Mergers and Acquisitions - Pro Forma Information (Details) - Talmer Bank - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition
Net interest and other income	$ 179,516	$ 168,130	$ 347,623	$ 326,100
Net Income	$ 52,014	$ 42,111	$ 99,618	$ 81,163
Earnings per share:
Basic (dollars per share)	$ 0.73	$ 0.60	$ 1.41	$ 1.15
Diluted (dollars per share)	$ 0.73	$ 0.59	$ 1.39	$ 1.14

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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