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SECURITIES (Amortized Cost And Estimated Fair Values Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost $ 2,412,533 $ 2,412,533 $ 2,521,592 $ 2,060,962
Gross Unrealized Gains 18,707 18,707 21,407 43,025
Gross Unrealized Losses 9,945 9,945 11,323 104
Estimated Fair Value 2,421,295 2,421,295 2,531,676 2,103,883
Carrying value of FHLB stock 32,500 32,500   19,000
Required investment in FHLB stock 27,600 27,600   19,000
Gross gains recognized on available-for-sale securities 1,100 88    
US Government Agencies [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 1,718,885 1,718,885 1,794,231 1,302,238
Gross Unrealized Gains 433 433 1,261 8,565
Gross Unrealized Losses 5,944 5,944 6,065  
Estimated Fair Value 1,713,374 1,713,374 1,789,427 1,310,803
U.S. Government Agency Issued Residential Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 159,617 159,617 176,476 177,195
Gross Unrealized Gains 1,255 1,255 1,665 3,066
Gross Unrealized Losses 1,626 1,626 1,898 83
Estimated Fair Value 159,246 159,246 176,243 180,178
U.S. Government Agency Issued Commercial Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 170,129 170,129 171,840 188,222
Gross Unrealized Gains 1,557 1,557 1,648 5,268
Gross Unrealized Losses 1,044 1,044 1,209 15
Estimated Fair Value 170,642 170,642 172,279 193,475
Obligations Of States And Political Subdivisions [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 331,251 331,251 346,609 374,134
Gross Unrealized Gains 15,210 15,210 15,547 25,263
Gross Unrealized Losses 1,331 1,331 2,151 6
Estimated Fair Value 345,130 345,130 360,005 399,391
FHLB and other securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized Cost 32,651 32,651 32,436 19,173
Gross Unrealized Gains 252 252 1,286 863
Estimated Fair Value $ 32,903 $ 32,903 $ 33,722 $ 20,036