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Allowance for Credit Losses (Tables) | 12 Months Ended
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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 |

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