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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of Allowance for Loan Losses by Portfolio Segment
The following table presents a summary of changes in the allowance for loan losses by portfolio segment:
Year ended December 31, 2013
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
75,782

$
7,141

$
17,085

$
503

$
—

$
100,511

Provision charged (credited) to operating
   expense
(7,722
)
1,605

41

(49
)
—

(6,125
)
Less loans charged-off
(10,224
)
(4,612
)
(5,672
)
(5
)
—

(20,513
)
Add back recoveries of loans previously charged-off
6,087

2,059

3,293

27

—

11,466

Ending balance
$
63,923

$
6,193

$
14,747

$
476

$
—

$
85,339

 
 
 
 
 
 
 
Individually evaluated for impairment
$
7,339

$
—

$
1,504

$
86

$
—

$
8,929

Collectively evaluated for impairment
56,584

6,193

13,243

390

—

76,410

Ending balance
$
63,923

$
6,193

$
14,747

$
476

$
—

$
85,339

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
96,862

$
—

$
13,585

$
125

$
—

$
110,572

Collectively evaluated for impairment
2,786,254

671,587

662,959

111,747

1,734

4,234,281

Total loans
$
2,883,116

$
671,587

$
676,544

$
111,872

$
1,734

$
4,344,853

Year ended December 31, 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 (credited) to operating
   expense
28,651

1,922

10,845

(668
)
—

40,750

Less loans charged-off
(43,506
)
(5,320
)
(11,990
)
(120
)
—

(60,936
)
Add back recoveries of loans previously charged-off
3,241

1,945

2,905

25

—

8,116

Ending balance
$
75,782

$
7,141

$
17,085

$
503

$
—

$
100,511

 
 
 
 
 
 
 
Individually evaluated for impairment
$
8,350

$
—

$
1,919

$
28

$
—

$
10,297

Collectively evaluated for impairment
67,432

7,141

15,166

475

—

90,214

Ending balance
$
75,782

$
7,141

$
17,085

$
503

$
—

$
100,511

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
123,406

$
—

$
12,242

$
537

$
—

$
136,185

Collectively evaluated for impairment
2,660,420

636,794

676,511

113,090

912

4,087,727

Total loans
$
2,783,826

$
636,794

$
688,753

$
113,627

$
912

$
4,223,912


Year ended December 31, 2011
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
84,181

$
9,332

$
25,354

$
1,613

$
—

$
120,480

Provision charged (credited) to operating
   expense
46,844

3,566

7,959

(218
)
—

58,151

Less loans charged-off
(45,764
)
(6,043
)
(19,332
)
(142
)
—

(71,281
)
Add back recoveries of loans previously charged-off
2,135

1,739

1,344

13

—

5,231

Ending balance
$
87,396

$
8,594

$
15,325

$
1,266

$
—

$
112,581

 
 
 
 
 
 
 
Individually evaluated for impairment
$
28,023

$
—

$
4,664

$
151

$
—

$
32,838

Collectively evaluated for impairment
59,373

8,594

10,661

1,115

—

79,743

Ending balance
$
87,396

$
8,594

$
15,325

$
1,266

$
—

$
112,581

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
210,199

$
—

$
19,638

$
759

$
—

$
230,596

Collectively evaluated for impairment
2,544,495

616,071

673,623

118,951

2,813

3,955,953

Total loans
$
2,754,694

$
616,071

$
693,261

$
119,710

$
2,813

$
4,186,549