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Investment Securities - Carrying Amounts and Fair Values of Securities Available for Sale and Held to Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost $ 103,361 $ 107,895
Available-for-sale Securities, Gross Unrealized Gains 161 152
Available-for-sale Securities, Gross Unrealized Losses 1,313 2,148
Available-for-sale Securities, Fair Value 102,209 105,899
Held-to-maturity Securities, Amortized Cost 11,780 11,990
Held-to-maturity Securities, Gross Unrealized Gains 109 21
Held-to-maturity Securities, Gross Unrealized Losses 26 77
Held-to-maturity Securities, Fair Value 11,863 11,934
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 4,012 4,017
Available-for-sale Securities, Gross Unrealized Losses 9 3
Available-for-sale Securities, Fair Value 4,003 4,014
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 57,441 58,506
Available-for-sale Securities, Gross Unrealized Gains 23 28
Available-for-sale Securities, Gross Unrealized Losses 580 863
Available-for-sale Securities, Fair Value 56,884 57,671
Held-to-maturity Securities, Amortized Cost 1,607 1,754
Held-to-maturity Securities, Gross Unrealized Gains 8  
Held-to-maturity Securities, Gross Unrealized Losses   17
Held-to-maturity Securities, Fair Value 1,615 1,737
GSE - Mortgage-backed Securities and CMO's [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 23,592 26,195
Available-for-sale Securities, Gross Unrealized Gains 43 39
Available-for-sale Securities, Gross Unrealized Losses 319 586
Available-for-sale Securities, Fair Value 23,316 25,648
State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 13,268 14,123
Available-for-sale Securities, Gross Unrealized Gains 55 71
Available-for-sale Securities, Gross Unrealized Losses 397 658
Available-for-sale Securities, Fair Value 12,926 13,536
Held-to-maturity Securities, Amortized Cost 6,949 6,974
Held-to-maturity Securities, Gross Unrealized Gains 63 7
Held-to-maturity Securities, Gross Unrealized Losses 26 60
Held-to-maturity Securities, Fair Value 6,986 6,921
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 5,048 5,054
Available-for-sale Securities, Gross Unrealized Gains 40 14
Available-for-sale Securities, Gross Unrealized Losses 8 38
Available-for-sale Securities, Fair Value 5,080 5,030
Held-to-maturity Securities, Amortized Cost 3,224 3,262
Held-to-maturity Securities, Gross Unrealized Gains 38 14
Held-to-maturity Securities, Fair Value $ 3,262 $ 3,276