Investment Securities (Available-for-sale And Held-to-maturity Securities, Continuous Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	62	123
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 242,978	$ 259,287
12 months or longer, Fair Value	89,326	155,022
Total, Fair Value	332,304	414,309
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(6,396)	(647)
12 months or longer, Unrealized losses	(4,581)	(1,519)
Total, Unrealized losses	$ (10,977)	$ (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	$ 538	$ 12,214
12 months or longer, Fair Value	6,043	3,986
Total, Fair Value	6,581	16,200
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(2)	(44)
12 months or longer, Unrealized losses	(138)	(133)
Total, Unrealized losses	$ (140)	$ (177)
Asset-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	34	28
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 168,437	$ 115,909
12 months or longer, Fair Value	55,437	56,427
Total, Fair Value	223,874	172,336
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(1,293)	(275)
12 months or longer, Unrealized losses	(517)	(260)
Total, Unrealized losses	$ (1,810)	$ (535)
Residential Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	11	64
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 5,101	$ 58,682
12 months or longer, Fair Value	8,042	73,311
Total, Fair Value	13,143	131,993
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(42)	(114)
12 months or longer, Unrealized losses	(64)	(987)
Total, Unrealized losses	$ (106)	$ (1,101)
Collateralized Mortgage Obligation Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	8	22
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 7,225	$ 37,387
12 months or longer, Fair Value	3,626	18,136
Total, Fair Value	10,851	55,523
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(36)	(85)
12 months or longer, Unrealized losses	(1)	(123)
Total, Unrealized losses	$ (37)	$ (208)
Commercial Mortgage-backed Securities [Member]
Available-for-sale, continuous unrealized loss position [Abstract]
Number of securities | security	4	4
Available-for-sale, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months, Fair Value	$ 61,677	$ 35,095
12 months or longer, Fair Value	10,021	3,162
Total, Fair Value	71,698	38,257
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
Less than 12 months, Unrealized losses	(5,023)	(129)
12 months or longer, Unrealized losses	(17)	(16)
Total, Unrealized losses	$ (5,040)	$ (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	$ 6,157
Total, Fair Value	6,157
Available-for-sale, continuous unrealized loss position, Unrealized losses [Abstract]
12 months or longer, Unrealized losses	(3,844)
Total, Unrealized losses	$ (3,844)
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)