Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Goodwill
Gross Carrying Amount	$ 35,650		$ 36,850
Accumulated Amortization	(18,249)		(18,459)
Total	17,401		18,391
Intangible amortization expense	990	$ 1,051
Identifiable customer intangibles
Goodwill
Gross Carrying Amount	31,857		31,857
Accumulated Amortization	(15,088)		(14,287)
Total	16,769		17,570
Core deposit intangible assets
Goodwill
Gross Carrying Amount	3,793		4,993
Accumulated Amortization	(3,161)		(4,172)
Total	$ 632		$ 821