Fair Values of Financial Instruments - Financial Instruments Not Disclosed Elsewhere (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Amount
Financial assets:
Loans, net	$ 990,239	$ 625,513
Financial liabilities:
Interest-bearing deposits	745,150	429,450
FHLB advances, notes payable, and financing leases	106,270	56,989
Estimated Fair Value
Financial assets:
Loans, net	976,636	604,290
Financial liabilities:
Interest-bearing deposits	747,211	393,813
FHLB advances, notes payable, and financing leases	109,260	56,979
Estimated Fair Value | Level 2
Financial liabilities:
Interest-bearing deposits	747,211	393,813
FHLB advances, notes payable, and financing leases	109,260	56,979
Estimated Fair Value | Level 3
Financial assets:
Loans, net	$ 976,636	$ 604,290