Quarterly report pursuant to Section 13 or 15(d)

Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Cash Flows (Detail)

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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2013
As Previously Reported [Member]
Dec. 31, 2013
As Previously Reported [Member]
Jun. 30, 2013
Effect of Change in Accounting Principle [Member]
Cash flows from operating activities:              
Net income $ 11,042 $ 9,487 $ 22,033 $ 19,545 $ 19,629   $ (84)
Total adjustment in net income       10,397 10,313   84
Net cash provided by operating activities     26,383 29,942 29,942    
Cash flows from investing activities:              
Net cash used in investing activities     (82,121) (103,814) (103,814)    
Cash flows from financing activities:              
Net cash used in financing activities     163 (116,315) (116,315)    
Net decrease in cash and cash equivalents     (55,575) (190,187) (190,187)    
Cash and cash equivalents at beginning of year     179,357 268,047 268,047 179,357  
Cash and cash equivalents at end of period $ 123,782 $ 77,860 $ 123,782 $ 77,860 $ 77,860 $ 179,357