Fair Value - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 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	$ 33,605	$ 33,505	$ 32,423	$ 33,865	$ 28,924	$ 27,122
Additions to level 3 from foreclosed loans	4,600
Paydowns and chargeoffs	1,500
Additions	2,700
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of impaired loans	4,600		8,600
Specific reserve for impaired loans	1,600		$ 2,700
Additions to level 3 from foreclosed loans	5,500
Reductions related to sale of loans	4,300
Writedowns	$ 400