Allowance for Loan and Lease Loss and Credit Quality (Activity In The Non-Covered Allowance For Loan And Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				$ 95,085				$ 103,666	$ 95,085	$ 103,666
Charge-offs									(30,178)	(35,498)
Recoveries									11,019	16,201
Provision for loan and lease losses	5,241	14,333	14,696	5,971	2,471	1,104	(79)	7,220	40,241	10,716	29,201
Balance, end of period, Allowance	116,167				95,085				116,167	95,085	103,666
Collectively evaluated for impairment, Allowance	106,420				83,853				106,420	83,853
Individually evaluated for impairment, Allowance	1,408				1,797				1,408	1,797
Loans acquired with deteriorated credit quality	8,339				9,435				8,339	9,435
Total, Allowance for non-covered loans and leases	116,167				95,085				116,167	95,085	103,666
Collectively evaluated for impairment, Non-covered loans and leases	14,662,309				7,268,671				14,662,309	7,268,671
Individually evaluated for impairment, Non-covered loans and leases	102,572				100,783				102,572	100,783
Loans acquired with deteriorated credit quality	562,851				358,712				562,851	358,712
Total, Non-covered loans and leases	15,327,732				7,728,166				15,327,732	7,728,166
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				59,538				67,038	59,538	67,038
Charge-offs									(8,030)	(9,748)
Recoveries									2,539	4,436
Provision for loan and lease losses									1,137	(2,188)
Balance, end of period, Allowance	55,184				59,538				55,184	59,538
Collectively evaluated for impairment, Allowance	49,243				51,758				49,243	51,758
Individually evaluated for impairment, Allowance	1,088				1,785				1,088	1,785
Loans acquired with deteriorated credit quality	4,853				5,995				4,853	5,995
Total, Allowance for non-covered loans and leases	55,184				59,538				55,184	59,538
Collectively evaluated for impairment, Non-covered loans and leases	8,374,716				4,236,643				8,374,716	4,236,643
Individually evaluated for impairment, Non-covered loans and leases	69,636				89,280				69,636	89,280
Loans acquired with deteriorated credit quality	459,308				304,232				459,308	304,232
Total, Non-covered loans and leases	8,903,660				4,630,155				8,903,660	4,630,155
Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				27,028				27,905	27,028	27,905
Charge-offs									(16,824)	(20,810)
Recoveries									6,744	10,445
Provision for loan and lease losses									24,268	9,488
Balance, end of period, Allowance	41,216				27,028				41,216	27,028
Collectively evaluated for impairment, Allowance	38,201				24,303				38,201	24,303
Individually evaluated for impairment, Allowance	320				12				320	12
Loans acquired with deteriorated credit quality	2,695				2,713				2,695	2,713
Total, Allowance for non-covered loans and leases	41,216				27,028				41,216	27,028
Collectively evaluated for impairment, Non-covered loans and leases	2,884,388				2,114,929				2,884,388	2,114,929
Individually evaluated for impairment, Non-covered loans and leases	32,936				11,503				32,936	11,503
Loans acquired with deteriorated credit quality	31,499				15,781				31,499	15,781
Total, Non-covered loans and leases	2,948,823				2,142,213				2,948,823	2,142,213
Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				7,487				7,729	7,487	7,729
Charge-offs									(1,855)	(3,655)
Recoveries									462	569
Provision for loan and lease losses									9,828	2,844
Balance, end of period, Allowance	15,922				7,487				15,922	7,487
Collectively evaluated for impairment, Allowance	15,858				6,878				15,858	6,878
Individually evaluated for impairment, Allowance	0				0				0	0
Loans acquired with deteriorated credit quality	64				609				64	609
Total, Allowance for non-covered loans and leases	15,922				7,487				15,922	7,487
Collectively evaluated for impairment, Non-covered loans and leases	3,084,633				866,463				3,084,633	866,463
Individually evaluated for impairment, Non-covered loans and leases	0				0				0	0
Loans acquired with deteriorated credit quality	1,580				36,960				1,580	36,960
Total, Non-covered loans and leases	3,086,213				903,423				3,086,213	903,423
Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				1,032				994	1,032	994
Charge-offs									(3,469)	(1,285)
Recoveries									1,274	751
Provision for loan and lease losses									5,008	572
Balance, end of period, Allowance	3,845				1,032				3,845	1,032
Collectively evaluated for impairment, Allowance	3,118				914				3,118	914
Individually evaluated for impairment, Allowance	0				0				0	0
Loans acquired with deteriorated credit quality	727				118				727	118
Total, Allowance for non-covered loans and leases	3,845				1,032				3,845	1,032
Collectively evaluated for impairment, Non-covered loans and leases	318,572				50,636				318,572	50,636
Individually evaluated for impairment, Non-covered loans and leases	0				0				0	0
Loans acquired with deteriorated credit quality	70,464				1,739				70,464	1,739
Total, Non-covered loans and leases	$ 389,036				$ 52,375				$ 389,036	$ 52,375