Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2015 RiskFactor Segment Component Category
Investment Securities [Abstract]
Number of components into which amount of impairment is split	2
Loans & Leases [Abstract]
Period after which loans are placed on non accrual status, minimum	90 days
Allowance for Credit Losses [Abstract]
Consecutive months of payments	6 months
Number of primary components of overall allowance for credit losses	3
Number of categories into which risk ratings are grouped	5
Number of risk factors on agricultural loans	2
Period Used for Evaluating Residential Real Estate Values	5 years
Income Taxes [Abstract]
Percentage likely of being realized upon settlement with the applicable taxing authority, minimum (in hundredths)	50.00%
Segment Reporting [Abstract]
Number of reportable segments	1
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years