Investment Securities (Securities With A Continuous Unrealized Losses Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 130,579	$ 271,470
Less than 12 months, Unrealized Loss	(2,722)	(3,280)
12 months or more, Fair Value	9,223	93,762
12 months or more, Unrealized Loss	(168)	(5,079)
Total, Fair Value	139,802	365,232
Total, Unrealized Loss	(2,890)	(8,359)
State And Municipals [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	7,665	102,882
Less than 12 months, Unrealized Loss	(41)	(1,639)
12 months or more, Fair Value	5,095	62,995
12 months or more, Unrealized Loss	(146)	(3,778)
Total, Fair Value	12,760	165,877
Total, Unrealized Loss	(187)	(5,417)
Pass-Through Mortgage Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		38,421
Less than 12 months, Unrealized Loss		(142)
12 months or more, Fair Value	4,128	23,425
12 months or more, Unrealized Loss	(22)	(1,027)
Total, Fair Value	4,128	61,846
Total, Unrealized Loss	(22)	(1,169)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	6,489	32,577
Less than 12 months, Unrealized Loss	(106)	(89)
12 months or more, Fair Value		7,342
12 months or more, Unrealized Loss		(274)
Total, Fair Value	6,489	39,919
Total, Unrealized Loss	(106)	(363)
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	116,425	97,590
Less than 12 months, Unrealized Loss	(2,575)	(1,410)
Total, Fair Value	116,425	97,590
Total, Unrealized Loss	$ (2,575)	$ (1,410)