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Allowance for Loan Losses (Tables)
 6 Months Ended
Jun. 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 June 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
71,666

$
7,088

$
18,652

$
480

$
18

$
97,904

Provision charged to operating expense
(1,009
)
579

763

27

15

375

Less loans charged-off
(2,027
)
(1,299
)
(569
)
—

—

(3,895
)
Add back recoveries of loans previously
   charged-off
2,873

672

596

3

—

4,144

Ending balance
$
71,503

$
7,040

$
19,442

$
510

$
33

$
98,528

 
 
 
 
 
 
 
Six Months Ended June 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
(2,044
)
1,116

1,778

4

21

875

Less loans charged-off
(6,170
)
(2,361
)
(1,380
)
(4
)
—

(9,915
)
Add back recoveries of loans previously
   charged-off
3,935

1,145

1,971

6

—

7,057

Ending balance
$
71,503

$
7,040

$
19,442

$
510

$
33

$
98,528

 
 
 
 
 
 
 
As of June 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
10,267

$
—

$
5,205

$
22

$
—

$
15,494

Loans collectively evaluated for impairment
61,236

7,040

14,237

488

33

83,034

Allowance for loan losses
$
71,503

$
7,040

$
19,442

$
510

$
33

$
98,528

 
 
 
 
 
 
 
As of June 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
107,241

$
—

$
16,710

$
139

$
—

$
124,090

Collectively evaluated for impairment
2,732,400

652,944

664,041

121,391

2,498

4,173,274

Total loans
$
2,839,641

$
652,944

$
680,751

$
121,530

$
2,498

$
4,297,364

Three Months Ended June 30, 2012
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
89,128

$
7,212

$
18,380

$
1,182

$
—

$
115,902

Provision charged to operating expense
10,419

784

866

(69
)
—

12,000

Less loans charged-off
(22,350
)
(1,210
)
(3,180
)
(5
)
—

(26,745
)
Add back recoveries of loans previously
   charged-off
526

488

609

14

—

1,637

Ending balance
$
77,723

$
7,274

$
16,675

$
1,122

$
—

$
102,794

Six Months Ended June 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
16,801

193

6,307

(51
)
—

23,250

Less loans charged-off
(27,506
)
(2,522
)
(5,692
)
(112
)
—

(35,832
)
Add back recoveries of loans previously
   charged-off
1,032

1,009

735

19

—

2,795

Ending balance
$
77,723

$
7,274

$
16,675

$
1,122

$
—

$
102,794

 
 
 
 
 
 
 
As of June 30, 2012
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
15,199

$
—

$
2,339

$
405

$
—

$
17,943

Loans collectively evaluated for impairment
62,524

7,274

14,336

717

—

84,851

Allowance for loan losses
$
77,723

$
7,274

$
16,675

$
1,122

$
—

$
102,794

 
 
 
 
 
 
 
As of June 30, 2012
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
150,026

$
—

$
11,974

$
500

$
—

$
162,500

Collectively evaluated for impairment
2,538,281

621,212

708,036

137,615

2,319

4,007,463

Total loans
$
2,688,307

$
621,212

$
720,010

$
138,115

$
2,319

$
4,169,963