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SECURITIES (Securities with Continuous Loss Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 1,034,409 $ 617,847
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (25,217) (5,686)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 328,897 151,971
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (14,687) (2,877)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,363,306 769,818
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (39,904) (8,563)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 103,771 59,862
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,708 549
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 50,207 38,748
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3,348) (1,221)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 153,978 98,610
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 6,056 1,770
U.S. Government and agency obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 101,146 31,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,940) (211)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 27,397 23,341
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,090) (220)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 128,543 54,617
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (3,030) (431)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 143  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 143  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 4  
Municipal bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 25,768 20,879
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (358) (185)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 20,470 13,360
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (662) (260)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 46,238 34,239
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (1,020) (445)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 59,854 21,839
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,227 171
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 33,614 34,314
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,546) (1,081)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 93,468 56,153
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 3,773 1,252
Corporate bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,837 296
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (11) (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 293 4,682
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7) (40)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,130 4,978
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (18) (44)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 481  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 20  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 0  
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 481  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 20  
Mortgage-backed or related securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 902,556 559,916
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (22,907) (5,138)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 270,846 100,662
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (12,808) (2,264)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,173,402 660,578
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (35,715) (7,402)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 43,293 38,023
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,457 378
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 16,593 4,434
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (802) (140)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 59,886 42,457
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 2,259 518
Asset-backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1,102 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 9,891 9,926
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (120) (93)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 10,993 9,926
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (121) (93)
Equity Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value   5,480
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (148)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   5,480
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss   $ (148)