Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 210,515	$ 101,695
Interest Rate 2.09% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	20,000
Maturity date	Sep. 07, 2015
Interest Rate 0.43% and 0.27% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 116,272	35,980
Maturity date	May 02, 2016
Interest Rate 4.6% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 10,000	10,000
Maturity date	Jun. 01, 2017
Interest Rate 4.02% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 5,000	5,000
Maturity date	Aug. 07, 2017
Interest Rate 4.10% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 5,000	5,000
Maturity date	Aug. 07, 2017
Interest Rate 4.47% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 10,000	10,000
Maturity date	Aug. 07, 2017
Interest Rate 3.97% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 10,000	10,000
Maturity date	Oct. 10, 2017
Interest Rate 1.25% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 30,000	0
Maturity date	Dec. 15, 2017
Interest Rate 1.35% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 18,781	0
Maturity date	Sep. 16, 2019
Interest Rate 4.72% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 700	700
Maturity date	Jul. 03, 2023
Interest Rate 4.31%[Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 2,049	2,167
Maturity date	Sep. 05, 2023
Interest Rate 3.05% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 888	924
Maturity date	Mar. 11, 2024
Interest Rate 5.24% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 488	513
Maturity date	Jun. 11, 2024
Interest Rate 3.35% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 261	282
Maturity date	May 04, 2026
Interest Rate 4.00% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 273	292
Maturity date	Oct. 14, 2026
Interest Rate 2.96% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 803	$ 837
Maturity date	Feb. 11, 2033