SECURITIES (Temporarily Impaired Available-For-Sale Securities With Continuous Unrealized Loss Positions) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 36,477	$ 1,004,003
12 Months or Longer, Fair Value	5,349	34,022
Total, Fair Value	41,826	1,038,025
Less Than 12 Months, Unrealized Losses	95	5,403
12 Months or Longer, Unrealized Losses	9	568
Total, Unrealized Losses	104	5,971
US Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		762,568
Total, Fair Value		762,568
Less Than 12 Months, Unrealized Losses		2,447
Total, Unrealized Losses		2,447
Government Agency Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	21,771	34,238
12 Months or Longer, Fair Value	4,691
Total, Fair Value	26,462	34,238
Less Than 12 Months, Unrealized Losses	76	176
12 Months or Longer, Unrealized Losses	7
Total, Unrealized Losses	83	176
Government Agency Issued Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	14,049	193,621
12 Months or Longer, Fair Value	658	31,166
Total, Fair Value	14,707	224,787
Less Than 12 Months, Unrealized Losses	13	2,710
12 Months or Longer, Unrealized Losses	2	555
Total, Unrealized Losses	15	3,265
Obligations Of States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	657	13,576
12 Months or Longer, Fair Value		2,856
Total, Fair Value	657	16,432
Less Than 12 Months, Unrealized Losses	6	70
12 Months or Longer, Unrealized Losses		13
Total, Unrealized Losses	$ 6	$ 83