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Fair Value Measurement (Fair Value, by Balance Sheet Grouping) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale investment securities	$ 111,353	$ 133,625	$ 135,721
Held-to-maturity investment securities	71,199	0
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	29,179	45,973	13,284
Interest-bearing time balances with other financial institutions			4,317
Available for sale investment securities	111,353	133,625	135,721
Held-to-maturity investment securities	71,096
Loans held for sale	2,369	1,959
Net loans and leases	854,594	806,741	730,345
Restricted investment in bank stocks	3,985	2,443	4,266
Accrued interest receivable	3,991	3,928	3,813
Mortgage servicing rights	135	144	174
Deposits	987,468	935,373	777,043
Short-term borrowings	21,468		31,596
Long-term debt	13,467	13,581	40,305
Subordinated debt	7,419	7,414	7,500
Accrued interest payable	788	515	390
Commitments to extend credit	0	0
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	29,179	45,973	13,284
Interest-bearing time balances with other financial institutions			4,317
Available for sale investment securities	111,353	133,625	135,721
Held-to-maturity investment securities	71,199
Loans held for sale	2,369	1,959
Net loans and leases	874,192	824,293	738,773
Restricted investment in bank stocks	3,985	2,443	4,266
Accrued interest receivable	3,991	3,928	3,813
Mortgage servicing rights	135	144	174
Deposits	988,200	935,075	777,320
Short-term borrowings	21,468		31,596
Long-term debt	12,149	13,614	39,626
Subordinated debt	7,420	7,534	7,500
Accrued interest payable	788	515	$ 390
Commitments to extend credit	$ 0	$ 0

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- Definition

Accrued Interest Receivable, Fair Value Disclosure

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No definition available.

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- Definition

Fair value portion of accrued expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 10
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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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-Publisher FASB
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-Topic 325
-SubTopic 20
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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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-Publisher FASB
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of other assets.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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-Publisher FASB
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-Paragraph 3
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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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