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Investment Securities - Summary Information Regarding Investment Securities Classified as Available for Sale and Held to Maturity (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Amortized Cost $ 202,076,000 $ 183,712,000
Available for sale, Gross Unrealized Gains 1,309,000 1,377,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year 748,000 1,025,000
Available for sale, Gross Unrealized Losses, Over 1 Year 441,000 334,000
Total available for sale, Fair Value 202,196,322 183,729,857
Held to maturity, Amortized Cost 13,117,994 13,365,479
Held to maturity, Gross Unrealized Gains 144,000 69,000
Held to maturity, Gross Unrealized Losses, Less Than 1 Year 16,000 72,000
Held to maturity, Gross Unrealized Losses, Over 1 Year 0 0
Total held to maturity, Fair Value 13,246,498 13,362,062
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Amortized Cost 18,202,000 21,212,000
Available for sale, Gross Unrealized Gains 292,000 260,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year 1,000 44,000
Total available for sale, Fair Value 18,493,000 21,428,000
Held to maturity, Amortized Cost 13,118,000 13,365,000
Held to maturity, Gross Unrealized Gains 144,000 69,000
Held to maturity, Gross Unrealized Losses, Less Than 1 Year 16,000 72,000
Held to maturity, Gross Unrealized Losses, Over 1 Year 0 0
Total held to maturity, Fair Value 13,246,000 13,362,000
U.S. Agency Mortgage-Backed [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Amortized Cost 74,699,000 78,361,000
Available for sale, Gross Unrealized Gains 835,000 938,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year 223,000 368,000
Available for sale, Gross Unrealized Losses, Over 1 Year 57,000  
Total available for sale, Fair Value 75,254,000 78,931,000
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Amortized Cost 100,666,000 75,193,000
Available for sale, Gross Unrealized Gains 108,000 84,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year 517,000 613,000
Available for sale, Gross Unrealized Losses, Over 1 Year 384,000 334,000
Total available for sale, Fair Value 99,873,000 74,330,000
U.S. Government Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale, Amortized Cost 8,509,000 8,946,000
Available for sale, Gross Unrealized Gains 74,000 95,000
Available for sale, Gross Unrealized Losses, Less Than 1 Year 7,000  
Total available for sale, Fair Value $ 8,576,000 $ 9,041,000