Loans and Credit Quality Loans and Credit Quality (Details 8) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	27		6	57	19
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 62,106		$ 1,400	$ 77,173	$ 12,284
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 62,080		$ 1,400	$ 76,780	$ 12,284
Real Estate Mortgage Other Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	10		4	24	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,476		$ 1,341
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 2,450		$ 1,341
Commercial Real Estate Construction Loan Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2		0	3	2
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 7,004		$ 0	$ 9,614	$ 4,920
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 7,004		$ 0	$ 9,614	4,920
Collateralized Loan Obligations [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	6		2	12
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,309		$ 59		$ 3,346
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,309		$ 59	$ 4,708
Unsecured Commercial Member [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2		0	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 112		$ 0	$ 306
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 112		$ 0	$ 306
Cash Flow [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2		0	4	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0		$ 0	$ 566	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0		$ 0	387	$ 0
Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	5	[1]	0		0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 49,205	[1]	$ 0	53,338	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 49,205	[1]	$ 0	$ 53,338	$ 0
SBA Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts				1	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 0	$ 0
Consumer Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts				1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 91	$ 124
Financing Receivable, Modifications, Post-Modification Recorded Investment				91	$ 124
Unsecured Commercial Member [Member] | NonCovered [Member] | Unsecured Commercial Member [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts					2
Financing Receivable, Modifications, Pre-Modification Recorded Investment					$ 38
Financing Receivable, Modifications, Post-Modification Recorded Investment					$ 38
Collateralized Loan Obligations [Member] | NonCovered [Member] | Collateralized Loan Obligations [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts					6
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 4,708
Financing Receivable, Modifications, Post-Modification Recorded Investment					$ 3,346
Equipment Finance Commercial Financing Receivable [Member] | NonCovered [Member] | Equipment Finance Commercial Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts				9
Real Estate Mortgage Other Receivable [Member] | NonCovered [Member] | Real Estate Mortgage Other Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 8,550	3,856
Financing Receivable, Modifications, Post-Modification Recorded Investment				$ 8,336	$ 3,856

[1] (1)During the second quarter of 2015, two loan relationships, consisting of five loans and leases adversely affected by low oil prices, were restructured to reduce the current payment amounts for a period of time. These loans were assessed for impairment during the first quarter of 2015 and a specific credit loss allowance was established. These loans were on nonaccrual status before and after the restructuring.