Allowance for Loan and Lease Loss and Credit Quality (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) risk_code	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) risk_code	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan and lease losses, subsequent deterioration of purchased impaired loans | $	$ 279,000	$ 242,000	$ 1,900,000	$ 1,300,000
Allowance for loan and lease losses, purchased impaired loans, period increase (decrease) | $	2,200,000	311,000	2,400,000	1,600,000
Deferred loan fees | $	42,800,000	20,200,000	42,800,000	20,200,000	$ 26,300,000
Impaired loans | $	46,955,000		46,955,000		66,696,000
Financing receivables modified as troubled debt restructurings within the previous 12 months for which there was a payment default | $	434,000	$ 0	$ 434,000	$ 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
Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired loans | $	$ 35,700,000		$ 35,700,000		54,800,000
Percentage of loan collateral balance			100.00%
Available commitments for troubled debt restructurings outstanding | $			$ 0		$ 1,000,000
Minimal Risk [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	1		1
Low Risk [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	2		2
Modest Risk [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	3		3
Average Risk [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	4		4
Acceptable Risk [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	5		5
Pass/Watch [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	6		6
Special Mention [Member] | Non-Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	7		7
Special Mention [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	7		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		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		8
Substandard [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	8		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		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		9
Doubtful [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	9		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		10
Loss [Member] | Homogeneous [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Internal risk rating code	10		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		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