Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2023

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		Renewable energy		Auto and light truck		Medium and heavy duty truck		Aircraft		Construction equipment		Commercial real estate		Residential real estate and home equity		Consumer		Total
2023
Balance, beginning of year	$	14,635	$	7,217	$	18,634	$	7,566	$	41,093	$	24,039	$	17,431	$	6,478	$	2,175	$	139,268
Charge-offs	4,305		—		729		—		—		54		248		101		1,211		6,648
Recoveries	243		—		5,591		12		967		1,656		11		334		252		9,066
Net charge-offs (recoveries)	4,062		—		(4,862)		(12)		(967)		(1,602)		237		(233)		959		(2,418)
Provision (recovery of provision)	6,812		(607)		(6,638)		1,387		(4,407)		869		6,496		987		967		5,866
Balance, end of year	$	17,385	$	6,610	$	16,858	$	8,965	$	37,653	$	26,510	$	23,690	$	7,698	$	2,183	$	147,552
2022
Balance, beginning of year	$	15,409	$	6,585	$	19,624	$	6,015	$	33,628	$	19,673	$	19,691	$	5,084	$	1,783	$	127,492
Charge-offs	625		—		118		—		—		1,114		538		284		730		3,409
Recoveries	56		—		417		—		785		17		45		160		460		1,940
Net charge-offs (recoveries)	569		—		(299)		—		(785)		1,097		493		124		270		1,469
Provision (recovery of provision)	(205)		632		(1,289)		1,551		6,680		5,463		(1,767)		1,518		662		13,245
Balance, end of year	$	14,635	$	7,217	$	18,634	$	7,566	$	41,093	$	24,039	$	17,431	$	6,478	$	2,175	$	139,268
2021
Balance, beginning of year	$	16,680	$	5,549	$	28,926	$	6,400	$	34,053	$	19,166	$	22,758	$	5,374	$	1,748	$	140,654
Charge-offs	2,930		—		7,797		—		—		856		—		228		712		12,523
Recoveries	812		—		1,316		—		687		473		19		16		341		3,664
Net charge-offs (recoveries)	2,118		—		6,481		—		(687)		383		(19)		212		371		8,859
Provision (recovery of provision)	847		1,036		(2,821)		(385)		(1,112)		890		(3,086)		(78)		406		(4,303)
Balance, end of year	$	15,409	$	6,585	$	19,624	$	6,015	$	33,628	$	19,673	$	19,691	$	5,084	$	1,783	$	127,492

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)	2023		2022		2021
Balance, beginning of year	$	5,616	$	4,196	$	4,499
Provision (recovery of provision)	2,566		1,420		(303)
Balance, end of year	$	8,182	$	5,616	$	4,196