Variable Interest Entities (Details) - USD ($) $ in Thousands	1 Months Ended		6 Months Ended
	Jun. 30, 2007	Dec. 31, 2005	Jun. 30, 2018
Variable Interest Entity [Line Items]
Carrying amount of investments			$ 132
Trust Preferred Security Offering, 2005
Variable Interest Entity [Line Items]
Payments to acquire trust preferred securities		$ 9,000
Subordinated debt		9,279
Proceeds from issuance of trust preferred securities		9,005
Equity investment		$ 279
Trust Preferred Security Offering, 2007
Variable Interest Entity [Line Items]
Payments to acquire trust preferred securities	$ 3,000
Proceeds from issuance of trust preferred securities	2,995
Equity investment	93
Trust Preferred Security Offering, 2007 | Unsecured Debt
Variable Interest Entity [Line Items]
Subordinated debt	$ 3,093
Maximum
Variable Interest Entity [Line Items]
Limited partnership, percent owned			1.00%