Allowance for Loan and Lease Loss and Credit Quality (Activity In The Allowance For Loan And Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	$ 116,167	$ 95,085
Charge-offs	(12,545)	(6,234)
Recoveries	3,845	2,207
Provision (recapture)	12,637us-gaap_ProvisionForLoanAndLeaseLosses	5,971us-gaap_ProvisionForLoanAndLeaseLosses
Balance, end of period, Allowance	120,104	97,029
Collectively evaluated for impairment, Allowance	110,937	85,814
Individually evaluated for impairment, Allowance	1,400	1,358
Total, Allowance for non-covered loans and leases	120,104	97,029
Collectively evaluated for impairment, Loans and leases	14,933,493	7,323,294
Individually evaluated for impairment, Loans and leases	94,340	105,731
Total loans and leases, net of deferred fees and costs	15,548,957	7,763,691	15,327,732
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	55,184	59,538
Charge-offs	(727)	(2,241)
Recoveries	223	830
Provision (recapture)	502	(209)
Balance, end of period, Allowance	55,182	57,918
Collectively evaluated for impairment, Allowance	49,543	50,613
Individually evaluated for impairment, Allowance	1,081	1,343
Total, Allowance for non-covered loans and leases	55,182	57,918
Collectively evaluated for impairment, Loans and leases	8,475,620	4,223,962
Individually evaluated for impairment, Loans and leases	66,481	91,190
Total loans and leases, net of deferred fees and costs	8,964,979	4,601,659
Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	41,216	27,028
Charge-offs	(4,564)	(3,519)
Recoveries	1,071	1,102
Provision (recapture)	6,477	5,620
Balance, end of period, Allowance	44,200	30,231
Collectively evaluated for impairment, Allowance	41,436	27,000
Individually evaluated for impairment, Allowance	319	15
Total, Allowance for non-covered loans and leases	44,200	30,231
Collectively evaluated for impairment, Loans and leases	2,919,336	2,124,134
Individually evaluated for impairment, Loans and leases	27,859	14,541
Total loans and leases, net of deferred fees and costs	2,975,349	2,149,482
Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	15,922	7,487
Charge-offs	(308)	(250)
Recoveries	31	162
Provision (recapture)	576	424
Balance, end of period, Allowance	16,221	7,823
Collectively evaluated for impairment, Allowance	15,521	7,242
Individually evaluated for impairment, Allowance	0	0
Total, Allowance for non-covered loans and leases	16,221	7,823
Collectively evaluated for impairment, Loans and leases	3,124,655	924,561
Individually evaluated for impairment, Loans and leases	0	0
Total loans and leases, net of deferred fees and costs	3,193,594	960,336
Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	3,845	1,032
Charge-offs	(6,946)	(224)
Recoveries	2,520	113
Provision (recapture)	5,082	136
Balance, end of period, Allowance	4,501	1,057
Collectively evaluated for impairment, Allowance	4,437	959
Individually evaluated for impairment, Allowance	0	0
Total, Allowance for non-covered loans and leases	4,501	1,057
Collectively evaluated for impairment, Loans and leases	413,882	50,637
Individually evaluated for impairment, Loans and leases	0	0
Total loans and leases, net of deferred fees and costs	415,035	52,214	389,036
Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance	7,767	9,857
Loans acquired with deteriorated credit quality, Loans and leases	521,100	334,666	562,900
Receivables Acquired with Deteriorated Credit Quality [Member] \| Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance	4,558	5,962
Loans acquired with deteriorated credit quality, Loans and leases	422,878	286,507
Receivables Acquired with Deteriorated Credit Quality [Member] \| Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance	2,445	3,216
Loans acquired with deteriorated credit quality, Loans and leases	28,154	10,807
Receivables Acquired with Deteriorated Credit Quality [Member] \| Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance	700	581
Loans acquired with deteriorated credit quality, Loans and leases	68,939	35,775
Receivables Acquired with Deteriorated Credit Quality [Member] \| Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance	64	98
Loans acquired with deteriorated credit quality, Loans and leases	$ 1,153	$ 1,577

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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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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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

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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-Number Topic 6

-Section L

-Subsection 1

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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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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Amount of expense related to estimated loss from loan and lease transactions.

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