Loans and Leases (Details Textual) - USD ($)		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at lower of cost or fair value		$ 1,500,000,000
Loan receivable held-for-sale, charge-offs		0
Nonaccrual loans and leases		103,725,000	$ 155,784,000	[1]
Receivable, 90 or more days past due		12,385,000	14,200,000
Receivable, 30-89 days past due		37,249,000	3,200,000
Financing receivable, nonaccrual status, current			138,400,000
Charge-offs					$ 0
Proceeds from Sale of Loans Held-for-sale		1,000,000,000
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group		0	481,100,000
Gain on sale of loans and leases		4,569,000	1,988,000		$ 712,000
Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases		$ 68,800,000
Percentage of nonaccrual loans and leases		66.30%
Available For Sale Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of loans and leases		$ 1,300,000
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	[2]		155,784,000
Receivable, 90 or more days past due	[3]		14,165,000
Receivable, 30-89 days past due	[3]		$ 48,435,000
Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable, 90 or more days past due		11,900,000
Receivable, 30-89 days past due		8,700,000
Financing receivable, nonaccrual status, current		$ 83,100,000

[1] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[2] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.

[3] Excludes loans held for sale carried at lower of cost or fair value and PCI loans.