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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate $ 566,045 $ 502,317
Consumer 75,126 69,648
Credit cards 5,037 5,233
Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 562,226 499,078
Consumer 74,113 68,603
Credit cards 5,037 5,233
Non-Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 3,819 3,239
Consumer 1,013 1,045
Credit cards $ 0 $ 0