Fair Value - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 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	$ 32,822	$ 32,423	$ 28,118	$ 27,122
Additions	1,200
Paydowns and chargeoffs	1,300
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	8,300	8,600
Specific reserve for impaired loans	2,400	$ 2,700
Reductions related to sale of loans	$ 1,300