Loans (Schedule of the Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	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	1,500	1,600
Charge-offs	(3,143)	(3,472)
Recoveries	1,216	1,273
Ending balance	75,256	78,473
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,912	2,065	1,338
Loans collectively evaluated for impairment related to allowance for loan losses	73,344	75,908	73,845
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	500	500
Total	75,256	78,473
Loans individually evaluated for impairment related to recorded investment (loan balance)	109,104	107,531	105,902
Loans collectively evaluated for impairment related to recorded investment (loan balance)	4,939,558	4,356,934	4,884,165
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	654,212	288,824	698,163
Total loans	5,702,874	4,753,289	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	3,593	960
Charge-offs	(1,504)	(1,209)
Recoveries	574	777
Ending balance	46,819	45,010
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,615	1,621	1,003
Loans collectively evaluated for impairment related to allowance for loan losses	45,204	43,389	43,153
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	46,819	45,010
Loans individually evaluated for impairment related to recorded investment (loan balance)	89,217	87,587	86,221
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,548,223	2,252,423	2,517,371
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	444,491	246,643	480,432
Total loans	3,081,931	2,586,653	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	(3,227)	855
Charge-offs	(1,639)	(2,263)
Recoveries	642	496
Ending balance	24,579	29,233
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	297	444	335
Loans collectively evaluated for impairment related to allowance for loan losses	24,282	28,289	27,968
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	500	500
Total	24,579	29,233
Loans individually evaluated for impairment related to recorded investment (loan balance)	19,887	19,944	19,681
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,391,335	2,104,511	2,366,794
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	209,721	42,181	217,731
Total loans	2,620,943	2,166,636	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	1,134	(215)
Charge-offs	0	0
Recoveries	0	0
Ending balance	3,858	4,230
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	3,858	4,230	2,724
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	3,858	4,230
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
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	0	0	0
Total loans	$ 0	$ 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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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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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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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