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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate $ 459,667 $ 459,114
Consumer 62,007 63,491
Credit cards 4,879 5,065
Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 456,536 456,575
Consumer 61,054 62,379
Credit cards 4,840 5,041
Non-Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 3,131 2,539
Consumer 953 1,112
Credit cards $ 39 $ 24