Annual report pursuant to Section 13 and 15(d)

Off-Balance Sheet Commitments - Allowance for Off-Balance Sheet Commitments (Details)

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Off-Balance Sheet Commitments - Allowance for Off-Balance Sheet Commitments (Details) - Allowance for off-balance sheet items [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 986 $ 1,366 $ 1,248
Provision (negative provision) charged to operating expense 198 (380) 118
Balance at end of period $ 1,184 $ 986 $ 1,366