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Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements (Off-balance-sheet financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commitments to Extend Credit [Member]    
Off-balance-sheet financial instruments:    
Notional Amount $ 325,357 $ 354,890
Standby Letters of Credit [Member]    
Off-balance-sheet financial instruments:    
Notional Amount $ 8,990 $ 16,654