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Fair Value - Assets and Liabilities Measured at Fair Value and Related Hierarchy Levels (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets: |  |
Total investment securities | $ 30,167 | $ 24,406
Level 1 |  |
Financial Assets: |  |
Executive deferred compensation plan trust | 7,563 | 6,398
Level 2 | Interest rate swaps |  |
Financial Assets: |  |
Derivative asset | 4,563 | 17,994
Liabilities |  |
Interest rate swaps | 20,638 | 0
Money Market Funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 209 | 71,228
Municipal bonds | Level 2 |  |
Financial Assets: |  |
Total investment securities | 338 | 404
Asset-backed securities | Level 2 |  |
Financial Assets: |  |
Total investment securities | 264 | 279
Mortgage-backed securities | Level 2 |  |
Financial Assets: |  |
Total investment securities | 179 | 260
Fixed-income mutual fund | Level 1 |  |
Financial Assets: |  |
Total investment securities | $ 29,386 | $ 23,463

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