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Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in allowance for loan and lease losses      
Balance at the beginning of the period $ 140,654 $ 111,254 $ 100,469
Charge-offs 12,523 13,974 7,591
Recoveries 3,664 4,789 2,543
Net charge-offs (recoveries) 8,859 9,185 5,048
Provision (recovery of provision) (4,303) 36,001 15,833
Balance at the end of the period 127,492 140,654 111,254
Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   2,584  
Balance at the end of the period     2,584
Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   113,838  
Balance at the end of the period     113,838
Commercial and agricultural      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 16,680 20,926 15,555
Charge-offs 2,930 903 1,040
Recoveries 812 663 664
Net charge-offs (recoveries) 2,118 240 376
Provision (recovery of provision) 847 (3,067) 5,747
Balance at the end of the period 15,409 16,680 20,926
Commercial and agricultural | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   (939)  
Balance at the end of the period     (939)
Commercial and agricultural | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   19,987  
Balance at the end of the period     19,987
Solar      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 5,549 2,745 1,508
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs (recoveries) 0 0 0
Provision (recovery of provision) 1,036 2,520 1,237
Balance at the end of the period 6,585 5,549 2,745
Solar | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   284  
Balance at the end of the period     284
Solar | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   3,029  
Balance at the end of the period     3,029
Auto and light truck      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 28,926 14,400 14,689
Charge-offs 7,797 7,107 991
Recoveries 1,316 499 97
Net charge-offs (recoveries) 6,481 6,608 894
Provision (recovery of provision) (2,821) 22,437 605
Balance at the end of the period 19,624 28,926 14,400
Auto and light truck | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   (1,303)  
Balance at the end of the period     (1,303)
Auto and light truck | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   13,097  
Balance at the end of the period     13,097
Medium and heavy duty truck      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 6,400 4,612 4,303
Charge-offs 0 15 1,132
Recoveries 0 18 32
Net charge-offs (recoveries) 0 (3) 1,100
Provision (recovery of provision) (385) (629) 1,409
Balance at the end of the period 6,015 6,400 4,612
Medium and heavy duty truck | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   2,414  
Balance at the end of the period     2,414
Medium and heavy duty truck | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   7,026  
Balance at the end of the period     7,026
Aircraft      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 34,053 31,058 33,047
Charge-offs 0 855 3,066
Recoveries 687 1,800 1,143
Net charge-offs (recoveries) (687) (945) 1,923
Provision (recovery of provision) (1,112) 1,566 (66)
Balance at the end of the period 33,628 34,053 31,058
Aircraft | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   484  
Balance at the end of the period     484
Aircraft | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   31,542  
Balance at the end of the period     31,542
Construction equipment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 19,166 14,120 10,922
Charge-offs 856 4,090 238
Recoveries 473 1,415 160
Net charge-offs (recoveries) 383 2,675 78
Provision (recovery of provision) 890 7,349 3,276
Balance at the end of the period 19,673 19,166 14,120
Construction equipment | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   372  
Balance at the end of the period     372
Construction equipment | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   14,492  
Balance at the end of the period     14,492
Commercial real estate      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 22,758 18,350 15,705
Charge-offs 0 37 5
Recoveries 19 58 75
Net charge-offs (recoveries) (19) (21) (70)
Provision (recovery of provision) (3,086) 5,036 2,575
Balance at the end of the period 19,691 22,758 18,350
Commercial real estate | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   (649)  
Balance at the end of the period     (649)
Commercial real estate | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   17,701  
Balance at the end of the period     17,701
Residential real estate and home equity      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 5,374 3,609 3,425
Charge-offs 228 74 53
Recoveries 16 33 85
Net charge-offs (recoveries) 212 41 (32)
Provision (recovery of provision) (78) 118 152
Balance at the end of the period 5,084 5,374 3,609
Residential real estate and home equity | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   1,688  
Balance at the end of the period     1,688
Residential real estate and home equity | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   5,297  
Balance at the end of the period     5,297
Consumer      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period 1,748 1,434 1,315
Charge-offs 712 893 1,066
Recoveries 341 303 287
Net charge-offs (recoveries) 371 590 779
Provision (recovery of provision) 406 671 898
Balance at the end of the period $ 1,783 1,748 1,434
Consumer | Adjustment      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   233  
Balance at the end of the period     233
Consumer | Adjusted Balance      
Changes in allowance for loan and lease losses      
Balance at the beginning of the period   $ 1,667  
Balance at the end of the period     $ 1,667