Loans - Summary of activity in allowance for loan losses by class (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Beginning balance	$ 5,629	$ 4,264	$ 3,413
Provision (credit) for loan losses	1,850	1,375	905
Recoveries			0
Loans charged-off	(490)	(10)	(54)
Total ending allowance balance	6,989	5,629	4,264
Real Estate \| 1 - 4 Family Residential
Allowance for loan losses:
Beginning balance	407	382	360
Provision (credit) for loan losses	(63)	25	22
Recoveries			0
Loans charged-off			0
Total ending allowance balance	344	407	382
Real Estate \| Multifamily
Allowance for loan losses:
Beginning balance	952	713	621
Provision (credit) for loan losses	159	239	92
Recoveries			0
Loans charged-off	(63)		0
Total ending allowance balance	1,048	952	713
Real Estate \| Commercial Real Estate
Allowance for loan losses:
Beginning balance	357	266	238
Provision (credit) for loan losses	203	91	28
Recoveries			0
Loans charged-off			0
Total ending allowance balance	560	357	266
Real Estate \| Construction
Allowance for loan losses:
Beginning balance	149	127	141
Provision (credit) for loan losses	12	22	(14)
Recoveries			0
Loans charged-off			0
Total ending allowance balance	161	149	127
Commercial
Allowance for loan losses:
Beginning balance	3,110	2,272	1,934
Provision (credit) for loan losses	957	838	352
Recoveries			0
Loans charged-off	(19)		(14)
Total ending allowance balance	4,048	3,110	2,272
Consumer
Allowance for loan losses:
Beginning balance	654	504	119
Provision (credit) for loan losses	582	160	425
Recoveries			0
Loans charged-off	(408)	(10)	(40)
Total ending allowance balance	$ 828	$ 654	$ 504

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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