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Loans - Schedule of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2015	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 8,928	$ 8,928
Post-Modification Outstanding Recorded Investment	8,986	8,986
Recorded Investment at Period End	7,759		$ 7,820
Total nonaccruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	648	648
Post-Modification Outstanding Recorded Investment	648	648
Recorded Investment at Period End	362		377
Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	8,280	8,280
Post-Modification Outstanding Recorded Investment	8,338	8,338
Recorded Investment at Period End	7,397		7,443
Commercial real estate | Total nonaccruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	648	648
Post-Modification Outstanding Recorded Investment	648	648
Recorded Investment at Period End	362		377
Commercial real estate | Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	7,944	7,944
Post-Modification Outstanding Recorded Investment	8,002	8,002
Recorded Investment at Period End	7,128		7,171
Residential mortgage | Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	336	336
Post-Modification Outstanding Recorded Investment	336	$ 336
Recorded Investment at Period End	$ 269		$ 272

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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