Loans and Leases Loans and Leases (Details 8) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 139,456				$ 157,238				$ 139,456	$ 157,238
Reserve for Unfunded Loan Commitments	28,635				17,523				28,635	17,523	$ 16,734
Financing Receivable, Allowance for Credit Losses	168,091				174,761				168,091	174,761	131,845
Reserve for Unfunded Loan Commitments, Charge-offs									0	0
Financing Receivable, Allowance for Credit Losses, Write-downs									80,296	35,954
Financing Receivable, Allowance for Credit Losses, Recovery									11,548	13,141
Reserve for Unfunded Loan Commitments, Recoveries									0	0
Reserve for Unfunded Loan Commitments, Net Charge-offs									0	0
Financing Receivable, Allowance For Credit Losses, Net Charge-offs									(68,748)	(22,813)
Provision for credit losses	6,406	$ 15,119	$ 11,499	$ 24,728	23,215	$ 8,471	$ 13,903	$ (20,140)	57,752	65,729	45,481
Reserve for Unfunded Loan Commitments, Fair Value									4,326
Reserve for Unfunded Commitments, Provision									6,786	789
Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	6,444				13,483				6,444	13,483
Allowance for Loan and Lease Losses, Write-offs									6,154	862
Allowance for Loan and Lease Losses Write-offs, Net									(5,791)	(823)
Allowance for Loan and Lease Loss, Recovery of Bad Debts									363	39
Provision for Loan and Lease Losses									(1,248)	4,729
Loans and Leases Receivable, Allowance, Covered	6,444				13,483				6,444	13,483	9,577
Non Purchased Credit Impaired Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	133,012				143,755				133,012	143,755	105,534
Financing Receivable, Allowance for Credit Losses	$ 161,647				$ 161,278				161,647	161,278	$ 122,268
Allowance for Loan and Lease Losses, Write-offs									74,142	35,092
Financing Receivable, Allowance for Credit Losses, Write-downs									74,142	35,092
Financing Receivable, Allowance for Credit Losses, Recovery									11,185	13,102
Allowance for Loan and Lease Losses Write-offs, Net									(62,957)	(21,990)
Allowance for Loan and Lease Loss, Recovery of Bad Debts									11,185	13,102
Financing Receivable, Allowance For Credit Losses, Net Charge-offs									(62,957)	(21,990)
Provision for Loan and Lease Losses									52,214	60,211
Provision for credit losses									$ 59,000	61,000
Reserve for Unfunded Commitments, Provision										$ 4,326