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Fair Value Measurements Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
OREO $ 10,744 $ 9,823
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans 154,305 149,608
OREO 10,744 9,823
MSRs 37,748 37,663
Assets, Fair Value Disclosure $ 202,797 $ 197,094