Loan and Lease Financings (Details 3) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	$ 5,065,615	$ 4,792,847
90 Days or More Past Due and Accruing	313	368
Total Accruing Loans	5,089,358	4,807,605
Nonaccrual	10,188	27,859
Total loans and leases	5,099,546	4,835,464
30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	17,596	11,180
60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	5,834	3,210
Commercial and agricultural
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	1,173,150	1,070,530
Total Accruing Loans	1,174,225	1,070,552
Nonaccrual	1,711	2,653
Total loans and leases	1,175,936	1,073,205
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	63	22
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	1,012	0
Auto and light truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	609,313	544,022
Total Accruing Loans	611,065	548,613
Nonaccrual	1,856	11,374
Total loans and leases	612,921	559,987
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	1,279	3,154
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	473	1,437
Medium and heavy duty truck
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	289,906	283,284
Total Accruing Loans	289,906	283,438
Nonaccrual	19	106
Total loans and leases	289,925	283,544
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	0	154
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	791,611	790,233
Total Accruing Loans	804,497	795,550
Nonaccrual	1,071	7,561
Total loans and leases	805,568	803,111
Aircraft | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	9,825	4,149
Aircraft | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	3,061	1,168
Construction equipment
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	678,017	641,270
Total Accruing Loans	683,931	642,913
Nonaccrual	1,765	2,326
Total loans and leases	685,696	645,239
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	4,800	1,643
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	1,114	0
Commercial real estate
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	856,848	807,793
Total Accruing Loans	856,848	807,902
Nonaccrual	1,554	1,984
Total loans and leases	858,402	809,886
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	109
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	528,261	520,124
90 Days or More Past Due and Accruing	303	295
Total Accruing Loans	529,708	522,141
Nonaccrual	1,922	1,714
Total loans and leases	531,630	523,855
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	1,086	1,267
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	58	455
Consumer
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Current	138,509	135,591
90 Days or More Past Due and Accruing	10	73
Total Accruing Loans	139,178	136,496
Nonaccrual	290	141
Total loans and leases	139,468	136,637
Consumer | 30 to 59 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	543	682
Consumer | 60 to 89 Days Past Due
Recorded investment of loans and leases, segregated by class, with delinquency aging and nonaccrual status
Past Due	$ 116	$ 150