Annual report pursuant to Section 13 and 15(d)

Junior Subordinated Debentures - Schedule of Outstanding Subordinated Debentures (Parenthetical) (Detail)

v2.4.0.6
Junior Subordinated Debentures - Schedule of Outstanding Subordinated Debentures (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Subordinate Debenture [Line Items]  
Junior subordinated debt includes the funding cost $ 69,000
Junior subordinated debentures [Member]
 
Subordinate Debenture [Line Items]  
Debt redemption period 5 years