Quarterly report pursuant to Section 13 or 15(d)

Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail)

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Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Adjusted Earnings Before Interest Taxes Depreciation And Amortization And Other Non Cash Items [Abstract]            
Cumulative effect of retrospective application of accounting principle $ 1,100,000          
Increased in net income     135,000   51,000  
Impairment of investments       0   0
Investment in low income housing   21,800,000   21,800,000   3,000,000
Unfunded commitments on low income housing   12,600,000   12,600,000   0
Income tax expense   592,000   1,000,000    
Tax credit and other benefit received from tax expenses   $ 821,000   $ 1,400,000