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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Item Effected        
Cumulative effect adjustment to retained earnings $ 930,670 $ 848,636 $ 763,590 $ 718,537
Financing Receivable, Allowance for Credit Loss 140,654 111,254 100,469 94,883
Unfunded loan commitments   3,172    
Allowance for credit losses including off-balance sheet credit loss liability   114,426    
Commercial and agricultural        
Item Effected        
Financing Receivable, Allowance for Credit Loss 22,229 23,671 17,063 16,228
Auto and light truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss 28,926 14,400 14,689 10,103
Medium and heavy duty truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss 6,400 4,612 4,303 4,844
Aircraft        
Item Effected        
Financing Receivable, Allowance for Credit Loss   31,058    
Construction equipment        
Item Effected        
Financing Receivable, Allowance for Credit Loss 19,166 14,120 10,922 9,343
Commercial real estate        
Item Effected        
Financing Receivable, Allowance for Credit Loss 22,758 18,350 15,705 14,792
Residential real estate and home equity        
Item Effected        
Financing Receivable, Allowance for Credit Loss 5,374 3,609 3,425 3,666
Consumer        
Item Effected        
Financing Receivable, Allowance for Credit Loss 1,748 1,434 1,315 1,288
Retained Earnings        
Item Effected        
Cumulative effect adjustment to retained earnings $ 514,176 463,269 398,980 339,959
Cumulative Effect, Period of Adoption, Adjustment [Member]        
Item Effected        
Cumulative effect adjustment to retained earnings   (2,552) (301) 0
Financing Receivable, Allowance for Credit Loss   2,584    
Unfunded loan commitments   777    
Allowance for credit losses including off-balance sheet credit loss liability   3,361    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and agricultural        
Item Effected        
Financing Receivable, Allowance for Credit Loss   (655)    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Auto and light truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss   (1,303)    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Medium and heavy duty truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss   2,414    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Aircraft        
Item Effected        
Financing Receivable, Allowance for Credit Loss   484    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Construction equipment        
Item Effected        
Financing Receivable, Allowance for Credit Loss   372    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial real estate        
Item Effected        
Financing Receivable, Allowance for Credit Loss   (649)    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential real estate and home equity        
Item Effected        
Financing Receivable, Allowance for Credit Loss   1,688    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer        
Item Effected        
Financing Receivable, Allowance for Credit Loss   233    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings        
Item Effected        
Cumulative effect adjustment to retained earnings   (2,552) (301) 718
Net deferred tax amount of cumulative effect adjustment to retained earnings   810    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]        
Item Effected        
Cumulative effect adjustment to retained earnings   846,084 763,289 718,537
Financing Receivable, Allowance for Credit Loss   113,838    
Unfunded loan commitments   3,949    
Allowance for credit losses including off-balance sheet credit loss liability   117,787    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial and agricultural        
Item Effected        
Financing Receivable, Allowance for Credit Loss   23,016    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Auto and light truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss   13,097    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Medium and heavy duty truck        
Item Effected        
Financing Receivable, Allowance for Credit Loss   7,026    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Aircraft        
Item Effected        
Financing Receivable, Allowance for Credit Loss   31,542    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Construction equipment        
Item Effected        
Financing Receivable, Allowance for Credit Loss   14,492    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial real estate        
Item Effected        
Financing Receivable, Allowance for Credit Loss   17,701    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Residential real estate and home equity        
Item Effected        
Financing Receivable, Allowance for Credit Loss   5,297    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Consumer        
Item Effected        
Financing Receivable, Allowance for Credit Loss   1,667    
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Retained Earnings        
Item Effected        
Cumulative effect adjustment to retained earnings   $ 460,717 $ 398,679 $ 340,677