Loans - (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) numberOfLoans	Jun. 30, 2019 USD ($) numberOfLoans	Jun. 30, 2020 USD ($) numberOfLoans	Jun. 30, 2019 USD ($) numberOfLoans	Dec. 31, 2019 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Loan originations	$ 1,113,977,000		$ 1,113,977,000		$ 968,814,000
Outstanding balance of high risk loans, minimum	250,000		250,000		250,000
Interest income on impaired loans	104,000	$ 274,000	154,000	$ 477,000
Unfunded commitments to lend	$ 0		$ 0
Loan contracts restructured	0	0	0	0
Number of loans that subsequently defaulted | numberOfLoans	0	0	0	0
Loans	$ 1,113,977,000		$ 1,113,977,000		968,814,000
Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loan originations	988,714,000		988,714,000		847,100,000
Loans	988,714,000		988,714,000		$ 847,100,000
Loans Receivable | Legacy Loans
Loans and Leases Receivable Disclosure [Line Items]
Loan originations	137,800,000		137,800,000
Loans	137,800,000		137,800,000
Loan Modifications, CARES Act
Loans and Leases Receivable Disclosure [Line Items]
Loan originations	113,200,000		113,200,000
Loans	$ 113,200,000		$ 113,200,000