Loans (Schedule of the Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	$ 88,333	$ 89,530
Provision for loan losses	18,500	26,000
Charge-offs	(27,436)	(32,108)
Recoveries	5,094	4,911
Ending balance	84,491	88,333
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	8,108	9,286
Loans collectively evaluated for impairment related to allowance for loan losses	75,883	77,447
Loans acquired with deteriorated credit quality related to allowance for loan losses	500	1,600
Total	84,491	88,333
Loans individually evaluated for impairment related to recorded investment (loan balance)	106,228	105,806
Loans collectively evaluated for impairment related to recorded investment (loan balance)	3,668,912	3,232,696
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	392,595	492,783
Total loans	4,167,735	3,831,285
Commercial Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	55,645	59,443
Provision for loan losses	7,061	14,196
Charge-offs	(15,723)	(20,571)
Recoveries	2,992	2,577
Ending balance	49,975	55,645
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	7,450	8,582
Loans collectively evaluated for impairment related to allowance for loan losses	42,525	45,863
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	1,200
Total	49,975	55,645
Loans individually evaluated for impairment related to recorded investment (loan balance)	87,327	80,794
Loans collectively evaluated for impairment related to recorded investment (loan balance)	1,840,629	1,582,379
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	336,864	422,152
Total loans	2,264,820	2,085,325
Consumer Loan Portfolio [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	29,166	27,338
Provision for loan losses	9,778	11,031
Charge-offs	(11,713)	(11,537)
Recoveries	2,102	2,334
Ending balance	29,333	29,166
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	658	704
Loans collectively evaluated for impairment related to allowance for loan losses	28,175	28,062
Loans acquired with deteriorated credit quality related to allowance for loan losses	500	400
Total	29,333	29,166
Loans individually evaluated for impairment related to recorded investment (loan balance)	18,901	25,012
Loans collectively evaluated for impairment related to recorded investment (loan balance)	1,828,283	1,650,317
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	55,731	70,631
Total loans	1,902,915	1,745,960
Unallocated [Member]
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment
Beginning balance	3,522	2,749
Provision for loan losses	1,661	773
Charge-offs	0	0
Recoveries	0	0
Ending balance	5,183	3,522
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	5,183	3,522
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0
Total	5,183	3,522
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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