Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Uninsured accounts	$ 6.1
Premises and equipment depreciation method used	straight-line
Minimum
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Premises and equipment estimated useful lives	3 years
Intangible assets amortization period	3 years
Maximum
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Premises and equipment estimated useful lives	40 years
Intangible assets amortization period	15 years
Federal Reserve Bank of Chicago and Federal Home Loan Bank of Indianapolis
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Uninsured accounts	$ 1.6