Loans and Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest receivable	$ 109,400		$ 106,500
Jumbo residential mortgage loans	35,921,614		$ 34,497,464
Impairment charges	224	$ 0
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Jumbo residential mortgage loans	$ 423,000