Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Accounting for Investments in Qualified Affordable Housing Projects - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2012
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
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   $ 20,100,000     20,100,000   21,300,000
Unfunded commitments on low income housing   8,500,000     8,500,000   $ 11,900,000
Income tax expense   586,000 $ 276,000   1,200,000 447,000  
Tax credit and other benefit received from tax expenses   $ 832,000 $ 423,000   $ 1,600,000 $ 665,000