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Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 140,434 $ 238,048
Other comprehensive income (loss) before reclassifications 8,388 (18,306)
Amounts reclassified from accumulated other comprehensive income (loss) (6,074) (5,372)
Other comprehensive income (loss), net of tax 2,314 (23,678)
Ending Balance 142,748 214,370
Securities Available For Sale [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 146,672 245,539
Other comprehensive income (loss) before reclassifications 7,951 (19,372)
Amounts reclassified from accumulated other comprehensive income (loss) 0 (3)
Other comprehensive income (loss), net of tax 7,951 (19,375)
Ending Balance 154,623 226,164
Defined Benefit Plans [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (26,131) (49,071)
Other comprehensive income (loss) before reclassifications 437 1,066
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Other comprehensive income (loss), net of tax 437 1,066
Ending Balance (25,694) (48,005)
Derivatives [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 19,893 41,580
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (loss) (6,074) (5,369)
Other comprehensive income (loss), net of tax (6,074) (5,369)
Ending Balance $ 13,819 $ 36,211