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Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 325,357 $ 354,890
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 8,990 $ 16,654