Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Interest Income	$ 47,338	$ 46,911	$ 41,036	$ 41,189	$ 39,596	$ 33,475	$ 31,533	$ 29,145	$ 176,474	$ 133,749	$ 111,030
Net Interest Income	39,415	38,578	33,641	33,591	32,983	28,548	27,469	25,610	145,225	114,610	99,909
Net Income	$ 15,820	$ 13,064	$ 15,271	$ 15,067	$ 10,980	$ 12,639	$ 11,097	$ 11,813	$ 59,222	$ 46,529	$ 40,676
Basic Earnings per Share (in USD per share)	$ 0.59	$ 0.49	$ 0.61	$ 0.60	$ 0.44	$ 0.55	$ 0.48	$ 0.51	$ 2.29	$ 1.99	$ 1.77
Diluted Earnings per Share (in USD per share)	$ 0.59	$ 0.49	$ 0.61	$ 0.60	$ 0.44	$ 0.55	$ 0.48	$ 0.51	$ 2.29	$ 1.99	$ 1.77