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Fair Value Measurements (Details 4)
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Valuation Methodology    
Investment securities, available-for-sale $ 990,129 $ 904,033
Level 3    
Valuation Methodology    
Investment securities, available-for-sale 1,025 2,865
Recurring | Level 3    
Valuation Methodology    
Investment securities, available-for-sale 1,025 2,865
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities    
Valuation Methodology    
Investment securities, available-for-sale $ 1,025 2,155
Recurring | Level 3 | Discounted cash flows | Foreign government    
Valuation Methodology    
Investment securities, available-for-sale   $ 710
Discount for lack of marketability | Non-recurring | Level 3 | Trade publications | Aircraft    
Unobservable Inputs    
Discount rate (as a percent) 0.10  
Discount for lack of marketability | Non-recurring | Level 3 | Auction values | Autos    
Unobservable Inputs    
Discount rate (as a percent) 0.10  
Discount for lack of marketability | Non-recurring | Level 3 | Trade publications and auction values | Medium and heavy duty trucks    
Unobservable Inputs    
Discount rate (as a percent) 0.15  
Discount for lack of marketability | Non-recurring | Level 3 | Trade publications and auction values | Construction equipment    
Unobservable Inputs    
Discount rate (as a percent) 0.20  
Discount for lack of marketability | Non-recurring | Level 3 | Appraisals | Real estate    
Unobservable Inputs    
Discount rate (as a percent) 0.20  
Credit spread assumption | Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Minimum    
Unobservable Inputs    
Debt securities available-for-sale unobservable inputs (as a percent) 0.0017 0.0221
Credit spread assumption | Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Maximum    
Unobservable Inputs    
Debt securities available-for-sale unobservable inputs (as a percent) 0.0302 0.0293
Market yield assumption | Recurring | Level 3 | Discounted cash flows | Foreign government | Minimum    
Unobservable Inputs    
Debt securities available-for-sale unobservable inputs (as a percent)   0.0035
Market yield assumption | Recurring | Level 3 | Discounted cash flows | Foreign government | Maximum    
Unobservable Inputs    
Debt securities available-for-sale unobservable inputs (as a percent)   0.0123
Receivables | Discount for lack of marketability | Non-recurring | Level 3 | Commercial loans    
Unobservable Inputs    
Discount rate (as a percent) 0.20  
Inventory | Discount for lack of marketability | Non-recurring | Level 3 | Minimum | Commercial loans    
Unobservable Inputs    
Discount rate (as a percent) 0.40  
Inventory | Discount for lack of marketability | Non-recurring | Level 3 | Maximum | Commercial loans    
Unobservable Inputs    
Discount rate (as a percent) 0.75