Fair Value Measurements - Schedule of assets measured at fair value on nonrecurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	$ 24,681
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	25,344	$ 15,846
Nonrecurring | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	24,681	15,682
Nonrecurring | Other foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	663	164
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	0	0
Nonrecurring | Level 1 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	0	0
Nonrecurring | Level 1 | Other foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	663	164
Nonrecurring | Level 2 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	0	0
Nonrecurring | Level 2 | Other foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	663	164
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	24,681	15,682
Nonrecurring | Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	24,681	15,682
Nonrecurring | Level 3 | Other foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of assets on nonrecurring basis	$ 0	$ 0