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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate $ 659,930 $ 652,883
Credit cards 6,076 6,046
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer 74,187 74,816
Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 654,124 647,283
Credit cards 6,066 6,036
Performing [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer 73,595 73,817
Non-Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Residential real estate 5,806 5,600
Credit cards 10 10
Non-Performing [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Consumer $ 592 $ 999