Loans and Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 777,717	$ 755,361
Ending balance: individually evaluated for impairment	5,628	5,269
Ending balance: collectively evaluated for impairment	772,089	750,092
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	108,585	114,161
Ending balance: individually evaluated for impairment	394	487
Ending balance: collectively evaluated for impairment	108,191	113,674
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	579,715	550,796
Ending balance: individually evaluated for impairment	5,035	4,238
Ending balance: collectively evaluated for impairment	574,680	546,558
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	89,417	90,404
Ending balance: individually evaluated for impairment	199	544
Ending balance: collectively evaluated for impairment	$ 89,218	$ 89,860

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.

No definition available.

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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