Fair Value Measurements - Assets measured at fair value on a nonrecurring basis (Details) - Nonrecurring $ in Thousands	Dec. 31, 2018 USD ($)
Assets
Impaired loans	$ 1,602
Other real estate owned	4,224
Level 2
Assets
Other real estate owned	358
Level 3
Assets
Impaired loans	1,602
Other real estate owned	$ 3,866

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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