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Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit $ 5,619 $ 5,026 $ 10,088 $ 10,465
Net income 12,195 11,942 22,335 23,762
Unrealized gains (losses) on AFS securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Securities losses (51) (8) (111) (8)
Tax benefit (18) (3) (39) (3)
Net income $ (33) $ (5) $ (72) $ (5)