Business Combinations (Narrative) (Details) (USD $)
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12 Months Ended | 24 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | |||||||||||
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Dec. 31, 2013
segment
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Dec. 31, 2013
segment
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Dec. 31, 2011
financial_institution
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Oct. 18, 2013
Diamond
locations
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May 01, 2013
First Lansing Bancorp, Inc. [Member]
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Dec. 12, 2012
HPK Financial Corporation [Member]
locations
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Apr. 13, 2012
Suburban Bank And Trust Company [Member]
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Mar. 30, 2012
Suburban Bank And Trust Company [Member]
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Sep. 30, 2011
Elgin State Bancorp Inc [Member]
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Sep. 29, 2011
Elgin State Bancorp Inc [Member]
locations
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Jun. 08, 2012
Macquarie Premium Funding Inc [Member]
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Jul. 02, 2011
Great Lakes Advisors [Member]
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Jun. 30, 2011
Great Lakes Advisors [Member]
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Oct. 02, 2013
Surety Financial Services [Member]
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Sep. 30, 2013
Surety Financial Services [Member]
locations
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Apr. 13, 2011
River City of Bloomington, Minnesota [Member]
locations
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Dec. 31, 2010
River City of Bloomington, Minnesota [Member]
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Feb. 03, 2011
Woodfield of Rolling Meadows, Illinois [Member]
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Dec. 31, 2010
Woodfield of Rolling Meadows, Illinois [Member]
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May 01, 2013
Chicago, Illinois [Member]
First Lansing Bancorp, Inc. [Member]
locations
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May 01, 2013
Northwest Indiana [Member]
First Lansing Bancorp, Inc. [Member]
locations
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Feb. 01, 2013
Second Federal [Member]
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Business Acquisition [Line Items] | ||||||||||||||||||||||
Number of Reportable Segments | 3 | 3 | ||||||||||||||||||||
Date of acquisition | Oct. 18, 2013 | May 01, 2013 | Dec. 12, 2012 | Apr. 13, 2012 | Mar. 30, 2012 | Sep. 30, 2011 | Jun. 08, 2012 | Jul. 01, 2011 | Oct. 01, 2013 | Apr. 13, 2011 | Feb. 03, 2011 | |||||||||||
Number of Locations | 4 | 2 | 3 | 5 | 7 | 1 | ||||||||||||||||
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 172,500,000 | $ 373,400,000 | $ 371,600,000 | $ 263,200,000 | $ 26,000,000 | |||||||||||||||||
Fair value of loans acquired, at the acquisition date | 91,700,000 | 123,000,000 | 118,500,000 | 3,000,000 | 146,700,000 | 213,000,000 | ||||||||||||||||
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 169,100,000 | 334,700,000 | 344,100,000 | 248,400,000 | 8,800,000 | |||||||||||||||||
Fair value of deposits | 140,200,000 | 331,400,000 | 243,800,000 | 52,000,000 | 241,100,000 | |||||||||||||||||
Additional goodwill recorded on acquisition | 31,846,000 | 8,400,000 | 14,000,000 | 12,600,000 | 1,500,000 | 1,800,000 | 5,000,000 | 21,900,000 | 15,700,000 | 9,500,000 | ||||||||||||
Number of FDIC-assisted banks acquired | 6 | |||||||||||||||||||||
FDIC loss sharing percentage on purchased loans, OREO, and certain other assets | 80.00% | |||||||||||||||||||||
Divestiture of Businesses, Deposits Disposed | 149,000,000 | |||||||||||||||||||||
Assets under management, carrying amount | 160,000,000 | 2,400,000,000 | ||||||||||||||||||||
Mortgage Loan Originations | $ 1,000,000,000 | $ 500,000,000 | $ 180,000,000 | |||||||||||||||||||
Number of States in which Entity Operates | 5 |