Allowance for Loan Losses Impaired Financing Receivables (Details) - Originated Loans - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 10,882	$ 6,052	$ 5,950
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	27,389
Impaired Financing Receivable, Recorded Investment	132,234	91,971	93,448
Impaired Financing Receivable, Unpaid Principal Balance	147,477	109,479	110,055
Impaired Financing Receivable, with Related Allowance, Recorded Investment	32,776
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	32,842
Impaired Financing Receivable, Related Allowance	10,882	6,052	5,950
Impaired Financing Receivable, Average Recorded Investment	119,772	94,957	95,108
Credit Card Receivable
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	25	27	16
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	25	27	16
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		322	296
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	767	981	966
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	36	44	32
Impaired Financing Receivable, with Related Allowance, Recorded Investment	691	885	838
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	691	885	838
Residential Portfolio Segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,670	12,576	12,204
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	13,980	15,552	15,119
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,435	1,283
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12,702	13,566	13,121
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11,823	12,720	12,425
Impaired Financing Receivable, with Related Allowance, Recorded Investment	12,646	13,532	13,047
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	12,745	13,641	13,158
Impaired Financing Receivable, Related Allowance	939
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	43,960	8,411	11,451
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	50,531	15,740	18,207
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,399	72
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,992	2,896	326
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	37,203	12,484	14,193
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8,187	2,744	308
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	8,247	2,798	344
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,993	16,576	16,874
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	17,458	22,625	22,696
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,620	2,914
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,679	3,381	4,497
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13,885	17,035	18,027
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,362	6,021	6,426
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,389	6,022	6,440
Construction Loans
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	0	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0	0
Finance Leases Portfolio Segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0
Home equity lines
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	742	2,015	1,723
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,004	2,045	1,754
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		190	207
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,894	5,779	5,944
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	779	2,073	1,792
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,652	5,609	5,656
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,652	5,829	5,875
Total impaired loans with no related allowance
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	69,920	43,504	46,728
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	84,911	59,990	62,376
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	65,349	48,315	50,741
Total impaired loans with a related allowance
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	10,882	6,052	5,950
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	54,423	46,642	44,367
Impaired Financing Receivable, with Related Allowance, Recorded Investment	62,314	48,467	46,720
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	62,566	49,489	47,679
Installment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,530	3,899	4,460
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,913	4,001	4,584
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		1,086	1,178
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		20,039	19,513
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 1,623	3,959	4,272
Impaired Financing Receivable, with Related Allowance, Recorded Investment		19,676	20,445
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		$ 20,314	$ 21,024