Fair Value Measurements (Details 4) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Valuation Methodology
Investment securities, available-for-sale	$ 1,197,467	$ 1,040,583
Level 3
Valuation Methodology
Investment securities, available-for-sale	2,152	2,292
Recurring | Level 3
Valuation Methodology
Investment securities, available-for-sale	2,152	2,292
Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities
Valuation Methodology
Investment securities, available-for-sale	$ 2,152	$ 2,292
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)	0.0004	0.0012
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)	0.0230	0.0285
Credit spread assumption | Recurring | Level 3 | Discounted cash flows | Direct placement municipal securities | Weighted Average [Member]
Unobservable Inputs
Debt securities available-for-sale unobservable inputs (as a percent)	0.0155
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