Quarterly report pursuant to Section 13 or 15(d)

Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Balance Sheets (Detail)

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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Assets        
Cash and cash equivalents $ 197,016 $ 179,357 $ 193,854 $ 268,047
Available-for-Sale, Estimated Fair Value 1,128,624 530,926    
Loans receivable 2,628,091 2,177,498    
Income tax assets 72,330 63,841    
Other assets   102,757    
Total assets 4,228,332 3,054,379    
Liabilities and Stockholders' Equity        
Liabilities 3,793,138 2,654,302    
Stockholders' equity 435,194 400,077 388,725 378,364
Total liabilities and stockholders' equity 4,228,332 3,054,379    
As Previously Reported [Member]
        
Assets        
Cash and cash equivalents   179,357 193,854 268,047
Available-for-Sale, Estimated Fair Value   530,926    
Loans receivable   2,177,498    
Income tax assets   63,536    
Other assets   104,222    
Total assets   3,055,539    
Liabilities and Stockholders' Equity        
Liabilities   2,654,302    
Stockholders' equity   401,237    
Total liabilities and stockholders' equity   3,055,539    
Effect of Change in Accounting Principle [Member]
        
Assets        
Income tax assets   305    
Other assets   (1,465)    
Total assets   (1,160)    
Liabilities and Stockholders' Equity        
Stockholders' equity   (1,160)    
Total liabilities and stockholders' equity   $ (1,160)