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Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Changes in Allowance for Loan Losses
Changes in the allowance for loan losses for the years ended December 31, 2018, 2017 and 2016 were as follows, in thousands:
 
2018
 
2017
 
2016
Balance at beginning of year
$
55,686

 
$
54,324

 
$
48,685

Provision for loan losses
24,013

 
15,563

 
11,694

Recoveries on loans previously charged-off
3,549

 
3,670

 
5,339

Loans charged-off
(21,285
)
 
(17,871
)
 
(11,394
)
Balance at end of year
$
61,963

 
$
55,686

 
$
54,324


Changes in the allowance for loan losses by loan category for the years ended December 31, 2018, and December 31, 2017, were as follows, in thousands:
 
Commercial
 
Commercial
Real Estate
 
Agricultural
 
Residential
Real Estate
 
Consumer
 
Total
Balance at December 31, 2017
$
18,098

 
$
21,950

 
$
4,258

 
$
2,224

 
$
9,156

 
$
55,686

Charge-offs
(7,916
)
 
(1,977
)
 
(1,437
)
 
(372
)
 
(9,583
)
 
(21,285
)
Recoveries
978

 
1,047

 
13

 
96

 
1,415

 
3,549

Provision
13,345

 
4,518

 
2,119

 
(163
)
 
4,194

 
24,013

Balance at December 31, 2018
$
24,505

 
$
25,538

 
$
4,953

 
$
1,785

 
$
5,182

 
$
61,963



 
Commercial
 
Commercial
Real Estate
 
Agricultural
 
Residential
Real Estate
 
Consumer
 
Total
Balance at December 31, 2016
$
14,765

 
$
24,319

 
$
4,210

 
$
2,263

 
$
8,767

 
$
54,324

Charge-offs
(4,640
)
 
(2,712
)
 
(2,916
)
 
(800
)
 
(6,803
)
 
(17,871
)
Recoveries
811

 
1,192

 
18

 
358

 
1,291

 
3,670

Provision
7,162

 
(849
)
 
2,946

 
403

 
5,901

 
15,563

Balance at December 31, 2017
$
18,098

 
$
21,950

 
$
4,258

 
$
2,224

 
$
9,156

 
$
55,686