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SECURITIES - Unrealized Loss on Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value $ 115,902  
Less than 12 months, fair value   $ 614,799
More than 12 Months, fair value 1,345,243  
More than 12 months, fair value   288,113
Total fair value 1,461,145  
Total fair value   902,912
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 Months, unrealized loss 1,247  
Less than 12 months, unrealized loss   3,879
More than 12 Months, unrealized loss 33,356  
More than 12 months, unrealized loss   8,496
Total unrealized loss 34,603  
Total unrealized loss   12,375
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 5,460 246,806
More than 12 months, fair value 142,236 73,024
Total fair value 147,696 319,830
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Less than 12 Months, unrealized loss position 63 1,746
More than 12 Months, unrealized loss position 3,447 2,282
Unrealized loss position 3,510 4,028
State and Political Subdivisions    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 98,112  
Less than 12 months, fair value   32,341
More than 12 Months, fair value 399,205  
More than 12 months, fair value   172,006
Total fair value 497,317  
Total fair value   204,347
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 Months, unrealized loss 899  
Less than 12 months, unrealized loss   121
More than 12 Months, unrealized loss 16,757  
More than 12 months, unrealized loss   3,870
Total unrealized loss 17,656  
Total unrealized loss   3,991
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 235 85,608
More than 12 months, fair value 2,022 56,736
Total fair value 2,257 142,344
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Less than 12 Months, unrealized loss position 1 807
More than 12 Months, unrealized loss position 41 1,776
Unrealized loss position 42 2,583
Other Stocks and Bonds    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 2,709  
More than 12 Months, fair value 0  
Total fair value 2,709  
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 Months, unrealized loss 291  
More than 12 Months, unrealized loss 0  
Total unrealized loss 291  
Other Equity Securities    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 months, fair value [1]   5,920
More than 12 months, fair value [1]   0
Total fair value [1]   5,920
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 months, unrealized loss [1]   107
More than 12 months, unrealized loss [1]   0
Total unrealized loss [1]   107
Residential    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 5,552  
Less than 12 months, fair value   429,742
More than 12 Months, fair value 488,334  
More than 12 months, fair value   102,973
Total fair value 493,886  
Total fair value   532,715
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 Months, unrealized loss 27  
Less than 12 months, unrealized loss   3,232
More than 12 Months, unrealized loss 9,084  
More than 12 months, unrealized loss   4,145
Total unrealized loss 9,111  
Total unrealized loss   7,377
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 4,826 24,707
More than 12 months, fair value 51,046 2,736
Total fair value 55,872 27,443
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Less than 12 Months, unrealized loss position 60 157
More than 12 Months, unrealized loss position 1,080 82
Unrealized loss position 1,140 239
Commercial    
Available-for-sale, Unrealized Loss Position [Abstract]    
Less than 12 Months, fair value 9,529  
Less than 12 months, fair value   146,796
More than 12 Months, fair value 457,704  
More than 12 months, fair value   13,134
Total fair value 467,233  
Total fair value   159,930
Available-for-sale Securities, Unrealized Loss Position, Accumulated Loss)    
Less than 12 Months, unrealized loss 30  
Less than 12 months, unrealized loss   419
More than 12 Months, unrealized loss 7,515  
More than 12 months, unrealized loss   481
Total unrealized loss 7,545  
Total unrealized loss   900
Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, fair value 399 136,491
More than 12 months, fair value 89,168 13,552
Total fair value 89,567 150,043
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Less than 12 Months, unrealized loss position 2 782
More than 12 Months, unrealized loss position 2,326 424
Unrealized loss position $ 2,328 $ 1,206
[1] See “Note 1 – Summary of Significant Accounting and Reporting Policies” for further information.