Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details) $ in Thousands	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	68	123
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 289,447	$ 259,287
12 months or longer, Fair Value	69,916	155,022
Total, Fair Value	359,363	414,309
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(7,709)	(647)
12 months or longer, Unrealized losses	(5,226)	(1,519)
Total, Unrealized losses	$ (12,935)	$ (2,166)
Held-to-maturity, continuous unrealized loss position [Abstract]
Number of securities | security		1
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value		$ 7,152
Total, Fair Value		7,152
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses		(2,067)
Total, Unrealized losses		$ (2,067)
U.S. Government Agency Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	4	5
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 3,025	$ 12,214
12 months or longer, Fair Value	3,732	3,986
Total, Fair Value	6,757	16,200
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(18)	(44)
12 months or longer, Unrealized losses	(127)	(133)
Total, Unrealized losses	$ (145)	$ (177)
Asset-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	40	28
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 197,851	$ 115,909
12 months or longer, Fair Value	37,346	56,427
Total, Fair Value	235,197	172,336
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(4,971)	(275)
12 months or longer, Unrealized losses	(1,108)	(260)
Total, Unrealized losses	$ (6,079)	$ (535)
Residential Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	10	64
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 3,856	$ 58,682
12 months or longer, Fair Value	8,833	73,311
Total, Fair Value	12,689	131,993
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(45)	(114)
12 months or longer, Unrealized losses	(78)	(987)
Total, Unrealized losses	$ (123)	$ (1,101)
Collateralized Mortgage Obligation Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	10	22
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 23,192	$ 37,387
12 months or longer, Fair Value	3,779	18,136
Total, Fair Value	26,971	55,523
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(73)	(85)
12 months or longer, Unrealized losses	(17)	(123)
Total, Unrealized losses	$ (90)	$ (208)
Commercial Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	3	4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 61,523	$ 35,095
12 months or longer, Fair Value	10,062	3,162
Total, Fair Value	71,585	38,257
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(2,602)	(129)
12 months or longer, Unrealized losses	(60)	(16)
Total, Unrealized losses	$ (2,662)	$ (145)
Corporate Debt Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	1
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value	$ 6,164
Total, Fair Value	6,164
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses	(3,836)
Total, Unrealized losses	$ (3,836)
Single Issuers [Member]
Held-to-maturity, continuous unrealized loss position [Abstract]
Number of securities | security		1
Held-to-maturity, continuous unrealized loss position, Fair Value [Abstract]
12 months or longer, Fair Value		$ 7,152
Total, Fair Value		7,152
Held-to-maturity, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses		(2,067)
Total, Unrealized losses		$ (2,067)