Business Combinations - Fair value of identifiable assets acquired and liabilities assumed (Details) $ in Thousands	May 01, 2020 USD ($)
Fidelity
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Fair value of equity	$ 11,377
Assets acquired:
Cash and due from financial institutions	26,867
Interest-bearing time deposits	462
Loans receivable, net	55,949
Premises and equipment	747
Regulatory stock	334
Deferred income taxes	564
Other real estate owned	100
Core deposit intangible	65
Accrued interest receivable	209
Other assets	272
Total assets	85,569
Liabilities assumed:
Deposits	(66,409)
Advances from Federal Home Loan Bank	(5,688)
Accrued interest payable	(5)
Other liabilities	(1,477)
Total liabilities	(73,579)
Net assets acquired	11,990
Gain on bargain purchase	(613)
Washington
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Fair value of equity	9,165
Assets acquired:
Cash and due from financial institutions	21,981
Securities available for sale	1,996
Interest-bearing time deposits	100
Loans receivable, net	121,520
Premises and equipment	6,356
Regulatory stock	1,214
Deferred income taxes	2,154
Bank-owned life insurance	3,208
Core deposit intangible	197
Accrued interest receivable	413
Other assets	146
Total assets	159,285
Liabilities assumed:
Deposits	(135,546)
Advances from Federal Home Loan Bank	(11,281)
Accrued interest payable	(145)
Other liabilities	(3,015)
Total liabilities	(149,987)
Net assets acquired	9,298
Gain on bargain purchase	$ (133)