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Allowance for Loan Losses (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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
(1,031
)
1,125

993

8

—

1,095

Less loans charged-off
(186
)
(1,301
)
(374
)
—

—

(1,861
)
Add back recoveries of loans previously
   charged-off
992

640

270

—

—

1,902

Ending balance
$
53,659

$
5,499

$
15,196

$
982

$
—

$
75,336

 
 
 
 
 
 
 
Loans individually evaluated for impairment
$
3,958

$
—

$
2,905

$
605

$
—

$
7,468

Loans collectively evaluated for impairment
49,701

5,499

12,291

377

—

67,868

Allowance for loan losses
$
53,659

$
5,499

$
15,196

$
982

$
—

$
75,336

 
 
 
 
 
 
 
Total loans:
 
 
 
 
 
 
Individually evaluated for impairment
$
62,780

$
—

$
21,192

$
1,061

$
—

$
85,033

Collectively evaluated for impairment
3,223,969

768,462

732,957

116,508

377

4,842,273

Total loans
$
3,286,749

$
768,462

$
754,149

$
117,569

$
377

$
4,927,306

Three Months Ended March 31, 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
(3,375
)
(578
)
(1,072
)
25

—

(5,000
)
Less loans charged-off
(1,085
)
(846
)
(796
)
(64
)
—

(2,791
)
Add back recoveries of loans previously
   charged-off
367

608

2,822

26

—

3,823

Ending balance
$
59,830

$
5,377

$
15,701

$
463

$
—

$
81,371

Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
5,952

$
—

$
1,458

$
84

$
—

$
7,494

Loans collectively evaluated for impairment
53,878

5,377

14,243

379

—

73,877

Allowance for loan losses
$
59,830

$
5,377

$
15,701

$
463

$
—

$
81,371

 
 
 
 
 
 
 
Total loans:
 

 

 

 

 

 

Individually evaluated for impairment
$
86,772

$
—

$
14,464

$
693

$
—

$
101,929

Collectively evaluated for impairment
2,788,421

670,406

692,773

107,683

3,626

4,262,909

Total loans
$
2,875,193

$
670,406

$
707,237

$
108,376

$
3,626

$
4,364,838