Loans Receivable (Recorded Investment in loans individually evaluated for impairment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Allowance for loan and lease losses, non covered	$ 69,517	$ 54,298
Non-covered originated loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	344,102	124,053
Recorded Investment	330,455	112,639
Allowance for loan and lease losses, non covered	9,809	10,139
Coverage	3.00%	9.00%
Non-covered acquired loans accounted under ASC 310-20
Financing Receivable, Impaired [Line Items]
Unpaid Principal	672	208
Recorded Investment	672	208
Allowance for loan and lease losses, non covered	0	0
Coverage	0.00%	0.00%
Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal	415,826	527,088
Recorded Investment	369,258	503,869
Allowance for loan and lease losses, non covered	13,481	2,863
Coverage	4.00%	1.00%
Commercial impaired loans with specific allowance [Member] \| Non-covered originated loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	6,349	6,600
Recorded Investment	6,226	5,553
Allowance for loan and lease losses, non covered	841	1,431
Coverage	14.00%	26.00%
Residential troubled-debt restructuring impaired loans with specific allowance [Member] \| Non-covered originated loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	99,947	89,539
Recorded Investment	94,185	84,494
Allowance for loan and lease losses, non covered	8,968	8,708
Coverage	10.00%	10.00%
Commercial impaired loans with no specific allowance [Member] \| Non-covered originated loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	237,806	27,914
Recorded Investment	230,044	22,592
Commercial impaired loans with no specific allowance [Member] \| Non-covered acquired loans accounted under ASC 310-20
Financing Receivable, Impaired [Line Items]
Unpaid Principal	672	208
Recorded Investment	672	208
Mortgage impaired non-covered loan pool [Member] \| Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal		5,183
Recorded Investment		4,718
Allowance for loan and lease losses, non covered		57
Coverage		1.00%
Commercial impaired non-covered loan pool [Member] \| Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal	289,228	48,100
Recorded Investment	255,619	40,411
Allowance for loan and lease losses, non covered	5,506	394
Coverage	2.00%	1.00%
Construction impaired non-covered loan pool [Member] \| Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal	90,786	21,526
Recorded Investment	83,751	17,818
Allowance for loan and lease losses, non covered	7,970	1,319
Coverage	10.00%	7.00%
Consumer impaired non-covered loan pool [Member] \| Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal	35,812	73,043
Recorded Investment	29,888	63,606
Allowance for loan and lease losses, non covered	5	361
Coverage	0.00%	1.00%
Auto impaired non-covered loan pool [Member] \| Non-covered acquired loans accounted under ASC 310-30
Financing Receivable, Impaired [Line Items]
Unpaid Principal		379,236
Recorded Investment		377,316
Allowance for loan and lease losses, non covered		$ 732
Coverage		0.00%

The percentage represents the coverage of the allowance for loan and lease losses to loans.

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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