Allowance for Loan and Lease Loss and Credit Quality (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
External appraisal, months	12 months
External appraisal considered stale requiring a new appraisal, years	1 year
Financing Receivable Modifications Recorded Investments	$ 66,696,000	$ 73,590,000
Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable Modifications Recorded Investments	54,800,000	68,800,000
Percentage of loan collateral balance, greater than or equal to	100.00%
Available commitments for troubled debt restructurings outstanding	1,000,000	0
Homogeneous [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Duration of time account is past due before risk rating is applied	30 days
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivables modified as troubled debt restructurings within the previous 12 months for which there was a payment default		$ 1,800,000
Minimal Risk [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	1
Low Risk [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	2
Modest Risk [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	3
Average Risk [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	4
Acceptable Risk [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	5
Pass/Watch [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	6
Special Mention [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	7
Special Mention [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	7
Special Mention [Member] | Homogeneous [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	30 days
Special Mention [Member] | Homogeneous [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	59 days
Special Mention [Member] | Homogeneous Retail [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	7
Special Mention [Member] | Homogeneous Retail [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	30 days
Special Mention [Member] | Homogeneous Retail [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	89 days
Substandard [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	8
Substandard [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	8
Substandard [Member] | Homogeneous [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	60 days
Substandard [Member] | Homogeneous [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	89 days
Substandard [Member] | Homogeneous Retail [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	8
Substandard [Member] | Homogeneous Retail [Member] | Open-End Loan [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	90 days
Substandard [Member] | Homogeneous Retail [Member] | Open-End Loan [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	180 days
Substandard [Member] | Homogeneous Retail [Member] | Closed-End Loan [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	90 days
Substandard [Member] | Homogeneous Retail [Member] | Closed-End Loan [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	120 days
Doubtful [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	9
Doubtful [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	9
Doubtful [Member] | Homogeneous [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	90 days
Doubtful [Member] | Homogeneous [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	179 days
Loss [Member] | Non Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	10
Loss [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	10
Loss [Member] | Homogeneous [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	180 days
Loss [Member] | Homogeneous Retail [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	10
Loss [Member] | Homogeneous Retail [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	120 days
Loss [Member] | Homogeneous Retail [Member] | Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	180 days
Loss [Member] | Homogeneous Retail [Member] | Open-End Loan [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	180 days
Loss [Member] | Homogeneous Retail [Member] | Closed-End Loan [Member] | Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Days past due on account for qualifying credit quality indicator	120 days