Allowance for Loan and Lease Loss and Credit Quality (Activity In The Allowance For Loan And Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				$ 116,167				$ 95,085	$ 116,167	$ 95,085
Charge-offs									(35,571)	(30,178)
Recoveries									13,137	11,019
Provision for loan and lease losses	$ 4,545	$ 8,153	$ 11,254	12,637	$ 5,241	$ 14,333	$ 14,696	5,971	36,589	40,241	$ 10,716
Balance, end of period, Allowance	130,322				116,167				130,322	116,167	95,085
Collectively evaluated for impairment, Allowance												$ 125,664	$ 106,420
Individually evaluated for impairment, Allowance												788	1,408
Loans acquired with deteriorated credit quality												23,265	14,369
Total, Allowance for non-covered loans and leases	130,322			116,167	116,167			95,085	116,167	95,085	95,085	130,322	116,167
Collectively evaluated for impairment, Non-covered loans and leases												16,357,143	14,662,309
Individually evaluated for impairment, Non-covered loans and leases												52,113	102,572
Loans acquired with deteriorated credit quality												705,896	508,745
Total, Non-covered loans and leases												16,847,360	15,327,732
Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality												3,870	8,339
Loans acquired with deteriorated credit quality												438,104	562,851
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				55,184				59,538	55,184	59,538
Charge-offs									(6,194)	(8,030)
Recoveries									2,682	2,539
Provision for loan and lease losses									2,413	1,137
Balance, end of period, Allowance	54,085				55,184				54,085	55,184	59,538
Collectively evaluated for impairment, Allowance												51,085	49,243
Individually evaluated for impairment, Allowance												281	1,088
Total, Allowance for non-covered loans and leases	54,085			55,184	55,184			59,538	55,184	59,538	59,538	54,085	55,184
Collectively evaluated for impairment, Non-covered loans and leases												8,941,213	8,374,716
Individually evaluated for impairment, Non-covered loans and leases												28,119	69,636
Total, Non-covered loans and leases												9,309,035	8,903,660
Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality												2,719	4,853
Loans acquired with deteriorated credit quality												339,703	459,308
Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				41,216				27,028	41,216	27,028
Charge-offs									(15,875)	(16,824)
Recoveries									5,001	6,744
Provision for loan and lease losses									17,353	24,268
Balance, end of period, Allowance	47,695				41,216				47,695	41,216	27,028
Collectively evaluated for impairment, Allowance												46,941	38,201
Individually evaluated for impairment, Allowance												507	320
Total, Allowance for non-covered loans and leases	47,695			41,216	41,216			27,028	41,216	27,028	27,028	47,695	41,216
Collectively evaluated for impairment, Non-covered loans and leases												3,141,682	2,884,388
Individually evaluated for impairment, Non-covered loans and leases												23,994	32,936
Total, Non-covered loans and leases												3,197,246	2,948,823
Commercial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality												247	2,695
Loans acquired with deteriorated credit quality												31,570	31,499
Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				15,922				7,487	15,922	7,487
Charge-offs									(879)	(1,855)
Recoveries									641	462
Provision for loan and lease losses									6,333	9,828
Balance, end of period, Allowance	22,017				15,922				22,017	15,922	7,487
Collectively evaluated for impairment, Allowance												21,215	15,858
Individually evaluated for impairment, Allowance												0	0
Total, Allowance for non-covered loans and leases	22,017			15,922	15,922			7,487	15,922	7,487	7,487	22,017	15,922
Collectively evaluated for impairment, Non-covered loans and leases												3,750,023	3,084,633
Individually evaluated for impairment, Non-covered loans and leases												0	0
Total, Non-covered loans and leases												3,813,890	3,086,213
Residential [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality												802	64
Loans acquired with deteriorated credit quality												63,867	1,580
Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance				3,845				1,032	3,845	1,032
Charge-offs									(12,623)	(3,469)
Recoveries									4,813	1,274
Provision for loan and lease losses									10,490	5,008
Balance, end of period, Allowance	6,525				3,845				6,525	3,845	1,032
Collectively evaluated for impairment, Allowance												6,423	3,118
Individually evaluated for impairment, Allowance												0	0
Total, Allowance for non-covered loans and leases	$ 6,525			$ 3,845	$ 3,845			$ 1,032	$ 3,845	$ 1,032	$ 1,032	6,525	3,845
Collectively evaluated for impairment, Non-covered loans and leases												524,225	318,572
Individually evaluated for impairment, Non-covered loans and leases												0	0
Total, Non-covered loans and leases												527,189	389,036
Consumer & Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality												102	727
Loans acquired with deteriorated credit quality												$ 2,964	$ 70,464