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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 + Details
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- Definition 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 + Details
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