Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Loan commitments to extend credit	$ 3,580,655	$ 1,921,067
Standby letters of credit	210,292	88,495
Commitments to purchase equipment being acquired for lease to others	6,663	12,839
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 3,797,610	$ 2,022,401