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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Losses recognized in earnings for trust preferred securities held        
Beginning balance     $ 140 $ 351
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized          
Ending balance 140 351 140 351
Trust preferred securities
       
Losses recognized in earnings for trust preferred securities held        
Beginning balance 140 351 2,305 351
Reduction for debt securities for which other-than-temporary impairment has been previously recognized and there is no related other comprehensive income            
Credit losses on debt securities for which other-than-temporary impairment has not been previously recognized            
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized            
Sale of debt securities     (2,165)  
Credit losses on debt securities for which other-than-temporary            
Ending balance $ 140 $ 351 $ 140 $ 351