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Short-Term Borrowings - Information Concerning Securities Sold under Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Disclosure [Abstract]      
Balance at year end $ 9,032 $ 9,650 $ 15,013
Average balance during the year 13,772 19,072 60,737
Average interest rate during the year 0.20% 0.38% 0.52%
Maximum month-end balance during the year 19,105 33,752 98,906
Securities underlying the agreements at year-end:      
Carrying value 52,936 72,081 76,006
Estimated fair value $ 52,024 $ 72,717 $ 77,485