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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2014
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
57,312

$
5,347

$
14,986

$
621

$
—

$
78,266

Provision charged to operating expense
(3,839
)
423

3,598

67

12

261

Less loans charged-off
(147
)
(1,437
)
(4,678
)
—

(12
)
(6,274
)
Add back recoveries of loans previously
   charged-off
999

495

484

—

—

1,978

Ending balance
$
54,325

$
4,828

$
14,390

$
688

$
—

$
74,231

 
 
 
 
 
 
 
Nine Months Ended September 30, 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
(9,225
)
191

2,032

250

12

(6,740
)
Less loans charged-off
(2,390
)
(3,217
)
(6,008
)
(64
)
(12
)
(11,691
)
Add back recoveries of loans previously
   charged-off
2,017

1,661

3,619

26

—

7,323

Ending balance
$
54,325

$
4,828

$
14,390

$
688

$
—

$
74,231

 
 
 
 
 
 
 
As of September 30, 2014
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
4,805

$
—

$
1,445

$
320

$
—

$
6,570

Loans collectively evaluated for impairment
49,520

4,828

12,945

368

—

67,661

Allowance for loan losses
$
54,325

$
4,828

$
14,390

$
688

$
—

$
74,231

 
 
 
 
 
 
 
As of September 30, 2014
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
70,555

$
—

$
13,669

$
834

$
—

$
85,058

Collectively evaluated for impairment
3,162,534

745,482

723,239

135,753

2,316

4,769,324

Total loans
$
3,233,089

$
745,482

$
736,908

$
136,587

$
2,316

$
4,854,382

Three Months Ended September 30, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
71,503

$
7,040

$
19,475

$
510

$
—

$
98,528

Provision charged to operating expense
(2,820
)
289

(390
)
(79
)
—

(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

$
17,856

$
451

$
—

$
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

$
17,085

$
504

$
—

$
100,511

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

1,409

(75
)
—

(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

$
17,856

$
451

$
—

$
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

13,730

432

—

79,629

Allowance for loan losses
$
67,953

$
6,730

$
17,856

$
451

$
—

$
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