Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Uninsured accounts	$ 6,700,000
Premises and equipment depreciation method used	straight-line
Held-to-maturity securities	$ 0
Minimum [Member]
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 [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Premises and equipment estimated useful lives	50 years
Intangible assets amortization period	11 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	$ 2,900,000