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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 2012
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, 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

Three Months Ended September 30, 2011
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
90,243

$
8,526

$
24,434

$
1,376

$
—

$
124,579

Provision charged to operating expense
9,984

1,676

2,206

134

—

14,000

Less loans charged-off
(12,210
)
(1,682
)
(6,498
)
(15
)
—

(20,405
)
Add back recoveries of loans previously
   charged-off
1,386

453

287

3

—

2,129

Ending balance
$
89,403

$
8,973

$
20,429

$
1,498

$
—

$
120,303

 
 
 
 
 
 
 
Nine Months Ended September 30, 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 to operating expense
33,080

2,927

8,461

(68
)
—

44,400

Less loans charged-off
(29,598
)
(4,641
)
(14,547
)
(60
)
—

(48,846
)
Add back recoveries of loans previously
   charged-off
1,740

1,355

1,161

13

—

4,269

Ending balance
$
89,403

$
8,973

$
20,429

$
1,498

$
—

$
120,303

 
 
 
 
 
 
 
As of September 30, 2011
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
27,344

$
—

$
9,422

$
239

$
—

$
37,005

Loans collectively evaluated for impairment
62,059

8,973

11,007

1,259

—

83,298

Allowance for loan losses
$
89,403

$
8,973

$
20,429

$
1,498

$
—

$
120,303

 
 
 
 
 
 
 
As of September 30, 2011
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
223,386

$
—

$
31,470

$
880

$
—

$
255,736

Collectively evaluated for impairment
2,582,202

627,139

671,540

135,848

3,252

4,019,981

Total loans
$
2,805,588

$
627,139

$
703,010

$
136,728

$
3,252

$
4,275,717