Loans - Summary of loan composition (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 564,979	$ 467,149	$ 467,149
Deferred costs and unearned premiums, net	390	952
Allowance for loan losses	(6,989)	(5,629)	(4,264)	$ (3,413)
Loans, net	558,380	462,472
Real Estate \| 1 - 4 Family Residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	48,140	56,043
Allowance for loan losses	(344)	(407)	(382)	(360)
Real Estate \| Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	152,633	136,537
Allowance for loan losses	(1,048)	(952)	(713)	(621)
Real Estate \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	52,477	33,145
Allowance for loan losses	(560)	(357)	(266)	(238)
Real Estate \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	6,450	5,921
Allowance for loan losses	(161)	(149)	(127)	(141)
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	257,957	191,828
Allowance for loan losses	(4,048)	(3,110)	(2,272)	(1,934)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	47,322	43,675
Allowance for loan losses	$ (828)	$ (654)	$ (504)	$ (119)

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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