Parent Corporation Only Financial Statements (Details) - Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income:
Dividend income from subsidiaries									$ 1,778	$ 2,012	$ 1,421
Other income									871	607
Net Income	$ 20,783	$ 21,696	$ 19,281	$ 11,635	$ 18,672	$ 19,902	$ 17,527	$ 4,251	73,395	60,352	43,220
Parent Company [Member]
Income:
Dividend income from subsidiaries									30,050	16,700	13,000
Other income									1,652	1,618	13
Total Income									31,702	18,318	13,013
Expenses									(7,386)	(7,201)	(3,251)
Income before equity in undistributed earnings of subsidiaries									24,316	11,117	9,762
Equity in undistributed earnings of subsidiaries									49,079	49,235	33,458
Net Income									$ 73,395	$ 60,352	$ 43,220