Loans and Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 910,435	$ 899,320
Ending balance: individually evaluated for impairment	7,473	6,366
Ending balance: collectively evaluated for impairment	902,962	892,954
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	112,868	115,812
Ending balance: individually evaluated for impairment	342	377
Ending balance: collectively evaluated for impairment	112,526	115,435
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	693,537	677,467
Ending balance: individually evaluated for impairment	5,768	4,846
Ending balance: collectively evaluated for impairment	687,769	672,621
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	104,030	106,041
Ending balance: individually evaluated for impairment	1,363	1,143
Ending balance: collectively evaluated for impairment	$ 102,667	$ 104,898

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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