Securities - Summary of Gross Unrealized Losses and Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	$ 16,254	$ 35,941
Unrealized Losses, Less Than 12 Months	73	353
Fair Value, 12 Months or More	2,978	3,019
Unrealized Losses, 12 Months or More	23	41
Total Fair Value	19,232	38,960
Total Unrealized Losses	96	394
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months		7,990
Unrealized Losses, Less Than 12 Months		5
Fair Value, 12 Months or More		0
Unrealized Losses, 12 Months or More		0
Total Fair Value		7,990
Total Unrealized Losses		5
Residential Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	16,254	26,015
Unrealized Losses, Less Than 12 Months	73	333
Fair Value, 12 Months or More	2,978	3,019
Unrealized Losses, 12 Months or More	23	41
Total Fair Value	19,232	29,034
Total Unrealized Losses	$ 96	374
Mutual fund
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months		1,936
Unrealized Losses, Less Than 12 Months		15
Fair Value, 12 Months or More		0
Unrealized Losses, 12 Months or More		0
Total Fair Value		1,936
Total Unrealized Losses		$ 15