Loan and Lease Financings (Details 2) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	$ 5,458,032	$ 5,424,982
90 Days or More Past Due and Accruing	67	115
Total Accruing Loans	5,464,572	5,428,913
Nonaccrual	58,513	60,388
Total loans and leases	5,523,085	5,489,301
Accrued interest receivable on loans and leases	16,390	16,390
30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	2,419	2,973
60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	4,054	843
Commercial and agricultural
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	1,233,324	1,180,151
Total Accruing Loans	1,233,482	1,180,185
Nonaccrual	5,226	5,933
Total loans and leases	1,238,708	1,186,118
Commercial and agricultural | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	9	34
Commercial and agricultural | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	149	0
Solar
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	296,124	292,604
Total Accruing Loans	296,124	292,604
Nonaccrual	0	0
Total loans and leases	296,124	292,604
Solar | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Solar | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Auto and light truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	514,136	504,659
Total Accruing Loans	514,681	505,424
Nonaccrual	37,995	36,945
Total loans and leases	552,676	542,369
Auto and light truck | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	350	560
Auto and light truck | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	195	205
Medium and heavy duty truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	268,009	278,452
Total Accruing Loans	268,020	278,452
Nonaccrual	616	720
Total loans and leases	268,636	279,172
Medium and heavy duty truck | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	11	0
Medium and heavy duty truck | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Aircraft
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	869,618	860,632
Total Accruing Loans	873,002	860,632
Nonaccrual	768	828
Total loans and leases	873,770	861,460
Aircraft | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Aircraft | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	3,384	0
Construction equipment
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	693,952	701,124
Total Accruing Loans	695,037	702,515
Nonaccrual	10,707	12,373
Total loans and leases	705,744	714,888
Construction equipment | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	1,085	1,093
Construction equipment | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	298
Commercial real estate
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	974,137	968,370
Total Accruing Loans	974,137	968,370
Nonaccrual	1,246	1,494
Total loans and leases	975,383	969,864
Commercial real estate | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Commercial real estate | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	0	0
Residential real estate and home equity
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	483,718	508,532
90 Days or More Past Due and Accruing	59	108
Total Accruing Loans	484,506	509,661
Nonaccrual	1,650	1,718
Total loans and leases	486,156	511,379
Residential real estate and home equity | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	672	782
Residential real estate and home equity | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	57	239
Consumer
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	125,014	130,458
90 Days or More Past Due and Accruing	8	7
Total Accruing Loans	125,583	131,070
Nonaccrual	305	377
Total loans and leases	125,888	131,447
Consumer | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	292	504
Consumer | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	$ 269	$ 101