-sale | 3,923 | 3,947
Level 2 |  |
Assets: |  |
Securities available-for-sale | 529,160 | 520,963
Loans held-for-sale | 2,984 | 4,067
Level 2 | Interest rate swap agreements net of swap credit valuation |  |
Liabilities: |  |
Other liabilities | 58 | 1,287
Level 3 |  |
Assets: |  |
Securities available-for-sale | 8,165 | 16,529
Recurring |  |
Assets: |  |
Loans held-for-sale | 2,984 | 4,067
Mortgage servicing rights | 7,357 | 6,944
Total financial assets | 552,420 | 553,415
Liabilities: |  |
Total | 672 | 2,014
Recurring | Interest rate swap agreements net of swap credit valuation |  |
Assets: |  |
Other assets | 672 | 727
Liabilities: |  |
Other liabilities | 672 | 2,014
Recurring | Forward MBS contracts and forward loan contracts |  |
Assets: |  |
Other assets | 159 | 238
Recurring | U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | 3,923 | 3,947
Recurring | U.S. government agencies |  |
Assets: |  |
Securities available-for-sale | 10,951 | 13,061
Recurring | U.S. government agency mortgage-backed |  |
Assets: |  |
Securities available-for-sale | 14,075 | 12,214
Recurring | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 274,067 | 278,092
Recurring | Corporate bonds |  |
Assets: |  |
Securities available-for-sale |  | 833
Recurring | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 64,429 | 65,939
Recurring | Asset-backed securities |  |
Assets: |  |
Securities available-for-sale | 109,514 | 112,932
Recurring | Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 64,289 | 54,421
Recurring | Level 1 |  |
Assets: |  |
Total financial assets | 3,923 | 3,947
Recurring | Level 1 | U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | 3,923 | 3,947
Recurring | Level 2 |  |
Assets: |  |
Loans held-for-sale | 2,984 | 4,067
Total financial assets | 532,975 | 525,995
Liabilities: |  |
Total | 672 | 2,014
Recurring | Level 2 | Interest rate swap agreements net of swap credit valuation |  |
Assets: |  |
Other assets | 672 | 727
Liabilities: |  |
Other liabilities | 672 | 2,014
Recurring | Level 2 | Forward MBS contracts and forward loan contracts |  |
Assets: |  |
Other assets | 159 | 238
Recurring | Level 2 | U.S. government agencies |  |
Assets: |  |
Securities available-for-sale | 10,951 | 13,061
Recurring | Level 2 | U.S. government agency mortgage-backed |  |
Assets: |  |
Securities available-for-sale | 14,075 | 12,214
Recurring | Level 2 | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 265,902 | 263,831
Recurring | Level 2 | Corporate bonds |  |
Assets: |  |
Securities available-for-sale |  | 833
Recurring | Level 2 | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 64,429 | 63,671
Recurring | Level 2 | Asset-backed securities |  |
Assets: |  |
Securities available-for-sale | 109,514 | 112,932
Recurring | Level 2 | Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 64,289 | 54,421
Recurring | Level 3 |  |
Assets: |  |
Mortgage servicing rights | 7,357 | 6,944
Total financial assets | 15,522 | 23,473
Recurring | Level 3 | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | $ 8,165 | 14,261
Recurring | Level 3 | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale |  | $ 2,268

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