Loans - Major Classification of Loans (Parenthetical) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 750,202,000	$ 781,341,000	$ 657,680,000
Net deferred loan fees	320,000	110,000
Loans Held-For-Sale [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	151,000	35,800,000
Net deferred loan fees	76	146,000
Loans and leases receivable amortized cost	$ 150,000	$ 35,900,000

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