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Reserve for Loan and Lease Losses (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
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 $ 89,296 $ 85,098 $ 88,112 $ 85,068    
Charge-offs 331 220 895 1,421    
Recoveries 444 899 1,217 1,773    
Net charge-offs (recoveries) (113) (679) (322) (352)    
Provision (recovery of provision) 2,049 811 3,024 1,168    
Balance at the end of the period 91,458 86,588 91,458 86,588    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         $ 1,904 $ 797
Ending balance, collectively evaluated for impairment         89,554 87,315
Total reserve for loan and lease losses 89,296 85,098 88,112 85,068 91,458 88,112
Recorded investment in loans            
Ending balance, individually evaluated for impairment         9,945 17,683
Ending balance, collectively evaluated for impairment         4,142,818 3,977,009
Total loans and leases         4,152,763 3,994,692
Commercial and agricultural            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 14,735 11,620 15,456 11,760    
Charge-offs 16 22 216 965    
Recoveries 109 86 200 564    
Net charge-offs (recoveries) (93) (64) 16 401    
Provision (recovery of provision) 7 181 (605) 506    
Balance at the end of the period 14,835 11,865 14,835 11,865    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         463 649
Ending balance, collectively evaluated for impairment         14,372 14,807
Total reserve for loan and lease losses 14,735 11,620 15,456 11,760 14,835 15,456
Recorded investment in loans            
Ending balance, individually evaluated for impairment         3,184 3,900
Ending balance, collectively evaluated for impairment         755,991 740,849
Total loans and leases         759,175 744,749
Auto and light truck            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 9,582 10,793 9,269 10,326    
Charge-offs 0 0 3 22    
Recoveries 64 191 126 251    
Net charge-offs (recoveries) (64) (191) (123) (229)    
Provision (recovery of provision) 2,021 461 2,275 890    
Balance at the end of the period 11,667 11,445 11,667 11,445    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         11,667 9,269
Total reserve for loan and lease losses 9,582 10,793 9,269 10,326 11,667 9,269
Recorded investment in loans            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         457,586 425,236
Total loans and leases         457,586 425,236
Medium and heavy duty truck            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 4,511 4,364 4,699 4,500    
Charge-offs 0 0 0 0    
Recoveries 2 2 10 5    
Net charge-offs (recoveries) (2) (2) (10) (5)    
Provision (recovery of provision) (163) (33) (359) (172)    
Balance at the end of the period 4,350 4,333 4,350 4,333    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         4,350 4,699
Total reserve for loan and lease losses 4,511 4,364 4,699 4,500 4,350 4,699
Recorded investment in loans            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         273,674 278,254
Total loans and leases         273,674 278,254
Aircraft            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 34,240 31,301 32,373 32,234    
Charge-offs 0 0 0 49    
Recoveries 89 398 227 442    
Net charge-offs (recoveries) (89) (398) (227) (393)    
Provision (recovery of provision) 332 1,141 2,061 213    
Balance at the end of the period 34,661 32,840 34,661 32,840    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         1,296 0
Ending balance, collectively evaluated for impairment         33,365 32,373
Total reserve for loan and lease losses 34,240 31,301 32,373 32,234 34,661 32,373
Recorded investment in loans            
Ending balance, individually evaluated for impairment         4,280 4,384
Ending balance, collectively evaluated for impairment         818,562 773,628
Total loans and leases         822,842 778,012
Construction equipment            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 7,462 7,740 7,592 7,008    
Charge-offs 0 0 92 0    
Recoveries 70 123 148 245    
Net charge-offs (recoveries) (70) (123) (56) (245)    
Provision (recovery of provision) (20) (56) (136) 554    
Balance at the end of the period 7,512 7,807 7,512 7,807    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         7,512 7,592
Total reserve for loan and lease losses 7,462 7,740 7,592 7,008 7,512 7,592
Recorded investment in loans            
Ending balance, individually evaluated for impairment         577 539
Ending balance, collectively evaluated for impairment         483,777 455,026
Total loans and leases         484,354 455,565
Commercial real estate            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 13,835 13,186 13,762 13,270    
Charge-offs 0 0 1 0    
Recoveries 34 38 339 135    
Net charge-offs (recoveries) (34) (38) (338) (135)    
Provision (recovery of provision) (407) 2 (638) (179)    
Balance at the end of the period 13,462 13,226 13,462 13,226    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         13,462 13,762
Total reserve for loan and lease losses 13,835 13,186 13,762 13,270 13,462 13,762
Recorded investment in loans            
Ending balance, individually evaluated for impairment         1,541 8,494
Ending balance, collectively evaluated for impairment         714,391 691,774
Total loans and leases         715,932 700,268
Residential real estate and home equity            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 3,379 4,115 3,382 4,102    
Charge-offs 58 25 81 65    
Recoveries 4 5 6 7    
Net charge-offs (recoveries) 54 20 75 58    
Provision (recovery of provision) 52 (651) 70 (600)    
Balance at the end of the period 3,377 3,444 3,377 3,444    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         145 148
Ending balance, collectively evaluated for impairment         3,232 3,234
Total reserve for loan and lease losses 3,379 4,115 3,382 4,102 3,377 3,382
Recorded investment in loans            
Ending balance, individually evaluated for impairment         363 366
Ending balance, collectively evaluated for impairment         482,616 463,763
Total loans and leases         482,979 464,129
Consumer            
Changes in reserve for loan and lease losses            
Balance at the beginning of the period 1,552 1,979 1,579 1,868    
Charge-offs 257 173 502 320    
Recoveries 72 56 161 124    
Net charge-offs (recoveries) 185 117 341 196    
Provision (recovery of provision) 227 (234) 356 (44)    
Balance at the end of the period 1,594 1,628 1,594 1,628    
Reserve for loan and lease losses            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         1,594 1,579
Total reserve for loan and lease losses $ 1,552 $ 1,979 $ 1,579 $ 1,868 1,594 1,579
Recorded investment in loans            
Ending balance, individually evaluated for impairment         0 0
Ending balance, collectively evaluated for impairment         156,221 148,479
Total loans and leases         $ 156,221 $ 148,479