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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Allowance for Loan Losses by Portfolio Segment
The following tables present a summary of changes in the allowance for loan losses by portfolio segment:
Year ended December 31, 2017
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
28.6

$
7.7

$
38.1

$
1.8

$
—

$
76.2

Provision charged (credited) to operating
   expense
6.0

8.1

(2.8
)
(0.2
)
—

11.1

Less loans charged-off
(4.4
)
(11.3
)
(6.8
)
(0.4
)
—

(22.9
)
Add back recoveries of loans previously charged-off
1.4

4.2

2.1

—

—

7.7

Ending balance
$
31.6

$
8.7

$
30.6

$
1.2

$
—

$
72.1

 
 
 
 
 
 
 
Individually evaluated for impairment
$
6.2

$
—

$
4.4

$
0.2

$
—

$
10.8

Collectively evaluated for impairment
25.4

8.7

26.2

1.0

—

61.3

Ending balance
$
31.6

$
8.7

$
30.6

$
1.2

$
—

$
72.1

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
58.3

$
—

$
23.8

$
1.1

$
—

$
83.2

Collectively evaluated for impairment
5,118.5

1,034.4

1,191.6

135.1

4.9

7,484.5

Total loans held for investment
$
5,176.8

$
1,034.4

$
1,215.4

$
136.2

$
4.9

$
7,567.7

Year ended December 31, 2016
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
52.3

$
5.1

$
18.8

$
0.6

$
—

$
76.8

Provision charged (credited) to operating
   expense
(21.7
)
8.4

21.9

1.4

—

10.0

Less loans charged-off
(5.2
)
(8.6
)
(5.8
)
(0.2
)
—

(19.8
)
Add back recoveries of loans previously charged-off
3.2

2.8

3.2

—

—

9.2

Ending balance
$
28.6

$
7.7

$
38.1

$
1.8

$
—

$
76.2

 
 
 
 
 
 
 
Individually evaluated for impairment
$
4.6

$
—

$
9.3

$
0.1

$
—

$
14.0

Collectively evaluated for impairment
24.0

7.7

28.8

1.7

—

62.2

Ending balance
$
28.6

$
7.7

$
38.1

$
1.8

$
—

$
76.2

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
68.6

$
—

$
32.4

$
3.7

$
—

$
104.7

Collectively evaluated for impairment
3,445.4

970.3

765.5

129.2

1.6

5,312.0

Total loans held for investment
$
3,514.0

$
970.3

$
797.9

$
132.9

$
1.6

$
5,416.7


Year ended December 31, 2015
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
53.9

$
5.0

$
14.3

$
1.0

$
—

$
74.2

Provision charged (credited) to operating
   expense
(0.6
)
3.2

4.4

(0.2
)
—

6.8

Less loans charged-off
(4.1
)
(5.7
)
(1.7
)
(0.2
)
—

(11.7
)
Add back recoveries of loans previously charged-off
3.1

2.6

1.8

—

—

7.5

Ending balance
$
52.3

$
5.1

$
18.8

$
0.6

$
—

$
76.8

 
 
 
 
 
 
 
Individually evaluated for impairment
$
4.8

$
—

$
6.5

$
0.3

$
—

$
11.6

Collectively evaluated for impairment
47.5

5.1

12.3

0.3

—

65.2

Ending balance
$
52.3

$
5.1

$
18.8

$
0.6

$
—

$
76.8

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
66.5

$
—

$
24.5

$
1.0

$
—

$
92.0

Collectively evaluated for impairment
3,346.6

844.4

767.9

141.2

1.3

5,101.4

Total loans held for investment
$
3,413.1

$
844.4

$
792.4

$
142.2

$
1.3

$
5,193.4