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Allowance for Loan Losses (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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
(1,035
)
537

1,015

(23
)
6

500

Less loans charged-off
(4,143
)
(1,062
)
(811
)
(4
)
—

(6,020
)
Add back recoveries of loans previously
   charged-off
1,062

473

1,375

3

—

2,913

Ending balance
$
71,666

$
7,088

$
18,652

$
480

$
18

$
97,904

 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
8,367

$
—

$
3,725

$
25

$
—

$
12,117

Loans collectively evaluated for impairment
63,299

7,088

14,927

455

18

85,787

Allowance for loan losses
$
71,666

$
7,088

$
18,652

$
480

$
18

$
97,904

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
114,690

$
—

$
15,832

$
152

$
—

$
130,674

Collectively evaluated for impairment
2,671,943

636,364

673,012

111,259

1,307

4,093,885

Total loans
$
2,786,633

$
636,364

$
688,844

$
111,411

$
1,307

$
4,224,559

Three Months Ended March 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 to operating expense
6,382

(591
)
5,441

18

—

11,250

Less loans charged-off
(5,156
)
(1,312
)
(2,512
)
(107
)
—

(9,087
)
Add back recoveries of loans previously
   charged-off
506

521

126

5

—

1,158

Ending balance
$
89,128

$
7,212

$
18,380

$
1,182

$
—

$
115,902

Loans individually evaluated for impairment
$
26,673

$
—

$
4,126

$
491

$
—

$
31,290

Loans collectively evaluated for impairment
62,455

7,212

14,254

691

—

84,612

Allowance for loan losses
$
89,128

$
7,212

$
18,380

$
1,182

$
—

$
115,902

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
198,033

$
—

$
13,559

$
1,514

$
—

$
213,106

Collectively evaluated for impairment
2,516,946

606,073

694,838

127,085

568

3,945,510

Total loans
$
2,714,979

$
606,073

$
708,397

$
128,599

$
568

$
4,158,616