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 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2013
As Previously Reported [Member]
Dec. 31, 2013
As Previously Reported [Member]
Sep. 30, 2013
Effect of Change in Accounting Principle [Member]
Cash flows from operating activities:              
Net income $ 13,264 $ 10,385 $ 35,320 $ 29,930 $ 29,879   $ 51
Total adjustment in net income       18,047 18,098   (51)
Net cash provided by operating activities     24,705 47,977 47,977    
Cash flows from investing activities:              
Net cash used in investing activities     37,704 (71,768) (71,768)    
Cash flows from financing activities:              
Net cash used in financing activities     (44,750) (50,402) (50,402)    
Net decrease in cash and cash equivalents     17,659 (74,193) (74,193)    
Cash and cash equivalents at beginning of year     179,357 268,047 268,047 179,357  
Cash and cash equivalents at end of period $ 197,016 $ 193,854 $ 197,016 $ 193,854 $ 193,854 $ 179,357