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Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ 141,814 $ 140,434
Other comprehensive income (loss) before reclassifications     (7,784) 33,088
Amounts reclassified from accumulated other comprehensive income (loss)     (114) (18,246)
Other comprehensive income (loss), net of tax $ 51,619 $ (5,192) (7,898) 14,842
Ending Balance 133,916 155,276 133,916 155,276
Securities Available For Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     190,589 146,672
Other comprehensive income (loss) before reclassifications     (11,194) 31,778
Amounts reclassified from accumulated other comprehensive income (loss)     (114) (23)
Other comprehensive income (loss), net of tax     (11,308) 31,755
Ending Balance 179,281 178,427 179,281 178,427
Defined Benefit Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (48,775) (26,131)
Other comprehensive income (loss) before reclassifications     3,410 1,310
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Other comprehensive income (loss), net of tax     3,410 1,310
Ending Balance (45,365) (24,821) (45,365) (24,821)
Derivatives [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     0 19,893
Other comprehensive income (loss) before reclassifications     0 0
Amounts reclassified from accumulated other comprehensive income (loss)     0 (18,223)
Other comprehensive income (loss), net of tax     0 (18,223)
Ending Balance $ 0 $ 1,670 $ 0 $ 1,670