Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ 25	$ 201
Gross Unrealized Losses, Less Than 12 Months	236	761
Fair Value, Less Than 12 Months	10,254	68,677
Gross Unrealized Losses, 12 Months Or More	61	67
Fair Value, 12 Months Or More	6,724	6,061
Gross Unrealized Losses, Total	297	828
Fair Value, Total	16,978	74,738
U.S. Treasury Security [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months		2
Fair Value, Less Than 12 Months		1,000
Gross Unrealized Losses, Total		2
Fair Value, Total		1,000
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months		46
Held-to-maturity, Fair Value, Less Than 12 Months		5,954
Held-to-maturity, Gross Unrealized Losses, Total		46
Held-to-maturity, Fair Value, Total		5,954
Gross Unrealized Losses, Less Than 12 Months		67
Fair Value, Less Than 12 Months		9,172
Gross Unrealized Losses, 12 Months Or More	1	59
Fair Value, 12 Months Or More	1,999	4,941
Gross Unrealized Losses, Total	1	126
Fair Value, Total	1,999	14,113
Mortgage-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months		155
Held-to-maturity, Fair Value, Less Than 12 Months		12,994
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	25
Held-to-maturity, Fair Value, 12 Months Or More	4,260
Held-to-maturity, Gross Unrealized Losses, Total	25	155
Held-to-maturity, Fair Value, Total	4,260	12,994
Gross Unrealized Losses, Less Than 12 Months	43	278
Fair Value, Less Than 12 Months	5,054	20,231
Gross Unrealized Losses, Total	43	278
Fair Value, Total	5,054	20,231
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months		33
Fair Value, Less Than 12 Months		2,652
Gross Unrealized Losses, 12 Months Or More		8
Fair Value, 12 Months Or More		1,120
Gross Unrealized Losses, Total		41
Fair Value, Total		3,772
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months	91	108
Fair Value, Less Than 12 Months	3,915	15,282
Gross Unrealized Losses, 12 Months Or More	35
Fair Value, 12 Months Or More	465
Gross Unrealized Losses, Total	126	108
Fair Value, Total	4,380	15,282
Asset-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months	102	72
Fair Value, Less Than 12 Months	1,285	1,392
Gross Unrealized Losses, Total	102	72
Fair Value, Total	$ 1,285	$ 1,392