Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Summary of Quarterly Financial Data (Detail)

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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]                      
Interest and dividend income $ 30,927 $ 31,627 $ 30,379 $ 29,395 $ 30,139 $ 29,402 $ 29,965 $ 30,294 $ 122,328 $ 119,800 $ 128,807
Interest expense 3,338 3,153 3,225 3,791 3,708 4,483 4,793 5,761 13,507 18,745 27,630
Net interest income before provision for credit losses 27,589 28,474 27,154 25,604 26,431 24,919 25,172 24,533 108,821 101,055 101,177
Provision for credit losses                   4,000 2,000   6,000 12,100
Non-interest income 7,584 7,326 8,150 8,357 7,470 6,520 7,189 3,633 31,417 24,812 23,851
Non-interest expense 20,150 18,966 19,964 19,167 19,548 18,804 19,763 18,746 78,247 76,861 84,048
Income before provision (benefit) for income taxes 15,023 16,834 15,340 14,794 14,353 12,635 8,598 7,420 61,991 43,006 28,880
Provision (benefit) for income taxes 4,996 6,584 5,821 4,684 374 (644) (47,177) 79 22,085 (47,368) 733
Net income $ 10,027 $ 10,250 $ 9,519 $ 10,110 $ 13,979 $ 13,279 $ 55,775 $ 7,341 $ 39,906 $ 90,374 $ 28,147
Earnings per share:                      
Basic $ 0.32 $ 0.32 $ 0.30 $ 0.32 $ 0.44 $ 0.42 $ 1.77 $ 0.23 $ 1.26 $ 2.87 $ 1.38
Diluted $ 0.31 $ 0.32 $ 0.30 $ 0.32 $ 0.44 $ 0.42 $ 1.77 $ 0.23 $ 1.26 $ 2.87 $ 1.38