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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate $ 684,294 $ 652,883
Credit cards 6,080 6,046
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer 76,476 74,816
Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 678,606 647,283
Credit cards 6,068 6,036
Performing [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer 75,734 73,817
Non-Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 5,688 5,600
Credit cards 12 10
Non-Performing [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer $ 742 $ 999