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Long-term Debt (Long-term Debt Outstanding by Maturity Date) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt outstanding	$ 13,467	$ 13,581	$ 40,305
Maturing in 2016 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding			$ 26,521
Maturing in 2016 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		0.54%	0.54%
Maturing in 2016 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		1.08%	1.08%
Maturing in 2017 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		$ 1,016	$ 1,016
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		3.03%	3.03%
Maturing In 2019 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		$ 10,000	$ 10,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		1.87%	1.87%
Maturing in 2026 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		$ 2,504	$ 2,703
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		4.80%	4.80%
Maturing in 2027 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding		$ 61	$ 65
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate		6.71%	6.71%

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- Definition

Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: 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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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64702-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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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