Loans Receivable and Allowance for Credit Losses (Loans Receivable Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Nonaccrual loans
Loans on nonaccrual status	$ 236,494
Foreclosed assets
Foreclosed assets	23,400	$ 1,300
Residential real estate properties
Foreclosed assets
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	$ 3,500	7,200
PCI Loans
Nonaccrual loans
Loans on nonaccrual status		$ 297