Variable Interest Entities - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Jan. 31, 2014 USD ($)	Mar. 31, 2014 USD ($) Installment	Mar. 31, 2013 USD ($)	Dec. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)
Variable Interest Entity [Line Items]
Imputed interest rate		9.00%
Subordinated Note, maturity date		2026-03
Loss on consolidation of PEAKS Trust		$ 0	$ (73,248,000)
Payments on Behalf of Borrowers		1,832,000	1,855,000
Recoveries from charged-off loans		0	103,000
Advances to 2009 Entity		0	0
Revolving note, amount owned to company		$ 8,200,000	7,600,000	$ 8,200,000
2009 RSA [Member]
Variable Interest Entity [Line Items]
Number of monthly payments | Installment		10
Discount rate		10.00%
Recoveries from charged-off loans		$ 0	103,000
PEAKS Trust [Member]
Variable Interest Entity [Line Items]
Amount of liabilities exceeding fair value assets					$ 112,748,000
Reduction in excess of increase in fair value of liabilities over assets.					$ 39,500,000
Loss on consolidation of PEAKS Trust			73,248,000
Payments on Behalf of Borrowers	$ 1,832,000
PEAKS Trust [Member] | 2014 Payment [Member]
Variable Interest Entity [Line Items]
Prepayment of Senior debt		40,000,000
Nonaffiliated Entity [Member]
Variable Interest Entity [Line Items]
Recoveries from charged-off loans		$ 219,000	54,000
Amount offset against 2009 Entity under the Revolving Note			538,000
Nonaffiliated Entity [Member] | 2009 RSA [Member]
Variable Interest Entity [Line Items]
Amount offset against 2009 Entity under the Revolving Note			$ 538,000