Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($)	Oct. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets acquired:
Goodwill		$ 59,678,000	$ 24,431,000	$ 24,431,000
Liabilities assumed:
Fair value of common stock issued		142,026,000	140,592,000
Long-term debt		2,160,881,000	$ 2,186,893,000
Global One [Member]
Assets acquired:
Cash and due from banks	$ 9,554,000
Commercial and industrial loans	356,665,000
Goodwill	35,247,000
Other intangible assets	13,400,000	$ 13,400,000
Other assets	2,742,000
Total assets acquired	417,608,000
Liabilities assumed:
Notes payable	358,560,000
Contingent consideration	14,000,000
Deferred tax liability, net	3,145,000
Other liabilities	11,903,000
Total liabilities assumed	387,608,000
Consideration paid	30,000,000
Cash paid	3,408,000
Fair value of common stock issued	26,592,000
Loans, unpaid principal balance	356,700,000
Long-term debt	$ 357,000,000