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Allowance for Loan Losses (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
53,659

$
5,499

$
15,196

$
982

$
—

$
75,336

Provision charged to operating expense
461

646

224

9

—

1,340

Less loans charged-off
(610
)
(837
)
(61
)
—

—

(1,508
)
Add back recoveries of loans previously
   charged-off
425

520

438

1

—

1,384

Ending balance
$
53,935

$
5,828

$
15,797

$
992

$
—

$
76,552

 
 
 
 
 
 
 
Six Months Ended June 30, 2015
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
53,884

$
5,035

$
14,307

$
974

$
—

$
74,200

Provision charged to operating expense
(570
)
1,771

1,217

17

—

2,435

Less loans charged-off
(795
)
(2,138
)
(435
)
—

—

(3,368
)
Add back recoveries of loans previously
   charged-off
1,416

1,160

708

1

—

3,285

Ending balance
$
53,935

$
5,828

$
15,797

$
992

$
—

$
76,552

 
 
 
 
 
 
 
As of June 30, 2015
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
4,824

$
—

$
3,279

$
618

$
—

$
8,721

Loans collectively evaluated for impairment
49,111

5,828

12,518

374

—

67,831

Allowance for loan losses
$
53,935

$
5,828

$
15,797

$
992

$
—

$
76,552

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
75,435

$
—

$
23,573

$
1,485

$
—

$
100,493

Collectively evaluated for impairment
3,264,732

799,126

795,546

141,144

2,905

5,003,453

Total loans
$
3,340,167

$
799,126

$
819,119

$
142,629

$
2,905

$
5,103,946

Three Months Ended June 30, 2014
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
59,830

$
5,377

$
15,701

$
463

$
—

$
81,371

Provision charged to operating expense
(2,011
)
346

(494
)
158

—

(2,001
)
Less loans charged-off
(1,158
)
(934
)
(534
)
—

—

(2,626
)
Add back recoveries of loans previously
   charged-off
651

558

313

—

—

1,522

Ending balance
$
57,312

$
5,347

$
14,986

$
621

$
—

$
78,266

Six Months Ended June 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
(5,386
)
(232
)
(1,566
)
183

—

(7,001
)
Less loans charged-off
(2,243
)
(1,780
)
(1,330
)
(64
)
—

(5,417
)
Add back recoveries of loans previously
   charged-off
1,018

1,166

3,135

26

—

5,345

Ending balance
$
57,312

$
5,347

$
14,986

$
621

$
—

$
78,266

 
 
 
 
 
 
 
As of December 31, 2014
Real Estate

Consumer

Commercial

Agriculture

Other

Total

Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
3,961

$
—

$
1,190

$
641

$
—

$
5,792

Loans collectively evaluated for impairment
49,923

5,035

13,117

333

—

68,408

Allowance for loan losses
$
53,884

$
5,035

$
14,307

$
974

$
—

$
74,200

 
 
 
 
 
 
 
Total loans:
 

 

 

 

 

 

Individually evaluated for impairment
$
62,775

$
—

$
14,526

$
1,179

$
—

$
78,480

Collectively evaluated for impairment
3,203,306

762,471

725,547

123,680

3,959

4,818,963

Total loans
$
3,266,081

$
762,471

$
740,073

$
124,859

$
3,959

$
4,897,443