Loans and Leases (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) agreement	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of agreements to sell loans | agreement	2
Loans held for sale, at lower of cost or fair value	$ 175,158,000	$ 175,158,000
Loan receivable held-for-sale, charge-offs		7,200,000
Unfunded commitments, loans held-for-sale	19,300,000	19,300,000
Nonaccrual loans and leases	157,697,000	157,697,000		$ 170,599,000
Receivable, 90 or more days past due	8,800,000	8,800,000		15,900,000
Receivable, 30-89 days past due	700,000	700,000		3,000,000
Financing receivable, nonaccrual status, current	148,200,000	148,200,000		151,700,000
Charge-offs	0		$ 0
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	157,697,000	157,697,000		170,599,000
Receivable, 90 or more days past due	8,798,000	8,798,000		15,945,000
Receivable, 30-89 days past due	5,535,000	5,535,000		$ 31,569,000
Non Purchased Credit Impaired Loans and Leases | Non Purchased Credit Impaired Loans and Leases | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	129,100,000	$ 129,100,000
Percentage of nonaccrual loans and leases		81.90%
Healthcare Real Estate Loan | Non Purchased Credit Impaired Loans and Leases | Non Purchased Credit Impaired Loans and Leases | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 45,500,000	$ 45,500,000