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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 2013
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 September 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
71,503

$
7,040

$
19,442

$
510

$
33

$
98,528

Provision charged to operating expense
(2,820
)
289

(377
)
(79
)
(13
)
(3,000
)
Less loans charged-off
(2,129
)
(1,083
)
(1,703
)
—

—

(4,915
)
Add back recoveries of loans previously
   charged-off
1,399

484

474

20

—

2,377

Ending balance
$
67,953

$
6,730

$
17,836

$
451

$
20

$
92,990

 
 
 
 
 
 
 
Nine Months Ended September 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
75,782

$
7,140

$
17,073

$
504

$
12

$
100,511

Provision charged to operating expense
(4,864
)
1,405

1,401

(75
)
8

(2,125
)
Less loans charged-off
(8,299
)
(3,444
)
(3,083
)
(4
)
—

(14,830
)
Add back recoveries of loans previously
   charged-off
5,334

1,629

2,445

26

—

9,434

Ending balance
$
67,953

$
6,730

$
17,836

$
451

$
20

$
92,990

 
 
 
 
 
 
 
As of September 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
9,216

$
—

$
4,126

$
19

$
—

$
13,361

Loans collectively evaluated for impairment
58,737

6,730

13,710

432

20

79,629

Allowance for loan losses
$
67,953

$
6,730

$
17,836

$
451

$
20

$
92,990

 
 
 
 
 
 
 
As of September 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
97,717

$
—

$
13,743

$
116

$
—

$
111,576

Collectively evaluated for impairment
2,755,298

672,184

667,673

123,449

1,912

4,220,516

Total loans
$
2,853,015

$
672,184

$
681,416

$
123,565

$
1,912

$
4,332,092

Three Months Ended September 30, 2012
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
77,723

$
7,274

$
16,675

$
1,122

$
—

$
102,794

Provision charged to operating expense
5,371

192

4,222

(285
)
—

9,500

Less loans charged-off
(9,138
)
(1,340
)
(4,335
)
—

—

(14,813
)
Add back recoveries of loans previously
   charged-off
387

465

666

7

—

1,525

Ending balance
$
74,343

$
6,591

$
17,228

$
844

$
—

$
99,006

Nine Months Ended September 30, 2012
Real Estate

Consumer

Commercial

Agriculture

Other

Total

Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
87,396

$
8,594

$
15,325

$
1,266

$
—

$
112,581

Provision charged to operating expense
22,172

385

10,530

(337
)
—

32,750

Less loans charged-off
(36,645
)
(3,862
)
(10,028
)
(110
)
—

(50,645
)
Add back recoveries of loans previously
   charged-off
1,420

1,474

1,401

25

—

4,320

Ending balance
$
74,343

$
6,591

$
17,228

$
844

$
—

$
99,006

 
 
 
 
 
 
 
As of September 30, 2012
Real Estate

Consumer

Commercial

Agriculture

Other

Total

Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
11,348

$
—

$
2,924

$
412

$
—

$
14,684

Loans collectively evaluated for impairment
62,995

6,591

14,304

432

—

84,322

Allowance for loan losses
$
74,343

$
6,591

$
17,228

$
844

$
—

$
99,006

 
 
 
 
 
 
 
As of September 30, 2012
Real Estate

Consumer

Commercial

Agriculture

Other

Total

Total loans:
 

 

 

 

 

 

Individually evaluated for impairment
$
140,460

$
—

$
13,408

$
590

$
—

$
154,458

Collectively evaluated for impairment
2,600,908

629,757

658,692

134,877

1,359

4,025,593

Total loans
$
2,741,368

$
629,757

$
672,100

$
135,467

$
1,359

$
4,180,051