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, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,184 $ 986 $ 1,366
Provision (income) 112 198 (380)
Balance at end of period $ 1,296 $ 1,184 $ 986