Loans and Leases (Details Textual)	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($) agreement		Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)		Jun. 30, 2016 USD ($)	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			$ 0
Loan receivable held-for-sale, charge-offs	7,198,000		$ 0	7,198,000		$ 0
Unfunded commitments, loans held-for-sale	19,300,000			19,300,000
Nonaccrual loans and leases	172,576,000	[1]		172,576,000	[1]		170,599,000
Receivable, 90 or more days past due	22,900,000			22,900,000			15,900,000
Receivable, 30-89 days past due	3,200,000			3,200,000			3,000,000
Financing receivable, nonaccrual status, current	146,500,000			146,500,000			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	172,576,000	[2]		172,576,000	[2]		170,599,000
Receivable, 90 or more days past due	22,893,000	[3]		22,893,000	[3]		15,945,000
Receivable, 30-89 days past due	30,384,000	[3]		30,384,000	[3]		$ 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	141,300,000			$ 141,300,000
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	$ 46,500,000			$ 46,500,000

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

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

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