Investment Securities (Securities With A Continuous Unrealized Losses Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 294,141	$ 417,605
Less than 12 months, Unrealized Loss	(4,791)	(8,325)
12 months or more, Fair Value	16,300	7,737
12 months or more, Unrealized Loss	(333)	(205)
Total, Fair Value	310,441	425,342
Total, Unrealized Loss	(5,124)	(8,530)
State And Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	58,324	117,181
Less than 12 months, Unrealized Loss	(1,465)	(3,631)
12 months or more, Fair Value	1,455
12 months or more, Unrealized Loss	(12)
Total, Fair Value	59,779	117,181
Total, Unrealized Loss	(1,477)	(3,631)
Pass-Through Mortgage Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	136,804	175,000
Less than 12 months, Unrealized Loss	(2,200)	(2,874)
12 months or more, Fair Value	8,225
12 months or more, Unrealized Loss	(147)
Total, Fair Value	145,029	175,000
Total, Unrealized Loss	(2,347)	(2,874)
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	99,013	125,424
Less than 12 months, Unrealized Loss	(1,126)	(1,820)
12 months or more, Fair Value	6,620	7,737
12 months or more, Unrealized Loss	(174)	(205)
Total, Fair Value	105,633	133,161
Total, Unrealized Loss	$ (1,300)	$ (2,025)