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Allowance For Loan Losses
 3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Allowance For Loan Losses
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


    
The Company performs a quarterly assessment of the adequacy of its allowance for loan losses in accordance with generally accepted accounting principles. The methodology used to assess the adequacy is consistently applied to the Company's loan portfolio and consists of three elements: (1) specific valuation allowances based on probable losses on impaired loans; (2) historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends; and (3) general valuation allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions and other qualitative risk factors both internal and external to the Company.
    
Specific allowances are established for loans where management has determined that probability of a loss exists by analyzing the borrower’s ability to repay amounts owed, collateral deficiencies and any relevant qualitative or economic factors impacting the loan. Historical valuation allowances are determined by applying percentage loss factors to the credit exposures from outstanding loans. For commercial, agricultural and real estate loans, loss factors are applied based on the internal risk classifications of these loans. For consumer loans, loss factors are applied on a portfolio basis. For commercial, agriculture and real estate loans, loss factor percentages are based on a migration analysis of our historical loss experience, designed to account for credit deterioration. For consumer loans, loss factor percentages are based on a one-year loss history. General valuation allowances are determined by evaluating, on a quarterly basis, changes in the nature and volume of the loan portfolio, overall portfolio quality, industry concentrations, current economic and regulatory conditions and the estimated impact of these factors on historical loss rates.    

An allowance for loan losses is established for loans acquired credit impaired and for which the Company projects a decrease in the expected cash flows in periods subsequent to the acquisition of such loans. As of March 31, 2015, the Company's allowance for loan losses included $117 related to acquired credit impaired loans.