Condensed Financial Statements of Parent Company - Condensed Financial Statements of Parent Company (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 86,036	$ 77,726
Other assets	8,094	7,935
Total assets	1,179,520	1,044,186
LIABILITIES AND SHAREHOLDERS’ EQUITY
Shareholders’ equity	140,576	129,787	$ 91,480	$ 81,284
Total liabilities and shareholders' equity	1,179,520	1,044,186
Parent Company
ASSETS
Investment in bank subsidiary	138,304	129,732
Cash and cash equivalents	2,219
Other assets	141	55
Total assets	140,664	129,787
LIABILITIES AND SHAREHOLDERS’ EQUITY
Accounts payable and other liabilities	88
Shareholders’ equity	140,576	129,787
Total liabilities and shareholders' equity	$ 140,664	$ 129,787