Acquisitions (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Merger-related expense		$ 0	$ 353	$ 0	$ 57,493
Earnout liabilities, fair value						$ 11,016
FCB Financial Holdings, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 1,630,000
Loans	9,290,000	90,300		90,300
Deposits	$ 10,930,000
Merger-related expense			$ 400		$ 57,500
Global One
Business Acquisition [Line Items]
Increase in earnout liabilities				4,900
Earnout liabilities, fair value		$ 15,900		$ 15,900