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Reserve for Loan and Lease Losses (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Reserve for loan and lease losses        
Number of classes existing in loan and lease portfolio | item     8  
Changes in reserve for loan and lease losses        
Balance at the beginning of the period $ 94,883 $ 88,543    
Charge-offs 556 1,558    
Recoveries 218 2,133    
Net charge-offs (recoveries) 338 (575)    
Provision (recovery of provision) 3,786 1,000    
Balance at the end of the period 98,331 90,118    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     $ 1,197 $ 666
Ending balance, collectively evaluated for impairment     97,134 94,217
Total reserve for loan and lease losses 94,883 88,543 98,331 94,883
Recorded investment in loans        
Ending balance, individually evaluated for impairment     23,091 17,117
Ending balance, collectively evaluated for impairment     4,668,006 4,510,561
Total loans and leases     4,691,097 4,527,678
Commercial and agricultural        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 16,228 14,668    
Charge-offs 25 208    
Recoveries 49 595    
Net charge-offs (recoveries) (24) (387)    
Provision (recovery of provision) 1,357 934    
Balance at the end of the period 17,609 15,989    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     0 0
Ending balance, collectively evaluated for impairment     17,609 16,228
Total reserve for loan and lease losses 16,228 14,668 17,609 16,228
Recorded investment in loans        
Ending balance, individually evaluated for impairment     3,013 2,439
Ending balance, collectively evaluated for impairment     1,008,687 927,558
Total loans and leases     1,011,700 929,997
Auto and light truck        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 10,103 8,064    
Charge-offs 316 21    
Recoveries 6 1,127    
Net charge-offs (recoveries) 310 (1,106)    
Provision (recovery of provision) 1,017 602    
Balance at the end of the period 10,810 9,772    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     360 243
Ending balance, collectively evaluated for impairment     10,450 9,860
Total reserve for loan and lease losses 10,103 8,064 10,810 10,103
Recorded investment in loans        
Ending balance, individually evaluated for impairment     8,885 7,780
Ending balance, collectively evaluated for impairment     502,166 489,036
Total loans and leases     511,051 496,816
Medium and heavy duty truck        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 4,844 4,740    
Charge-offs 0 0    
Recoveries 0 0    
Net charge-offs (recoveries) 0 0    
Provision (recovery of provision) (351) (64)    
Balance at the end of the period 4,493 4,676    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     0 0
Ending balance, collectively evaluated for impairment     4,493 4,844
Total reserve for loan and lease losses 4,844 4,740 4,493 4,844
Recorded investment in loans        
Ending balance, individually evaluated for impairment     337 371
Ending balance, collectively evaluated for impairment     279,673 296,564
Total loans and leases     280,010 296,935
Aircraft        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 34,619 34,352    
Charge-offs 29 1,103    
Recoveries 44 183    
Net charge-offs (recoveries) (15) 920    
Provision (recovery of provision) 202 (1,424)    
Balance at the end of the period 34,836 32,008    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     431 0
Ending balance, collectively evaluated for impairment     34,405 34,619
Total reserve for loan and lease losses 34,619 34,352 34,836 34,619
Recorded investment in loans        
Ending balance, individually evaluated for impairment     5,752 1,901
Ending balance, collectively evaluated for impairment     862,667 842,756
Total loans and leases     868,419 844,657
Construction equipment        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 9,343 8,207    
Charge-offs 5 0    
Recoveries 19 22    
Net charge-offs (recoveries) (14) (22)    
Provision (recovery of provision) 1,560 703    
Balance at the end of the period 10,917 8,932    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     101 108
Ending balance, collectively evaluated for impairment     10,816 9,235
Total reserve for loan and lease losses 9,343 8,207 10,917 9,343
Recorded investment in loans        
Ending balance, individually evaluated for impairment     945 928
Ending balance, collectively evaluated for impairment     618,274 562,509
Total loans and leases     619,219 563,437
Commercial real estate        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 14,792 13,677    
Charge-offs 7 2    
Recoveries 21 50    
Net charge-offs (recoveries) (14) (48)    
Provision (recovery of provision) (36) 143    
Balance at the end of the period 14,770 13,868    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     173 181
Ending balance, collectively evaluated for impairment     14,597 14,611
Total reserve for loan and lease losses 14,792 13,677 14,770 14,792
Recorded investment in loans        
Ending balance, individually evaluated for impairment     3,809 3,346
Ending balance, collectively evaluated for impairment     745,117 738,222
Total loans and leases     748,926 741,568
Residential real estate and home equity        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 3,666 3,550    
Charge-offs 11 4    
Recoveries 6 71    
Net charge-offs (recoveries) 5 (67)    
Provision (recovery of provision) (96) (25)    
Balance at the end of the period 3,565 3,592    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     132 134
Ending balance, collectively evaluated for impairment     3,433 3,532
Total reserve for loan and lease losses 3,666 3,550 3,565 3,666
Recorded investment in loans        
Ending balance, individually evaluated for impairment     350 352
Ending balance, collectively evaluated for impairment     517,780 525,770
Total loans and leases     518,130 526,122
Consumer        
Changes in reserve for loan and lease losses        
Balance at the beginning of the period 1,288 1,285    
Charge-offs 163 220    
Recoveries 73 85    
Net charge-offs (recoveries) 90 135    
Provision (recovery of provision) 133 131    
Balance at the end of the period 1,331 1,281    
Reserve for loan and lease losses        
Ending balance, individually evaluated for impairment     0 0
Ending balance, collectively evaluated for impairment     1,331 1,288
Total reserve for loan and lease losses $ 1,288 $ 1,285 1,331 1,288
Recorded investment in loans        
Ending balance, individually evaluated for impairment     0 0
Ending balance, collectively evaluated for impairment     133,642 128,146
Total loans and leases     $ 133,642 $ 128,146