Goodwill and Core Deposit Intangible Assets Goodwill and Core Deposit Intangible Assets (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 94,697,000	$ 94,697,000
Goodwill, Impairment Loss	0	0	$ 0
Goodwill, Impaired, Accumulated Impairment Loss	3,600,000	3,600,000
Amortization of intangible assets	$ 705,000	$ 725,000	$ 1,809,000