Loans (Schedule of the Allowance for Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	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	1,600	3,000
Charge-offs	(3,472)	(5,474)
Recoveries	1,273	817
Ending balance	78,473	82,834
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	2,065	6,184	1,591
Loans collectively evaluated for impairment related to allowance for loan losses	75,908	76,150	76,981
Loans acquired with deteriorated credit quality related to allowance for loan losses	500	500	500
Total	78,473	82,834
Loans individually evaluated for impairment related to recorded investment (loan balance)	107,531	101,946	107,313
Loans collectively evaluated for impairment related to recorded investment (loan balance)	4,356,934	3,709,043	4,245,611
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	288,824	374,272	294,697
Total loans	4,753,289	4,185,261	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	960	2,437
Charge-offs	(1,209)	(3,516)
Recoveries	777	211
Ending balance	45,010	49,107
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	1,621	5,522	1,081
Loans collectively evaluated for impairment related to allowance for loan losses	43,389	43,585	43,401
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	45,010	49,107
Loans individually evaluated for impairment related to recorded investment (loan balance)	87,587	84,650	89,905
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,252,423	1,892,452	2,178,714
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	246,643	321,403	250,207
Total loans	2,586,653	2,298,505	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	855	871
Charge-offs	(2,263)	(1,958)
Recoveries	496	606
Ending balance	29,233	28,852
Allowance for loan losses
Loans individually evaluated for impairment related to allowance for loan losses	444	662	510
Loans collectively evaluated for impairment related to allowance for loan losses	28,289	27,690	29,135
Loans acquired with deteriorated credit quality related to allowance for loan losses	500	500	500
Total	29,233	28,852
Loans individually evaluated for impairment related to recorded investment (loan balance)	19,944	17,296	17,408
Loans collectively evaluated for impairment related to recorded investment (loan balance)	2,104,511	1,816,591	2,066,897
Loans acquired with deteriorated credit quality related to recorded investment (loan balance)	42,181	52,869	44,490
Total loans	2,166,636	1,886,756	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	(215)	(308)
Charge-offs	0	0
Recoveries	0	0
Ending balance	4,230	4,875
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	4,230	4,875	4,445
Loans acquired with deteriorated credit quality related to allowance for loan losses	0	0	0
Total	4,230	4,875
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 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.

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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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