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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
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate $ 494,799 $ 459,114
Consumer 67,753 63,491
Credit cards 5,079 5,065
Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 491,645 456,575
Consumer 66,663 62,379
Credit cards 5,034 5,041
Non-Performing [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 3,154 2,539
Consumer 1,090 1,112
Credit cards $ 45 $ 24