Loans and Allowance for Loan Losses - Investment in Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	$ 2,632	$ 23
Residential Real Estate
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	162	$ 23
Commercial \| Commercial
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	100
Other \| Commercial Real Estate
Recorded investment in nonaccrual and loans past due over 90 days
Nonaccrual	$ 2,370

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant