Fair Value - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value (Details) [Line Items]
Equity securities, at fair value	$ 40,690	$ 30,806
Minimum
Fair Value (Details) [Line Items]
Appraisal adjustment (percent)	0.00%
Maximum
Fair Value (Details) [Line Items]
Appraisal adjustment (percent)	15.00%
Recurring | Level 2
Fair Value (Details) [Line Items]
Equity securities, at fair value	$ 13,040	11,148
Community Development Investments | Recurring | Level 2
Fair Value (Details) [Line Items]
Equity securities, at fair value		$ 5,000