Fair Value - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average capitalization rate	7.60%
Specific reserve for impaired loans	$ 33,505	$ 32,822	$ 32,423	$ 28,924	$ 28,118	$ 27,122
Additions	1,200
Paydowns and chargeoffs	1,800
Additions to level 3 from foreclosed loans	400
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	7,700		8,600
Specific reserve for impaired loans	2,200		$ 2,700
Reductions related to sale of loans	$ 2,200