Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity, Gross Unrealized Losses, Total	$ 37	$ 201
Gross Unrealized Losses, Less Than 12 Months	405	761
Fair Value, Less Than 12 Months	37,932	68,677
Gross Unrealized Losses, 12 Months Or More	25	67
Fair Value, 12 Months Or More	5,074	6,061
Gross Unrealized Losses, Total	430	828
Fair Value, Total	43,006	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	3	67
Fair Value, Less Than 12 Months	2,998	9,172
Gross Unrealized Losses, 12 Months Or More	3	59
Fair Value, 12 Months Or More	2,996	4,941
Gross Unrealized Losses, Total	6	126
Fair Value, Total	5,994	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	25	155
Held-to-maturity, Fair Value, Less Than 12 Months	6,370	12,994
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More	12
Held-to-maturity, Fair Value, 12 Months Or More	1,066
Held-to-maturity, Gross Unrealized Losses, Total	37	155
Held-to-maturity, Fair Value, Total	7,436	12,994
Gross Unrealized Losses, Less Than 12 Months	141	278
Fair Value, Less Than 12 Months	15,271	20,231
Gross Unrealized Losses, Total	141	278
Fair Value, Total	15,271	20,231
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months	1	33
Fair Value, Less Than 12 Months	330	2,652
Gross Unrealized Losses, 12 Months Or More	10	8
Fair Value, 12 Months Or More	1,012	1,120
Gross Unrealized Losses, Total	11	41
Fair Value, Total	1,342	3,772
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months	150	108
Fair Value, Less Than 12 Months	11,624	15,282
Gross Unrealized Losses, Total	150	108
Fair Value, Total	11,624	15,282
Asset-Backed Securities of Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than 12 Months	85	72
Fair Value, Less Than 12 Months	1,339	1,392
Gross Unrealized Losses, Total	85	72
Fair Value, Total	$ 1,339	$ 1,392