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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Quarterly Financial Data [Line Items]                      
Interest and Dividend Income $ 30,139 $ 29,402 $ 29,965 $ 30,294 $ 30,640 $ 31,674 $ 32,618 $ 33,875 $ 119,800 $ 128,807 $ 144,512
Interest Expense 3,708 4,483 4,793 5,761 6,206 6,515 7,143 7,766 18,745 27,630 38,638
Net Interest Income Before Provision for Credit Losses 26,431 24,919 25,172 24,533 24,434 25,159 25,475 26,109 101,055 101,177 105,874
Provision for Credit Losses     4,000 2,000 4,000 8,100     6,000 12,100 122,496
Non-Interest Income 7,470 6,520 7,189 3,633 6,348 5,978 6,017 5,508 24,812 23,851 25,406
Non-Interest Expense 19,548 18,804 19,763 18,746 21,249 18,852 22,886 21,061 76,861 84,048 96,805
INCOME (LOSS) BEFORE (BENEFIT) PROVISION FOR INCOME TAXES 14,353 12,635 8,598 7,420 5,533 4,185 8,606 10,556 43,006 28,880 (88,021)
Provision (Benefit) for Income Taxes 374 (644) (47,177) 79 27 (18) 605 119 (47,368) 733 (12)
NET INCOME $ 13,979 $ 13,279 $ 55,775 $ 7,341 $ 5,506 $ 4,203 $ 8,001 $ 10,437 $ 90,374 $ 28,147 $ (88,009)
Basic $ 0.44 $ 0.42 $ 1.77 $ 0.23 $ 0.22 $ 0.22 $ 0.42 $ 0.55 $ 2.87 $ 1.38 $ (7.46)
Diluted $ 0.44 $ 0.42 $ 1.77 $ 0.23 $ 0.22 $ 0.22 $ 0.42 $ 0.55 $ 2.87 $ 1.38 $ (7.46)