Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($) property	Dec. 31, 2016 USD ($) property
Financing Receivable, Allowance for Credit Losses [Line Items]
Deferred fees	$ 509	$ 632	$ 509
Discounts On Acquired Loans		2,000
Loans	871,525	1,047,247	871,525
Allowance period increase due to revised methodology used in calculation	1,100
Allowance period adjusted amoung due to revised methodology used in calculation	(850)
Other real estate owned, net	2,477	1,809	2,477
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	325,768	387,722	325,768
Other real estate owned, net	92	$ 0	$ 92
Number of properties in other real estate owned \| property		2	3
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	6,639	$ 6,483	$ 6,639
Mortgage loans in process of foreclosure, amount	687	620	687
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	22,637	16,076	22,637
Special Mention [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	6,646	5,509	6,646
Special Mention [Member] \| Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans		0
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	22,691	21,410	22,691
Substandard [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	6,880	5,613	6,880
Substandard [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	99		99
Substandard [Member] \| Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 9,000	6,300	$ 9,000
Doubtful [Member] \| Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans		$ 0

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Number of properties in other real estate owned.

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Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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 210.9-03.7(d))
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Amount of increase (decrease) of allowance reserve for credit loss.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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-Name Accounting Standards Codification
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