Fair Value of Financial Instruments and Fair Value Measurements - Measured on a Nonrecurring Basis (Details) $ in Thousands	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreclosed assets, net	$ 965	$ 3,706
Nonrecurring | Collateral dependent impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Collateral dependent impaired loans	8,798	6,749
Nonrecurring | Collateral dependent impaired loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Collateral dependent impaired loans	$ 8,798	6,749
Nonrecurring | Collateral dependent impaired loans | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0
Nonrecurring | Collateral dependent impaired loans | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.90
Nonrecurring | Collateral dependent impaired loans | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.31
Nonrecurring | Foreclosed assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreclosed assets, net	$ 965	3,706
Nonrecurring | Foreclosed assets, net | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreclosed assets, net	$ 965	$ 3,706
Nonrecurring | Foreclosed assets, net | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.08
Nonrecurring | Foreclosed assets, net | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.47
Nonrecurring | Foreclosed assets, net | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Measurement input	0.27