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Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 2017
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 September 30, 2017
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
33,498

$
7,554

$
33,124

$
1,525

$
—

$
75,701

Provision charged to operating expense
(690
)
2,620

1,530

(17
)
—

3,443

Less loans charged-off
(1,695
)
(3,115
)
(2,609
)
(41
)
—

(7,460
)
Add back recoveries of loans previously
   charged-off
613

962

1,313

—

—

2,888

Ending balance
$
31,726

$
8,021

$
33,358

$
1,467

$
—

$
74,572

 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Beginning balance
$
28,625

$
7,711

$
38,092

$
1,786

$
—

$
76,214

Provision charged to operating expense
4,775

5,157

(2,145
)
(259
)
—

7,528

Less loans charged-off
(2,938
)
(8,123
)
(4,450
)
(111
)
—

(15,622
)
Add back recoveries of loans previously
   charged-off
1,264

3,276

1,861

51

—

6,452

Ending balance
$
31,726

$
8,021

$
33,358

$
1,467

$
—

$
74,572

 
 
 
 
 
 
 
As of September 30, 2017
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
7,028

$
14

$
6,426

$
435

$
—

$
13,903

Loans collectively evaluated for impairment
24,698

8,007

26,932

1,032

—

60,669

Allowance for loan losses
$
31,726

$
8,021

$
33,358

$
1,467

$
—

$
74,572

 
 
 
 
 
 
 
Loans held for investment:
 
 
 
 
 
 
Individually evaluated for impairment
$
57,492

$
25

$
31,371

$
1,560

$
—

$
90,448

Collectively evaluated for impairment
5,063,619

1,038,559

1,154,836

151,121

3,804

7,411,939

Total loans
$
5,121,111

$
1,038,584

$
1,186,207

$
152,681

$
3,804

$
7,502,387

Three Months Ended September 30, 2016
Real Estate
Consumer
Commercial
Agriculture
Other
Total
Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
32,281

$
6,315

$
39,995

$
1,749

$
—

$
80,340

Provision charged to operating expense
(352
)
2,395

265

55

—

2,363

Less loans charged-off
(379
)
(2,157
)
(579
)
—

—

(3,115
)
Add back recoveries of loans previously
   charged-off
221

742

680

4

—

1,647

Ending balance
$
31,771

$
7,295

$
40,361

$
1,808

$
—

$
81,235

Nine Months Ended September 30, 2016
Real Estate

Consumer

Commercial

Agriculture

Other

Total

Allowance for loan losses:
 

 

 

 

 

 

Beginning balance
$
52,296

$
5,144

$
18,775

$
602

$
—

$
76,817

Provision charged to operating expense
(20,492
)
5,747

22,268

1,390

—

8,913

Less loans charged-off
(2,824
)
(5,761
)
(2,085
)
(188
)
—

(10,858
)
Add back recoveries of loans previously
   charged-off
2,791

2,165

1,403

4

—

6,363

Ending balance
$
31,771

$
7,295

$
40,361

$
1,808

$
—

$
81,235

 
 
 
 
 
 
 
As of December 31, 2016
Real Estate

Consumer

Commercial

Agriculture

Other
Total
Allowance for loan losses:
 
 
 
 
 
 
Loans individually evaluated for impairment
$
4,588

$
—

$
9,254

$
112

$
—

$
13,954

Loans collectively evaluated for impairment
24,037

7,711

28,838

1,674

—

62,260

Allowance for loan losses
$
28,625

$
7,711

$
38,092

$
1,786

$
—

$
76,214

 
 
 
 
 
 
 
Loans held for investment:
 

 

 

 

 

 

Individually evaluated for impairment
$
68,632

$
—

$
32,397

$
3,662

$
—

$
104,691

Collectively evaluated for impairment
3,445,451

970,266

765,545

129,196

1,601

5,312,059

Total loans
$
3,514,083

$
970,266

$
797,942

$
132,858

$
1,601

$
5,416,750