Business Description - Additional Information (Details)	Sep. 30, 2021 branch office	Jun. 01, 2016
Business Description [Line Items]
Number of full service branches \| branch	9
Number of loan production offices \| office	4
Open Bank
Business Description [Line Items]
Percentage of voting equity interests acquired		100.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant