Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2020

Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]

Schedule of changes in allowance for loan and lease losses, segregated by class

The following table shows the changes in the allowance for loan and lease losses, segregated by portfolio segment, 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
2020
Balance, beginning of year	$	23,671	$	14,400	$	4,612	$	31,058	$	14,120	$	18,350	$	3,609	$	1,434	$	111,254
Impact of ASC 326 adoption	(655)		(1,303)		2,414		484		372		(649)		1,688		233		2,584
Adjusted balance, beginning of year	23,016		13,097		7,026		31,542		14,492		17,701		5,297		1,667		113,838
Charge-offs	903		7,107		15		855		4,090		37		74		893		13,974
Recoveries	663		499		18		1,800		1,415		58		33		303		4,789
Net charge-offs	240		6,608		(3)		(945)		2,675		(21)		41		590		9,185
Provision (recovery of provision)	(547)		22,437		(629)		1,566		7,349		5,036		118		671		36,001
Balance, end of year	$	22,229	$	28,926	$	6,400	$	34,053	$	19,166	$	22,758	$	5,374	$	1,748	$	140,654
2019
Balance, beginning of year	$	17,063	$	14,689	$	4,303	$	33,047	$	10,922	$	15,705	$	3,425	$	1,315	$	100,469
Charge-offs	1,040		991		1,132		3,066		238		5		53		1,066		7,591
Recoveries	664		97		32		1,143		160		75		85		287		2,543
Net charge-offs (recoveries)	376		894		1,100		1,923		78		(70)		(32)		779		5,048
Provision (recovery of provision)	6,984		605		1,409		(66)		3,276		2,575		152		898		15,833
Balance, end of year	$	23,671	$	14,400	$	4,612	$	31,058	$	14,120	$	18,350	$	3,609	$	1,434	$	111,254
2018
Balance, beginning of year	$	16,228	$	10,103	$	4,844	$	34,619	$	9,343	$	14,792	$	3,666	$	1,288	$	94,883
Charge-offs	229		3,308		23		12,222		288		70		63		909		17,112
Recoveries	222		68		—		2,499		100		53		23		271		3,236
Net charge-offs (recoveries)	7		3,240		23		9,723		188		17		40		638		13,876
Provision (recovery of provision)	842		7,826		(518)		8,151		1,767		930		(201)		665		19,462
Balance, end of year	$	17,063	$	14,689	$	4,303	$	33,047	$	10,922	$	15,705	$	3,425	$	1,315	$	100,469

Schedule of changes in allowance for credit losses on unfunded loan commitments

The following table shows the changes in the liability for credit losses on unfunded loan commitments for each of the three years ended December 31.

(Dollars in thousands)	2020		2019		2018
Balance, beginning of year	$	3,172	$	3,075	$	3,050
Impact of ASC 326 adoption	777		—		—
Adjusted balance, beginning of year	3,949		3,075		3,050
Provision (recovery of provision)	550		97		25
Balance, end of year	$	4,499	$	3,172	$	3,075