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Loans and Allowance for Credit Losses - Loan Portfolio by Impairment Methodology (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 899,320	$ 755,361
Ending balance: individually evaluated for impairment	6,366	5,269
Ending balance: collectively evaluated for impairment	892,954	750,092
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	115,812	114,161
Ending balance: individually evaluated for impairment	377	487
Ending balance: collectively evaluated for impairment	115,435	113,674
Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	677,467	550,796
Ending balance: individually evaluated for impairment	4,846	4,238
Ending balance: collectively evaluated for impairment	672,621	546,558
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	106,041	90,404
Ending balance: individually evaluated for impairment	1,143	544
Ending balance: collectively evaluated for impairment	$ 104,898	$ 89,860

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- Definition

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+ References

No definition available.

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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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The balance of financing receivables that were individually 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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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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