Securities (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Dec. 31, 2019 security
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	96		96		101
Provision for credit losses | $	$ 0		$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | $	$ 0		$ 0
Collateralized loan obligations (“CLOs”)
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	3		3		3
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	25		25		57
U.S. government agency and U.S. government-sponsored enterprise debt securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	13		13		14
AFS debt securities
Unrealized Loss
AFS debt securities, accrued interest | $	$ 14,800,000		$ 14,800,000
OTTI credit losses | $		$ 0		$ 0