Other Noninterest Expense - Additional Information (Details)	12 Months Ended
Dec. 31, 2018 USD ($)
Other Expense Disclosure Nonoperating [Abstract]
Increase (Decrease) in Deferred Compensation	$ 806,000

The increase (decrease) during the reporting period in the obligation created by employee agreements whereby earned compensation will be paid in the future.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_IncreaseDecreaseInDeferredCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration