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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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