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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Changes in Allowance for Loan Losses
Changes in the allowance for loan losses for the years ended December 31, 2016, 2015 and 2014 were as follows, in thousands:
 
2016
 
2015
 
2014
Balance at beginning of year
$
48,685

 
$
41,449

 
$
41,685

Provision for loan losses
11,694

 
12,697

 
14,501

Recoveries on loans previously charged-off
5,339

 
3,553

 
3,990

Loans charged-off
(11,394
)
 
(9,014
)
 
(18,727
)
Balance at end of year
$
54,324

 
$
48,685

 
$
41,449


Changes in the allowance for loan losses by loan category for the years ended December 31, 2016, and December 31, 2015, were as follows, in thousands:
 
Commercial
 
Commercial
Real Estate
 
Agricultural
 
Residential
Real Estate
 
Consumer
 
Total
Balance at December 31, 2015
$
16,095

 
$
19,532

 
$
3,887

 
$
1,934

 
$
7,237

 
$
48,685

Charge-offs
(1,348
)
 
(2,868
)
 
(214
)
 
(346
)
 
(6,618
)
 
(11,394
)
Recoveries
930

 
3,327

 
10

 
29

 
1,043

 
5,339

Provision
(912
)
 
4,328

 
527

 
646

 
7,105

 
11,694

Balance at December 31, 2016
$
14,765

 
$
24,319

 
$
4,210

 
$
2,263

 
$
8,767

 
$
54,324



 
Commercial
 
Commercial
Real Estate
 
Agricultural
 
Residential
Real Estate
 
Consumer
 
Total
Balance at December 31, 2014
$
11,909

 
$
15,898

 
$
3,295

 
$
3,741

 
$
6,606

 
$
41,449

Charge-offs
(1,887
)
 
(1,368
)
 
(551
)
 
(241
)
 
(4,967
)
 
(9,014
)
Recoveries
1,167

 
1,200

 
32

 
183

 
971

 
3,553

Provision
4,906

 
3,802

 
1,111

 
(1,749
)
 
4,627

 
12,697

Balance at December 31, 2015
$
16,095

 
$
19,532

 
$
3,887

 
$
1,934

 
$
7,237

 
$
48,685