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Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 227,004	$ 210,515
Interest Rate 0.74% and 0.43% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 103,969	116,272
Maturity date	May 01, 2017
Interest Rate 4.60% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	10,000
Maturity date	Jun. 01, 2017
Interest Rate 4.02% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	5,000
Maturity date	Aug. 07, 2017
Interest Rate 4.10% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	5,000
Maturity date	Aug. 07, 2017
Interest Rate 4.47% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	10,000
Maturity date	Aug. 07, 2017
Interest Rate 0.83% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 15,016	0
Maturity date	Sep. 06, 2017
Interest Rate 3.97% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 0	10,000
Maturity date	Oct. 10, 2017
Interest Rate 1.25% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 15,093	30,000
Maturity date	Dec. 15, 2017
Interest Rate 1.05% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 17,523	0
Maturity date	Sep. 06, 2018
Interest Rate 1.17% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 18,360	0
Maturity date	Sep. 06, 2019
Interest Rate 1.35% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 13,865	18,781
Maturity date	Sep. 16, 2019
Interest Rate 1.27% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 18,780	0
Maturity date	Sep. 08, 2020
Interest Rate 1.47% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 19,201	0
Maturity date	Sep. 06, 2022
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	$ 1,925	2,049
Maturity date	Sep. 05, 2023
Interest Rate 3.05% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 852	888
Maturity date	Mar. 11, 2024
Interest Rate 5.24% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 462	488
Maturity date	Jun. 11, 2024
Interest Rate 3.35% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 240	261
Maturity date	May 04, 2026
Interest Rate 4.00% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 252	273
Maturity date	Oct. 14, 2026
Interest Rate 2.96% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 766	$ 803
Maturity date	Feb. 11, 2033

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Borrowings Under Repurchase Agreements [Line items]

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Federal home loan bank advances general debt obligations disclosures maturity date.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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