Loans and Leases (Details 9) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 132,472
Reserve for Unfunded Loan Commitments, Balance, beginning of period	36,861		$ 28,635
Allowance for Credit Losses, Balance, beginning of period	169,333
Allowance for Loan and Lease Losses, Charge-offs	(3,465)
Reserve for Unfunded Loan Commitments, Charge-offs	0		0
Allowance for Credit Losses, Charge-offs	(3,465)
Allowance for Loan and Lease Loss, Recoveries	3,274
Reserve for Unfunded Loan Commitments, Recoveries	0		0
Allowance for Credit Losses, Recoveries	3,274
Allowance for Loan and Lease Losses, Net charge-offs	(191)
Reserve for Unfunded Loan Commitments, Net charge-offs	0		0
Allowance For Credit Losses, Net charge-offs	(191)
Allowance for Loan and Lease Losses, Provision (negative provision)	4,000
Reserve for Unfunded Commitments, Provision (negative provision)	0		(4,226)
Allowance for Credit Losses, Provision (negative provision)	4,000	$ 12,000	4,000
Balance, end of period	136,281	132,472
Reserve for Unfunded Loan Commitments, Balance, end of period	36,861	36,861	32,861
Allowance for Credit Losses, Balance, end of period	$ 173,142	$ 169,333
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period			139,456
Allowance for Credit Losses, Balance, beginning of period			168,091
Allowance for Loan and Lease Losses, Charge-offs			(12,153)
Allowance for Credit Losses, Charge-offs			(12,153)
Allowance for Loan and Lease Loss, Recoveries			7,198
Allowance for Credit Losses, Recoveries			7,198
Allowance for Loan and Lease Losses, Net charge-offs			(4,955)
Allowance For Credit Losses, Net charge-offs			(4,955)
Allowance for Loan and Lease Losses, Provision (negative provision)			(226)
Allowance for Credit Losses, Provision (negative provision)			4,000
Balance, end of period			134,275
Allowance for Credit Losses, Balance, end of period			167,136
Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period			$ 6,444