Loans (Schedule of the Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	$ 73,328	$ 75,683
Provision for loan losses	1,500	1,500
Charge-offs	(5,458)	(3,143)
Recoveries	948	1,216
Ending balance	70,318	75,256
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			$ 2,916	$ 6,389	$ 1,912
Loans collectively evaluated for impairment related to allowance for loan losses			67,402	66,939	73,344
Total	73,328	75,683	70,318	73,328	75,256
Loans individually evaluated for impairment related to recorded investment (loan balance)			113,919	121,416	109,104
Loans collectively evaluated for impairment related to recorded investment (loan balance)			5,887,795	5,686,518	4,939,558
Total loans			7,366,885	7,271,147	5,702,874
Commercial Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	47,234	44,156
Provision for loan losses	1,000	3,593
Charge-offs	(3,896)	(1,504)
Recoveries	330	574
Ending balance	44,668	46,819
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			2,736	6,197	1,615
Loans collectively evaluated for impairment related to allowance for loan losses			41,932	41,037	45,204
Total	47,234	44,156	44,668	47,234	46,819
Loans individually evaluated for impairment related to recorded investment (loan balance)			92,916	100,379	89,217
Loans collectively evaluated for impairment related to recorded investment (loan balance)			3,170,986	3,030,342	2,548,223
Total loans			4,308,209	4,250,117	3,081,931
Consumer Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	26,094	28,803
Provision for loan losses	500	(3,227)
Charge-offs	(1,562)	(1,639)
Recoveries	618	642
Ending balance	25,650	24,579
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			180	192	297
Loans collectively evaluated for impairment related to allowance for loan losses			25,470	25,902	24,282
Total	26,094	28,803	25,650	26,094	24,579
Loans individually evaluated for impairment related to recorded investment (loan balance)			21,003	21,037	19,887
Loans collectively evaluated for impairment related to recorded investment (loan balance)			2,716,809	2,656,176	2,391,335
Total loans			3,058,676	3,021,030	2,620,943
Unallocated [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	0	2,724
Provision for loan losses	0	1,134
Charge-offs	0	0
Recoveries	0	0
Ending balance	0	3,858
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			0	0	0
Loans collectively evaluated for impairment related to allowance for loan losses			0	0	3,858
Total	$ 0	$ 2,724	0	0	3,858
Loans individually evaluated for impairment related to recorded investment (loan balance)			0	0	0
Loans collectively evaluated for impairment related to recorded investment (loan balance)			0	0	0
Total loans			0	0	0
Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for loan losses
Financing Receivable, Allowance for Credit Losses			0	0	0
Loans acquired with deteriorated credit quality			1,365,171	1,463,213	654,212
Receivables Acquired with Deteriorated Credit Quality [Member] \| Commercial Loan Portfolio [Member]
Allowance for loan losses
Financing Receivable, Allowance for Credit Losses			0	0	0
Loans acquired with deteriorated credit quality			1,044,307	1,119,396	444,491
Receivables Acquired with Deteriorated Credit Quality [Member] \| Consumer Loan Portfolio [Member]
Allowance for loan losses
Financing Receivable, Allowance for Credit Losses			0	0	0
Loans acquired with deteriorated credit quality			320,864	343,817	209,721
Receivables Acquired with Deteriorated Credit Quality [Member] \| Unallocated [Member]
Allowance for loan losses
Financing Receivable, Allowance for Credit Losses			0	0	0
Loans acquired with deteriorated credit quality			$ 0	$ 0	$ 0

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A valuation allowance for financing receivables that are expected to be uncollectible.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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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 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: 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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02.3)
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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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