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Allowance for Loan Losses (Tables)
 3 Months Ended
Mar. 31, 2014
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 for the periods indicated. 
Three Months Ended March 31, 2014
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
63,923

$
6,193

$
14,747

$
476

$
—

$
85,339

Provision charged to operating expense
(3,375
)
(578
)
(1,072
)
25

—

(5,000
)
Less loans charged-off
(1,085
)
(846
)
(796
)
(64
)
—

(2,791
)
Add back recoveries of loans previously
   charged-off
367

608

2,822

26

—

3,823

Ending balance
$
59,830

$
5,377

$
15,701

$
463

$
—

$
81,371

 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
5,952

$
—

$
1,458

$
84

$
—

$
7,494

Loans collectively evaluated for impairment
53,878

5,377

14,243

379

—

73,877

Allowance for loan losses
$
59,830

$
5,377

$
15,701

$
463

$
—

$
81,371

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
86,772

$
—

$
14,464

$
693

$
—

$
101,929

Collectively evaluated for impairment
2,788,421

670,406

692,773

107,683

3,626

4,262,909

Total loans
$
2,875,193

$
670,406

$
707,237

$
108,376

$
3,626

$
4,364,838

Three Months Ended March 31, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
75,782

$
7,140

$
17,085

$
504

$
—

$
100,511

Provision charged to operating expense
(1,035
)
537

1,021

(23
)
—

500

Less loans charged-off
(4,143
)
(1,062
)
(811
)
(4
)
—

(6,020
)
Add back recoveries of loans previously
   charged-off
1,062

473

1,375

3

—

2,913

Ending balance
$
71,666

$
7,088

$
18,670

$
480

$
—

$
97,904

Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
8,367

$
—

$
3,725

$
25

$
—

$
12,117

Loans collectively evaluated for impairment
63,299

7,088

14,945

455

—

85,787

Allowance for loan losses
$
71,666

$
7,088

$
18,670

$
480

$
—

$
97,904

 
 
 
 
 
 
 
Total loans:
 

 

 

 

 

 

Individually evaluated for impairment
$
114,690

$
—

$
15,832

$
152

$
—

$
130,674

Collectively evaluated for impairment
2,671,943

636,364

673,012

111,259

1,307

4,093,885

Total loans
$
2,786,633

$
636,364

$
688,844

$
111,411

$
1,307

$
4,224,559