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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (153) $ (32)
Fair Value, Less Than Twelve Months 46,699 8,900
Gross Unrealized Losses, Twelve Months and Over (284) (1,914)
Fair Value, Twelve Months and Over 50,239 123,852
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1)  
Fair Value, Less Than Twelve Months 5,112  
Gross Unrealized Losses, Twelve Months and Over (80) (440)
Fair Value, Twelve Months and Over 15,337 25,393
U.S. Government Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (63) (1)
Fair Value, Less Than Twelve Months 26,934 5,458
Gross Unrealized Losses, Twelve Months and Over (146) (1,310)
Fair Value, Twelve Months and Over 29,977 82,803
Mortgage-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (5)  
Fair Value, Less Than Twelve Months 5,143  
Gross Unrealized Losses, Twelve Months and Over (32) (62)
Fair Value, Twelve Months and Over 3,732 7,900
State and Local Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (84) (31)
Fair Value, Less Than Twelve Months 9,510 3,442
Gross Unrealized Losses, Twelve Months and Over (26) (102)
Fair Value, Twelve Months and Over $ 1,193 $ 7,756