Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Jan. 01, 2012
Accounting Changes and Error Corrections [Abstract]              
Cumulative effect of retrospective application of accounting principle             $ 1,100,000
Decrease in net income     $ 44,000        
Impairment of investments       $ 0 $ 0 $ 0  
Investment in low income housing $ 19,500,000     19,500,000   21,300,000  
Unfunded commitments on low income housing 7,800,000     7,800,000   $ 11,900,000  
Income tax expense 592,000 $ 592,000   1,700,000 1,000,000    
Tax credit and other benefit received from tax expenses $ 839,000 $ 821,000   $ 2,500,000 $ 1,400,000