Loans - Additional information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans
Real estate-construction loans, percentage	4.40%	3.50%
Loan balances net of unearned income	$ 396	$ 322

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Name:	us-gaap_LoansAndLeasesReceivableDeferredIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant