Loans and Leases (Details 8) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period		$ 157,238		$ 157,238
Reserve for Unfunded Loan Commitments, Balance, beginning of period	$ 17,763	17,523	$ 17,569	17,523	$ 16,734
Allowance for Credit Losses, Balance, beginning of period	179,070	174,761	147,930	174,761	131,845
Reserve for Unfunded Loan Commitments, Charge-offs	0		0	0	0
Allowance for Credit Losses, Charge-offs	(26,410)		(1,880)	(49,568)	(7,416)
Reserve for Unfunded Loan Commitments, Recoveries	0		0	0	0
Allowance for Credit Losses, Recoveries	2,062		1,280	4,801	2,761
Reserve for Unfunded Loan Commitments, Net charge-offs	0		0	0	0
Allowance For Credit Losses, Net charge-offs	(24,348)		(600)	(44,767)	(4,655)
Reserve for Unfunded Commitments, Provision (negative provision)	2,500		375	2,740	1,210
Allowance for Credit Losses, Provision (negative provision)	11,499	24,728	13,903	36,227	34,043
Balance, end of period	145,958			145,958
Reserve for Unfunded Loan Commitments, Balance, end of period	20,263	17,763	17,944	20,263	17,944
Allowance for Credit Losses, Balance, end of period	166,221	179,070	161,233	166,221	161,233
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	149,826	143,755	120,807	143,755	105,534
Allowance for Credit Losses, Balance, beginning of period	167,589	161,278	138,376	161,278	122,268
Allowance for Loan and Lease Losses, Charge-offs	22,951		1,712	43,879	7,085
Allowance for Credit Losses, Charge-offs	(22,951)		(1,712)	(43,879)	(7,085)
Allowance for Loan and Lease Loss, Recoveries	2,004		1,280	4,743	2,761
Allowance for Credit Losses, Recoveries	2,004		1,280	4,743	2,761
Allowance for Loan and Lease Losses, Net charge-offs	(20,947)		(432)	(39,136)	(4,324)
Allowance For Credit Losses, Net charge-offs	(20,947)		(432)	(39,136)	(4,324)
Allowance for Loan and Lease Losses, Provision (negative provision)	10,000		11,625	34,260	30,790
Allowance for Credit Losses, Provision (negative provision)	12,500		12,000	37,000	32,000
Balance, end of period	138,879	149,826	132,000	138,879	132,000
Allowance for Credit Losses, Balance, end of period	159,142	167,589	149,944	159,142	149,944
Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period		13,483		13,483
Balance, beginning of period	11,481	13,483	9,554	13,483	9,577
Allowance for Loan and Lease Losses, Charge-offs	3,459		168	5,689	331
Allowance for Loan and Lease Loss, Recoveries	58		0	58	0
Allowance for Loan and Lease Losses, Net charge-offs	(3,401)		(168)	(5,631)	(331)
Allowance for Loan and Lease Losses, Provision (negative provision)	(1,001)		1,903	(773)	2,043
Balance, end of period	7,079			7,079
Balance, end of period	$ 7,079	$ 11,481	$ 11,289	$ 7,079	$ 11,289