Allowance for Loan and Lease Losses (Composition of the Company's allowance for loan and lease losses) (Details) (USD $)
In Thousands, unless otherwise specified

Allowance for Loan and Lease Losses (Composition of the Company's allowance for loan and lease losses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	$ 69,517	$ 54,298
Loans And Leases Receivable Allowance, Covered	64,245	52,729	54,124
Loans And Leases Receivable Allowance Covered and Not Covered	133,762	107,027
Non Covered Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	69,517	54,298
Originated Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	51,439	49,081
Originated Loans [Member] \| Residential Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	19,679	19,937
Originated Loans [Member] \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	8,432	14,897
Originated Loans [Member] \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	9,072	6,006
Originated Loans [Member] \| Auto and Leasing Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	14,255	7,866
Originated Loans [Member] \| Unallocated Financing Receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	1	375
Non-covered acquired loans accounted for under ASC 310-20
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	4,597	2,354
Non-covered acquired loans accounted for under ASC 310-20 \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	65	926
Non-covered acquired loans accounted for under ASC 310-20 \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	1,211	0
Non-covered acquired loans accounted for under ASC 310-20 \| Auto and Leasing Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	3,321	1,428
Accounted for under ASC 310-30 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	13,481	2,863
Accounted for under ASC 310-30 [Member] \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	13,476	1,713
Accounted for under ASC 310-30 [Member] \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	5	418
Accounted for under ASC 310-30 [Member] \| Automobile Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses, non covered	0	732
Acquired Loans In An F D I C Assisted Transaction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans And Leases Receivable Allowance, Covered	64,245	52,729
Acquired Loans In An F D I C Assisted Transaction [Member] \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans And Leases Receivable Allowance, Covered	389	615
Acquired Loans In An F D I C Assisted Transaction [Member] \| Loans Secured by multi-family properties [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans And Leases Receivable Allowance, Covered	15,522	12,495
Acquired Loans In An F D I C Assisted Transaction [Member] \| Commercial and Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans And Leases Receivable Allowance, Covered	$ 48,334	$ 39,619