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Loans (Narrative) (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]          
Deferred Discounts, Finance Charges and Interest Included in Receivables $ 1,700,000 $ (1,300,000) $ 1,700,000 $ (1,300,000) $ 330,000
Bank acquisitions          
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion 5,184,000 9,617,000 10,688,000 17,387,000  
Premium finance receivables          
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]          
Loans and Leases Receivable, Deferred Income $ 53,700,000 $ 44,800,000 $ 53,700,000 $ 44,800,000 $ 46,900,000