Loans - Aging of Past Due Loans by Class of Loans - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Aging of Past Due Loans by Class of Loans
Past due loans 30 day or greater	$ 6,095	$ 7,989
Nonaccrual loans	5,200	3,059	$ 4,184
30 days or greater past due
Aging of Past Due Loans by Class of Loans
Nonaccrual loans	1,977	2,057
Less than 30 days past due
Aging of Past Due Loans by Class of Loans
Nonaccrual loans	$ 3,223	$ 1,002

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