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Other Real Estate Owned (Tables)
 12 Months Ended
Dec. 31, 2017
Repossessed Assets [Abstract]  
Other Real Estate Owned
Information with respect to the Company’s other real estate owned follows:
Year Ended December 31,
2017
 
2016
 
2015
Balance at beginning of year
$
10.0

 
$
6.3

 
$
13.6

Acquisitions
1.2

 
1.1

 
—

Additions
5.4

 
7.6

 
5.6

Valuation adjustments
(0.4
)
 
(0.6
)
 
(0.2
)
Dispositions
(6.1
)
 
(4.4
)
 
(12.7
)
Balance at end of year
$
10.1

 
$
10.0

 
$
6.3