Finance Receivables and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Beginning balance	$ 32,054	$ 12,990
Charge-offs	820	(2,484)
Payments	(12,398)	(6,674)
Additions	28,391	28,222
Ending balance	48,867	32,054
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	12,660	7,086
Charge-offs	879	(2,230)
Payments	(6,251)	(1,770)
Additions	15,155	9,574
Ending balance	22,443	12,660
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	18,422	5,851
Charge-offs	1	(234)
Payments	(5,635)	(4,849)
Additions	9,851	17,654
Ending balance	22,639	18,422
Consumer Loan [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	473	53
Charge-offs	(61)	(20)
Payments	(455)	(20)
Additions	1,484	460
Ending balance	1,441	473
Residential [Member]
Financing Receivable, Impaired [Line Items]
Beginning balance	499
Charge-offs	1
Payments	(57)	(35)
Additions	1,901	534
Ending balance	$ 2,344	$ 499