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Fair Value Measurements - (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value Measurements (Textual) [Abstract]          
Impaired loans not covered under loss-share agreements $ 7,221   $ 7,221   $ 13,349
Specific reserve included in allowance for loan losses 736   736   $ 989
Changes in fair value, gain (loss)     (178) $ 75  
Impairment losses on mortgage servicing rights $ 0 $ 0 $ 0 $ 0