Other Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Other Investment Not Readily Marketable [Line Items]
Cash surrender value of BOLI	$ 199,962	$ 199,029
LIHTC investments	181,077	75,149
Operating lease ROU assets, net	124,897	129,301
Interest receivable	78,253	81,479
CRA investments	66,713	65,152
Prepaid expenses	20,602	17,099
Taxes receivable	17,656	31,591
Equity investments without readily determinable fair values	14,914	14,890
Equity warrants	4,290	3,434
Equity investments with readily determinable fair values	2,471	2,998
Other receivables/assets	23,106	16,689
Total other assets	733,941	636,811
Increase of investment in low income housing project partnerships	101,000
Community Reinvestment Act Investments
Other Investment Not Readily Marketable [Line Items]
Equity investments without readily determinable fair values	$ 19,200	$ 17,800