Loans (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	$ (18,800,000)	$ (6,300,000)	$ (18,800,000)	$ (6,300,000)	$ 330,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(5,939,000)	(7,847,000)	(18,359,000)	(28,438,000)
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	$ 53,400,000	$ 44,800,000	$ 53,400,000	$ 44,800,000	$ 46,900,000