Loans Receivable and Allowance for Credit Losses (Loans Receivable Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Nonaccrual loans
Loans on nonaccrual status	$ 126,668
Foreclosed assets
Foreclosed assets	24,300	$ 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	$ 8,100	7,200
PCI Loans
Nonaccrual loans
Loans on nonaccrual status		$ 297