Loans (Schedule of the Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	$ 75,683	$ 79,072
Provision for loan losses	(6,500)	(6,100)
Charge-offs	(13,501)	(14,229)
Recoveries	4,646	4,740
Ending balance	73,328	75,683
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			$ 6,389	$ 1,338
Loans collectively evaluated for impairment related to allowance for loan losses			66,939	73,845
Total	75,683	79,072	73,328	75,683
Loans individually evaluated for impairment related to recorded investment (loan balance)			121,416	105,902
Loans collectively evaluated for impairment related to recorded investment (loan balance)			5,686,518	4,884,165
Total loans			7,271,147	5,688,230
Commercial Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	44,156	44,482
Provision for loan losses	(7,275)	(3,464)
Charge-offs	(6,385)	(6,399)
Recoveries	2,188	2,609
Ending balance	47,234	44,156
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			6,197	1,003
Loans collectively evaluated for impairment related to allowance for loan losses			41,037	43,153
Total	44,156	44,482	47,234	44,156
Loans individually evaluated for impairment related to recorded investment (loan balance)			100,379	86,221
Loans collectively evaluated for impairment related to recorded investment (loan balance)			3,030,342	2,517,371
Total loans			4,250,117	3,084,024
Consumer Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	28,803	30,145
Provision for loan losses	(1,949)	(4,357)
Charge-offs	(7,116)	(7,830)
Recoveries	2,458	2,131
Ending balance	26,094	28,803
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			192	335
Loans collectively evaluated for impairment related to allowance for loan losses			25,902	27,968
Total	28,803	30,145	26,094	28,803
Loans individually evaluated for impairment related to recorded investment (loan balance)			21,037	19,681
Loans collectively evaluated for impairment related to recorded investment (loan balance)			2,656,176	2,366,794
Total loans			3,021,030	2,604,206
Unallocated [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	2,724	4,445
Provision for loan losses	2,724	1,721
Charge-offs	0	0
Recoveries	0	0
Ending balance	0	2,724
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses			0	0
Loans collectively evaluated for impairment related to allowance for loan losses			0	2,724
Total	$ 2,724	$ 4,445	0	2,724
Loans individually evaluated for impairment related to recorded investment (loan balance)			0	0
Loans collectively evaluated for impairment related to recorded investment (loan balance)			0	0
Total loans			0	0
Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for loan losses
Allowance for loan losses related to loans acquired with deteriorated credit quality			0	500
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)			1,463,213	698,163
Receivables Acquired with Deteriorated Credit Quality [Member] \| Commercial Loan Portfolio [Member]
Allowance for loan losses
Allowance for loan losses related to loans acquired with deteriorated credit quality			0	0
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)			1,119,396	480,432
Receivables Acquired with Deteriorated Credit Quality [Member] \| Consumer Loan Portfolio [Member]
Allowance for loan losses
Allowance for loan losses related to loans acquired with deteriorated credit quality			0	500
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)			343,817	217,731
Receivables Acquired with Deteriorated Credit Quality [Member] \| Unallocated [Member]
Allowance for loan losses
Allowance for loan losses related to loans acquired with deteriorated credit quality			0	0
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)			$ 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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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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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-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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-Name Accounting Standards Codification
-Topic 310
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-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
-Topic 210
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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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