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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Held to Maturity    
Amortized cost $ 191,753 $ 217,668
Gross unrealized gains 106 92
Gross unrealized losses (2,658) (3,394)
Held to maturity, fair value 189,201 214,366
Available for Sale    
Amortized cost 1,307,427 1,246,728
Gross unrealized gains 8,597 9,784
Gross unrealized losses (11,133) (12,665)
Available-for-sale, at fair value 1,304,891 1,243,847
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Held to Maturity    
Amortized cost   124,082
Residential-U.S. Government sponsored entities    
Held to Maturity    
Amortized cost 100,279  
Gross unrealized gains 106 92
Gross unrealized losses (2,222) (2,474)
Held to maturity, fair value 98,163 121,700
Available for Sale    
Amortized cost 808,242 775,803
Gross unrealized gains 2,230 3,698
Gross unrealized losses (9,789) (9,515)
Available-for-sale, at fair value 800,683 769,986
Mortgage Backed Securities Commercial U S Government Sponsored Entities [Member]    
Held to Maturity    
Amortized cost   93,586
Commercial-U.S. Government sponsored entities    
Held to Maturity    
Amortized cost 91,474  
Gross unrealized gains 0 0
Gross unrealized losses (436) (920)
Held to maturity, fair value 91,038 92,666
Available for Sale    
Amortized cost 135,058 135,248
Gross unrealized gains 2,461 2,387
Gross unrealized losses (193) (411)
Available-for-sale, at fair value 137,326 137,224
States and political subdivisions    
Available for Sale    
Amortized cost 178,459 184,836
Gross unrealized gains 2,041 2,002
Gross unrealized losses (719) (1,797)
Available-for-sale, at fair value 179,781 185,041
Corporate securities    
Available for Sale    
Amortized cost 73,772 98,596
Gross unrealized gains 582 974
Gross unrealized losses (76) (181)
Available-for-sale, at fair value 74,278 99,389
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 25,519  
Gross unrealized gains 60  
Gross unrealized losses (69)  
Available-for-sale, at fair value 25,510  
Residential - Non-government sponsored entities    
Available for Sale    
Amortized cost 45,679 51,681
Gross unrealized gains 1,084 627
Gross unrealized losses 0 (761)
Available-for-sale, at fair value 46,763 51,547
Commercial-U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 40,012  
Gross unrealized gains 0  
Gross unrealized losses (287)  
Available-for-sale, at fair value 39,725  
Other    
Available for Sale    
Amortized cost 686 564
Gross unrealized gains 139 96
Gross unrealized losses 0 0
Available-for-sale, at fair value $ 825 $ 660