Loans - Summary of loan composition (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 590,019	$ 564,979
Deferred costs and unearned premiums, net	378	390
Allowance for loan losses	(8,878)	(6,989)	$ (6,049)	$ (5,629)
Net loans	581,519	558,380
Real Estate \| 1 - 4 Family Residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	51,738	48,140
Allowance for loan losses	(497)	(344)	(380)	(407)
Real Estate \| Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	147,333	152,633
Allowance for loan losses	(1,441)	(1,048)	(949)	(952)
Real Estate \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	51,126	52,477
Allowance for loan losses	(817)	(560)	(408)	(357)
Real Estate \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		6,450
Allowance for loan losses		(161)	(159)	(149)
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	292,343	257,957
Allowance for loan losses	(5,086)	(4,048)	(3,486)	(3,110)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	47,479	47,322
Allowance for loan losses	$ (1,037)	$ (828)	$ (667)	$ (654)

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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