Loans (Schedule of the Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	$ 79,072	$ 84,491
Provision for loan losses	6,100	11,000
Charge-offs	(14,229)	(21,146)
Recoveries	4,740	4,727
Ending balance	75,683	79,072
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,338	1,591
Loans collectively evaluated for impairment related to allowance for loan losses	73,845	76,981
Allowance for loan losses related to loans acquired with deteriorated credit quality	500	500
Total	75,683	79,072
Loans individually evaluated for impairment related to recorded investment (loan balance)	105,902	107,313
Loans collectively evaluated for impairment related to recorded investment (loan balance)	4,884,165	4,245,611
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	698,163	294,697
Total loans	5,688,230	4,647,621
Commercial Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	44,482	49,975
Provision for loan losses	3,464	3,895
Charge-offs	(6,399)	(12,280)
Recoveries	2,609	2,892
Ending balance	44,156	44,482
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,003	1,081
Loans collectively evaluated for impairment related to allowance for loan losses	43,153	43,401
Allowance for loan losses related to loans acquired with deteriorated credit quality	0	0
Total	44,156	44,482
Loans individually evaluated for impairment related to recorded investment (loan balance)	86,221	89,905
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,517,371	2,178,714
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	480,432	250,207
Total loans	3,084,024	2,518,826
Consumer Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	30,145	29,333
Provision for loan losses	4,357	7,843
Charge-offs	(7,830)	(8,866)
Recoveries	2,131	1,835
Ending balance	28,803	30,145
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	335	510
Loans collectively evaluated for impairment related to allowance for loan losses	27,968	29,135
Allowance for loan losses related to loans acquired with deteriorated credit quality	500	500
Total	28,803	30,145
Loans individually evaluated for impairment related to recorded investment (loan balance)	19,681	17,408
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,366,794	2,066,897
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	217,731	44,490
Total loans	2,604,206	2,128,795
Unallocated [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	4,445	5,183
Provision for loan losses	(1,721)	(738)
Charge-offs	0	0
Recoveries	0	0
Ending balance	2,724	4,445
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	2,724	4,445
Allowance for loan losses related to loans acquired with deteriorated credit quality	0	0
Total	2,724	4,445
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
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	0	0
Total loans	$ 0	$ 0

The balance of financing receivables that were acquired with deteriorated credit quality.

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The valuation allowance for financing receivables acquired with deteriorated credit quality.

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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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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.

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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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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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