Loans - Summary of activity in allowance for loan losses by class (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Allowance for loan losses:
Beginning balance	$ 6,989	$ 5,629
Provision (credit) for loan losses	1,900	425
Recoveries	0	0
Loans charged-off	(11)	(5)
Total ending allowance balance	8,878	6,049
Real Estate \| 1 - 4 Family Residential
Allowance for loan losses:
Beginning balance	344	407
Provision (credit) for loan losses	153	(27)
Recoveries	0	0
Loans charged-off	0	0
Total ending allowance balance	497	380
Real Estate \| Multifamily
Allowance for loan losses:
Beginning balance	1,048	952
Provision (credit) for loan losses	393	(3)
Recoveries	0	0
Loans charged-off	0	0
Total ending allowance balance	1,441	949
Real Estate \| Commercial Real Estate
Allowance for loan losses:
Beginning balance	560	357
Provision (credit) for loan losses	257	51
Recoveries	0	0
Loans charged-off	0	0
Total ending allowance balance	817	408
Real Estate \| Construction
Allowance for loan losses:
Beginning balance	161	149
Provision (credit) for loan losses	(161)	10
Recoveries	0	0
Loans charged-off	0	0
Total ending allowance balance		159
Commercial
Allowance for loan losses:
Beginning balance	4,048	3,110
Provision (credit) for loan losses	1,038	381
Recoveries	0	0
Loans charged-off	0	(5)
Total ending allowance balance	5,086	3,486
Consumer
Allowance for loan losses:
Beginning balance	828	654
Provision (credit) for loan losses	220	13
Recoveries	0	0
Loans charged-off	(11)	0
Total ending allowance balance	$ 1,037	$ 667

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount, after recoveries, of loans and leases that have been written-off.

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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 expense related to estimated loss from loan and lease transactions.

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