Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 30,516
ACL Allocation	32,918	$ 19,789
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	25,155
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,543
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,808
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	10
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,707
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,607
Commercial | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,543
Commercial | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	64
Commercial | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	65
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,744
Leases | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,744
Leases | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	911
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,580
Commercial real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,580
Commercial real estate - Investor | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	92
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	10,846
Commercial real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	10,846
Commercial real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	198
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,883
Construction | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,883
Construction | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	944
Real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	935
Real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	935
Real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,559
Real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,559
Real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	11
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,305
Multifamily | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,305
Multifamily | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	384
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,047
HELOC | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,047
HELOC | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	96
Other 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	10
Other 1 | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	10
Other 1 | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	$ 6