Investment Securities (Securities With A Continuous Unrealized Losses Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 117,730	$ 271,470
Less than 12 months, Unrealized Loss	(1,270)	(3,280)
12 months or more, Fair Value	95,781	93,762
12 months or more, Unrealized Loss	(2,513)	(5,079)
Total, Fair Value	213,511	365,232
Total, Unrealized Loss	(3,783)	(8,359)
State And Municipals [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		102,882
Less than 12 months, Unrealized Loss		(1,639)
12 months or more, Fair Value	60,339	62,995
12 months or more, Unrealized Loss	(1,792)	(3,778)
Total, Fair Value	60,339	165,877
Total, Unrealized Loss	(1,792)	(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	28,282	23,425
12 months or more, Unrealized Loss	(558)	(1,027)
Total, Fair Value	28,282	61,846
Total, Unrealized Loss	(558)	(1,169)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		32,577
Less than 12 months, Unrealized Loss		(89)
12 months or more, Fair Value	7,160	7,342
12 months or more, Unrealized Loss	(163)	(274)
Total, Fair Value	7,160	39,919
Total, Unrealized Loss	(163)	(363)
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	117,730	97,590
Less than 12 months, Unrealized Loss	(1,270)	(1,410)
Total, Fair Value	117,730	97,590
Total, Unrealized Loss	$ (1,270)	$ (1,410)