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Loans - Summary of loan composition (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 593,815		$ 564,979
Deferred costs and unearned premiums, net	(137)		390
Allowance for loan losses	(10,676)	$ (8,878)	(6,989)	$ (6,433)	$ (6,049)	$ (5,629)
Net loans	583,002		558,380
Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	296,554		257,957
Real Estate \| 1 - 4 Family Residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	50,717		48,140
Allowance for loan losses	(739)	(497)	(344)	(372)	(380)	(407)
Real Estate \| Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	150,111		152,633
Allowance for loan losses	(2,126)	(1,441)	(1,048)	(920)	(949)	(952)
Real Estate \| Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	54,284		52,477
Allowance for loan losses	(982)	(817)	(560)	(406)	(408)	(357)
Real Estate \| Construction
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			6,450
Allowance for loan losses	0		(161)	(161)	(159)	(149)
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	296,554		257,957
Allowance for loan losses	(4,816)	(5,086)	(4,048)	(3,843)	(3,486)	(3,110)
Commercial \| SBA paycheck protection program loans
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	21,900		0
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	42,149		47,322
Allowance for loan losses	$ (2,013)	$ (1,037)	$ (828)	$ (731)	$ (667)	$ (654)