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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, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost $ 92,454 $ 89,580
Available-for-sale Securities, Gross Unrealized Gains 787 503
Available-for-sale Securities, Gross Unrealized Losses 218 825
Available-for-sale Securities, Fair Value 93,023 89,258
Held-to-maturity Securities, Amortized Cost 12,145 11,242
Held-to-maturity Securities, Gross Unrealized Gains 299 30
Held-to-maturity Securities, Gross Unrealized Losses   30
Held-to-maturity Securities, Fair Value 12,444 11,242
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 5,060 5,435
Available-for-sale Securities, Gross Unrealized Gains 30  
Available-for-sale Securities, Gross Unrealized Losses 56 71
Available-for-sale Securities, Fair Value 5,034 5,364
Held-to-maturity Securities, Amortized Cost 3,300 3,338
Held-to-maturity Securities, Gross Unrealized Gains 63  
Held-to-maturity Securities, Gross Unrealized Losses   20
Held-to-maturity Securities, Fair Value 3,363 3,318
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 4,022 4,026
Available-for-sale Securities, Gross Unrealized Gains 45  
Available-for-sale Securities, Gross Unrealized Losses   14
Available-for-sale Securities, Fair Value 4,067 4,012
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 39,692 36,159
Available-for-sale Securities, Gross Unrealized Gains 296 99
Available-for-sale Securities, Gross Unrealized Losses 67 188
Available-for-sale Securities, Fair Value 39,921 36,070
Held-to-maturity Securities, Amortized Cost 1,848 1,911
Held-to-maturity Securities, Gross Unrealized Gains 18  
Held-to-maturity Securities, Gross Unrealized Losses   5
Held-to-maturity Securities, Fair Value 1,866 1,906
Mortgage-backed Securities and CMO's [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 29,475 30,269
Available-for-sale Securities, Gross Unrealized Gains 271 53
Available-for-sale Securities, Gross Unrealized Losses 95 549
Available-for-sale Securities, Fair Value 29,651 29,773
State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 14,205 13,691
Available-for-sale Securities, Gross Unrealized Gains 145 351
Available-for-sale Securities, Gross Unrealized Losses   3
Available-for-sale Securities, Fair Value 14,350 14,039
Held-to-maturity Securities, Amortized Cost 6,997 5,993
Held-to-maturity Securities, Gross Unrealized Gains 218 30
Held-to-maturity Securities, Gross Unrealized Losses   5
Held-to-maturity Securities, Fair Value $ 7,215 $ 6,018