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 Income (Detail)

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Accounting for Investments in Qualified Affordable Housing Projects - Summary of Change in Accounting Principle on Statements of Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest and dividend income $ 34,149 $ 31,627 $ 96,552 $ 91,401
Interest expense 3,475 3,153 9,929 10,169
Net interest income 30,674 28,474 86,623 81,232
Noninterest income 14,321 6,059 25,237 19,945
Noninterest expense 26,763 17,636 63,595 53,898
Income before provision for income taxes 18,232 16,897 55,431 47,279
Provision for income taxes 4,968 6,582 19,667 17,510
Income from continuing operations 13,264 10,315 35,764 29,769
Earnings per share from continuing operations        
Basic $ 0.42 $ 0.33 $ 1.13 $ 0.94
Diluted $ 0.41 $ 0.33 $ 1.12 $ 0.94
As Previously Reported [Member]
        
Interest and dividend income   31,627   91,401
Interest expense   3,153   10,169
Net interest income   28,474   81,232
Noninterest income   6,059   19,945
Noninterest expense   17,811   54,451
Income before provision for income taxes   16,722   46,726
Provision for income taxes   6,542   17,008
Income from continuing operations   10,180   29,718
Earnings per share from continuing operations        
Basic   $ 0.32   $ 0.94
Diluted   $ 0.32   $ 0.94
Effect of Change in Accounting Principle [Member]
        
Noninterest expense   (175)   (553)
Income before provision for income taxes   175   553
Provision for income taxes   40   502
Income from continuing operations   $ 135   $ 51
Earnings per share from continuing operations        
Basic   $ 0.01    
Diluted   $ 0.01