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SECURITIES (Amortized Cost And Estimated Fair Values Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost $ 2,353,292 $ 2,353,292 $ 2,521,592 $ 2,436,449
Gross Unrealized Gains 17,264 17,264 21,407 34,947
Gross Unrealized Losses 10,589 10,589 11,323 3,197
Estimated Fair Value 2,359,967 2,359,967 2,531,676 2,468,199
Carrying value of FHLB stock 32,600 32,600    
Required investment in FHLB stock 27,600 27,600    
Gross gains recognized on available-for-sale securities 1,100 89    
US Government Agencies [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 1,693,102 1,693,102 1,794,231 1,686,637
Gross Unrealized Gains 268 268 1,261 5,330
Gross Unrealized Losses 6,184 6,184 6,065 101
Estimated Fair Value 1,687,186 1,687,186 1,789,427 1,691,866
U.S. Government Agency Issued Residential Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 157,868 157,868 176,476 181,307
Gross Unrealized Gains 1,288 1,288 1,665 2,887
Gross Unrealized Losses 1,265 1,265 1,898 99
Estimated Fair Value 157,891 157,891 176,243 184,095
U.S. Government Agency Issued Commercial Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 153,157 153,157 171,840 175,078
Gross Unrealized Gains 1,400 1,400 1,648 3,831
Gross Unrealized Losses 1,048 1,048 1,209 82
Estimated Fair Value 153,509 153,509 172,279 178,827
Obligations Of States And Political Subdivisions [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 316,374 316,374 346,609 366,039
Gross Unrealized Gains 14,032 14,032 15,547 21,871
Gross Unrealized Losses 2,092 2,092 2,151 2,915
Estimated Fair Value 328,314 328,314 360,005 384,995
FHLB and other securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 32,791 32,791 32,436 27,388
Gross Unrealized Gains 276 276 1,286 1,028
Estimated Fair Value $ 33,067 $ 33,067 $ 33,722 $ 28,416