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Parent Company Only Financial Information - Condensed Statements of Income and Comprehensive Income (Detail) (USD $)
In Thousands, 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
Dividends from:                      
Income Before Income Taxes                 $ 23,019 $ 23,547 $ 20,633
Income tax benefit                 (6,340) (6,411) (5,529)
Net Income 4,728 4,703 2,951 4,297 3,890 4,563 4,336 4,347 16,679 17,136 15,104
Other Comprehensive Income (Loss):                      
Net change in unrealized gains/losses on available for sale securities, net of reclassification and tax                 (23,675) 3,561 14,441
Change in actuarial gain, net of amortization and tax, for post-employment health care plan, net of tax                 (103) (349) (485)
Change in fair value of interest rate swap agreements designated as a cash flow hedge, net of tax                 409 (49) (522)
Total other comprehensive income (loss)                 (23,369) 3,163 13,434
Comprehensive income (loss)                 (6,690) 20,299 28,538
Parent Company [Member]
                      
Dividends from:                      
Bank subsidiary                 1,875 7,990 7,600
Non-bank subsidiaries                 6,674 0 0
Other                 208 208 146
Total income                 8,757 8,198 7,746
Expenses                 (1,461) (1,457) (1,410)
Income Before Income Taxes                 7,296 6,741 6,336
Income tax benefit                 438 438 443
Equity in undistributed net income of bank subsidiary                 14,080 8,682 7,162
Equity in undistributed net income (loss) of non-bank subsidiaries                 (5,135) 1,275 1,163
Net Income                 16,679 17,136 15,104
Other Comprehensive Income (Loss):                      
Net change in unrealized gains/losses on available for sale securities, net of reclassification and tax                 (23,675) 3,561 14,441
Change in actuarial gain, net of amortization and tax, for post-employment health care plan, net of tax                 (103) (349) (485)
Change in fair value of interest rate swap agreements designated as a cash flow hedge, net of tax                 409 (49) (522)
Total other comprehensive income (loss)                 (23,369) 3,163 13,434
Comprehensive income (loss)                 $ (6,690) $ 20,299 $ 28,538