Nature of Operations and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Customer Lists
Intangible assets
Amortization period		21 months
Core Deposits
Intangible assets
Amortization period	10 years
Minimum | Licenses and Trade Names
Intangible assets
Amortization period	84 months
Maximum | Licenses and Trade Names
Intangible assets
Amortization period	120 months