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Reserve for Loan and Lease Losses (Tables)
 12 Months Ended
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]  
Schedule of changes in reserve for loan and lease losses, segregated by class
The following table shows the changes in the reserve for loan and lease losses, segregated by class, for each of the three years ended December 31.
(Dollars in thousands) 
 
Commercial and agricultural
 
Auto and light truck
 
Medium and heavy duty truck
 
Aircraft
 
Construction equipment
 
Commercial real estate
 
Residential real estate and home equity
 
Consumer
 
Total
2017
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Balance, beginning of year
 
$
14,668

 
$
8,064

 
$
4,740

 
$
34,352

 
$
8,207

 
$
13,677

 
$
3,550

 
$
1,285

 
$
88,543

Charge-offs
 
2,415

 
774

 
—

 
1,872

 
164

 
344

 
124

 
836

 
6,529

Recoveries
 
984

 
1,153

 
—

 
227

 
298

 
851

 
109

 
267

 
3,889

Net charge-offs (recoveries)
 
1,431

 
(379
)
 
—

 
1,645

 
(134
)
 
(507
)
 
15

 
569

 
2,640

Provision (recovery of provision)
 
2,991

 
1,660

 
104

 
1,912

 
1,002

 
608

 
131

 
572

 
8,980

Balance, end of year
 
$
16,228

 
$
10,103

 
$
4,844

 
$
34,619

 
$
9,343

 
$
14,792

 
$
3,666

 
$
1,288

 
$
94,883

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2016
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Balance, beginning of year
 
$
15,456

 
$
9,269

 
$
4,699

 
$
32,373

 
$
7,592

 
$
13,762

 
$
3,662

 
$
1,299

 
$
88,112

Charge-offs
 
547

 
4

 
—

 
6,123

 
128

 
32

 
219

 
888

 
7,941

Recoveries
 
509

 
253

 
10

 
528

 
461

 
469

 
31

 
278

 
2,539

Net charge-offs (recoveries)
 
38

 
(249
)
 
(10
)
 
5,595

 
(333
)
 
(437
)
 
188

 
610

 
5,402

Provision (recovery of provision)
 
(750
)
 
(1,454
)
 
31

 
7,574

 
282

 
(522
)
 
76

 
596

 
5,833

Balance, end of year
 
$
14,668

 
$
8,064

 
$
4,740

 
$
34,352

 
$
8,207

 
$
13,677

 
$
3,550

 
$
1,285

 
$
88,543

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2015
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Balance, beginning of year
 
$
11,760

 
$
10,326

 
$
4,500

 
$
32,234

 
$
7,008

 
$
13,270

 
$
4,504

 
$
1,466

 
$
85,068

Charge-offs
 
3,489

 
24

 
—

 
244

 
—

 
—

 
295

 
658

 
4,710

Recoveries
 
851

 
380

 
28

 
802

 
434

 
2,807

 
34

 
258

 
5,594

Net charge-offs (recoveries)
 
2,638

 
(356
)
 
(28
)
 
(558
)
 
(434
)
 
(2,807
)
 
261

 
400

 
(884
)
Provision (recovery of provision)
 
6,334

 
(1,413
)
 
171

 
(419
)
 
150

 
(2,315
)
 
(581
)
 
233

 
2,160

Balance, end of year
 
$
15,456

 
$
9,269

 
$
4,699

 
$
32,373

 
$
7,592

 
$
13,762

 
$
3,662

 
$
1,299

 
$
88,112


The following table shows the reserve for loan and lease losses and recorded investment in loans and leases, segregated by class, separated by individually and collectively evaluated for impairment as of December 31, 2017 and 2016.
(Dollars in thousands) 
 
Commercial and agricultural
 
Auto and light truck
 
Medium and heavy duty truck
 
Aircraft
 
Construction equipment
 
Commercial real estate
 
Residential real estate and home equity
 
Consumer
 
Total
December 31, 2017
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Reserve for loan and lease losses
 
 
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Ending balance, individually evaluated for impairment
 
$
—

 
$
243

 
$
—

 
$
—

 
$
108

 
$
181

 
$
134

 
$
—

 
$
666

Ending balance, collectively evaluated for impairment
 
16,228

 
9,860

 
4,844

 
34,619

 
9,235

 
14,611

 
3,532

 
1,288

 
94,217

Total reserve for loan and lease losses
 
$
16,228

 
$
10,103

 
$
4,844

 
$
34,619

 
$
9,343

 
$
14,792

 
$
3,666

 
$
1,288

 
$
94,883

Recorded investment in loans
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Ending balance, individually evaluated for impairment
 
$
2,439

 
$
7,780

 
$
371

 
$
1,901

 
$
928

 
$
3,346

 
$
352

 
$
—

 
$
17,117

Ending balance, collectively evaluated for impairment
 
927,558

 
489,036

 
296,564

 
842,756

 
562,509

 
738,222

 
525,770

 
128,146

 
4,510,561

Total recorded investment in loans
 
$
929,997

 
$
496,816

 
$
296,935

 
$
844,657

 
$
563,437

 
$
741,568

 
$
526,122

 
$
128,146

 
$
4,527,678

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Reserve for loan and lease losses
 
 
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Ending balance, individually evaluated for impairment
 
$
297

 
$
—

 
$
—

 
$
1,076

 
$
35

 
$
322

 
$
148

 
$
—

 
$
1,878

Ending balance, collectively evaluated for impairment
 
14,371

 
8,064

 
4,740

 
33,276

 
8,172

 
13,355

 
3,402

 
1,285

 
86,665

Total reserve for loan and lease losses
 
$
14,668

 
$
8,064

 
$
4,740

 
$
34,352

 
$
8,207

 
$
13,677

 
$
3,550

 
$
1,285

 
$
88,543

Recorded investment in loans
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Ending balance, individually evaluated for impairment
 
$
3,590

 
$
115

 
$
—

 
$
6,110

 
$
1,167

 
$
5,372

 
$
674

 
$
—

 
$
17,028

Ending balance, collectively evaluated for impairment
 
808,674

 
411,649

 
294,790

 
796,304

 
494,758

 
713,798

 
521,257

 
129,813

 
4,171,043

Total recorded investment in loans
 
$
812,264

 
$
411,764

 
$
294,790

 
$
802,414

 
$
495,925

 
$
719,170

 
$
521,931

 
$
129,813

 
$
4,188,071