Fair Values of Financial Instruments - Financial Instruments Not Disclosed Elsewhere (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Carrying Amount
Financial assets:
Loans, net	$ 1,012,560	$ 990,239
Financial liabilities:
Interest-bearing deposits	752,498	745,150
FHLB advances, notes payable, and financing leases	98,950	105,021
Estimated Fair Value
Financial assets:
Loans, net	1,005,188	976,636
Financial liabilities:
Interest-bearing deposits	760,730	747,211
FHLB advances, notes payable, and financing leases	103,966	109,260
Estimated Fair Value | Level 2
Financial liabilities:
Interest-bearing deposits	760,730	747,211
FHLB advances, notes payable, and financing leases	103,966	109,260
Estimated Fair Value | Level 3
Financial assets:
Loans, net	$ 1,005,188	$ 976,636