Fair Value - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.60%
Specific reserve for impaired loans	$ 32,423	$ 27,122	$ 23,400	$ 19,128
Additions to level 3	9,400
Reductions to level 3	3,800
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	8,600	4,200
Specific reserve for impaired loans	2,700	$ 2,400
Additions to level 3	300
Other real estate owned and other reductions classified as level 3 transfers in	8,400
Reductions	$ 5,900