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Fair Value Measurement (Fair Value Measurements, Nonrecurring) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Impaired Loan [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 5,917 $ 6,090
Impaired Loan [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 5,917 6,090
Mortgage Servicing Rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 116 126
Mortgage Servicing Rights [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 116 $ 126