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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Payment
Sep. 30, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Securities gains (losses) $ (23) $ 0 $ (31) $ 819
Tax (benefit) expense 5,848 4,943 16,313 15,860
Net income 12,653 10,209 36,415 34,310
Significant Accounting Policies details [Line Items]        
Charge off threshold for unsecured commercial loans considered uncollectible     90 days  
Charge off threshold for closed-end consumer loans and uncollectible loans     120 days  
Number of monthly payments before loan charge off     5  
Minimum [Member]
        
Significant Accounting Policies details [Line Items]        
Historical loan loss review period (in quarters)     4  
Other real estate owned frequency of period reviews     12 months  
Maximum [Member]
        
Significant Accounting Policies details [Line Items]        
Historical loan loss review period (in quarters)     8  
Other real estate owned frequency of period reviews     24 months  
Unrealized Gain (Losses ) on AFS Securities [Member]
        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Securities gains (losses) (23) 0 (31) 819
Tax (benefit) expense (8) 0 (11) 287
Net income $ (15) $ 0 $ (20) $ 532