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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Interest and dividend income $ 31,176 $ 30,379 $ 62,403 $ 59,774
Interest expense 3,183 3,225 6,453 7,016
Net interest income 27,993 27,154 55,950 52,758
Non-interest income 5,073 6,738 10,901 13,887
Non-interest expense 18,557 18,607 36,830 36,263
Income before provision for income taxes 18,375 15,285 37,187 30,382
Provision for income taxes 6,866 5,958 14,710 10,926
Income from continuing operations 11,509 9,327 22,477 19,456
Earnings per share from continuing operations        
Basic $ 0.36 $ 0.30 $ 0.71 $ 0.62
Diluted $ 0.36 $ 0.29 $ 0.70 $ 0.62
As Previously Reported [Member]
        
Interest and dividend income   30,379   59,774
Interest expense   3,225   7,016
Net interest income   27,154   52,758
Non-interest income   6,738   13,887
Non-interest expense   18,796   36,640
Income before provision for income taxes   15,096   30,005
Provision for income taxes   5,737   10,465
Income from continuing operations   9,359   19,540
Earnings per share from continuing operations        
Basic   $ 0.30   $ 0.62
Diluted   $ 0.29   $ 0.62
Effect of Change in Accounting Principle [Member]
        
Non-interest expense   (189)   (377)
Income before provision for income taxes   189   377
Provision for income taxes   221   461
Income from continuing operations   $ (32)   $ (84)