Regulatory Enforcement Action - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Holding Company Order [Member]
Schedule Of Regulatory Authorities [Line Items]
Termination date	Jul. 02, 2013
Holding Company MOU [Member]
Schedule Of Regulatory Authorities [Line Items]
Termination date	Jan. 08, 2014
Bank Order [Member]
Schedule Of Regulatory Authorities [Line Items]
Termination date	Mar. 30, 2012
Consent Order [Member]
Schedule Of Regulatory Authorities [Line Items]
Termination date	Jan. 31, 2013
Bank MOU [Member]
Schedule Of Regulatory Authorities [Line Items]
Termination date	Nov. 27, 2013