Securities - Summary of Securities with Gross Unrealized Losses and Fair Values (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	$ 77,457	$ 125,279
Gross Unrealized Losses, Less Than 12 Months	369	1,209
Fair Value, 12 Months or Greater	27,123	26,491
Gross Unrealized Losses, 12 Months or Greater	639	943
Fair Value	104,580	151,770
Gross Unrealized Losses	1,008	2,152
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	4,053	8,840
Gross Unrealized Losses, Less Than 12 Months	2	32
Fair Value	4,053	8,840
Gross Unrealized Losses	2	32
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	6,979	11,072
Gross Unrealized Losses, Less Than 12 Months	126	105
Fair Value, 12 Months or Greater	4,002
Gross Unrealized Losses, 12 Months or Greater	62
Fair Value	10,981	11,072
Gross Unrealized Losses	188	105
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	58,996	91,384
Gross Unrealized Losses, Less Than 12 Months	199	1,029
Fair Value, 12 Months or Greater	21,747	23,386
Gross Unrealized Losses, 12 Months or Greater	200	539
Fair Value	80,743	114,770
Gross Unrealized Losses	399	1,568
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less Than 12 Months	7,429	13,983
Gross Unrealized Losses, Less Than 12 Months	42	43
Fair Value, 12 Months or Greater	770	2,498
Gross Unrealized Losses, 12 Months or Greater	42	69
Fair Value	8,199	16,481
Gross Unrealized Losses	84	112
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, 12 Months or Greater	604	607
Gross Unrealized Losses, 12 Months or Greater	335	335
Fair Value	604	607
Gross Unrealized Losses	$ 335	$ 335