Condensed Financial Statements of Parent Company - Condensed Financial Statements of Parent Company (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 106,405	$ 86,036
Other assets	8,785	8,094
Total assets	1,366,826	1,179,520
LIABILITIES AND SHAREHOLDERS’ EQUITY
Shareholders’ equity	143,366	140,576	$ 129,787	$ 91,480
Total liabilities and shareholders' equity	1,366,826	1,179,520
Parent Company
ASSETS
Investment in bank subsidiary	140,311	138,304
Cash and cash equivalents	3,468	2,219
Other assets	34	141
Total assets	143,813	140,664
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable and other liabilities	447	88
Shareholders’ equity	143,366	140,576
Total liabilities and shareholders' equity	$ 143,813	$ 140,664