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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Held-to-Maturity:    
Amortized Cost $ 204,588 $ 217,668
Gross unrealized gains 585 92
Gross unrealized losses (1,839) (3,394)
Fair value 203,334 214,366
Available for Sale    
Amortized cost 1,310,721 1,246,728
Gross unrealized gains 13,221 9,784
Gross unrealized losses (8,047) (12,665)
Fair value 1,315,895 1,243,847
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 112,053 124,082
Gross unrealized gains 110 92
Gross unrealized losses (1,839) (2,474)
Fair value 110,324 121,700
Available for Sale    
Amortized cost 791,720 775,803
Gross unrealized gains 3,526 3,698
Gross unrealized losses (6,908) (9,515)
Fair value 788,338 769,986
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 32,659  
Gross unrealized gains 73  
Gross unrealized losses (184)  
Fair value 32,548  
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 92,535 93,586
Gross unrealized gains 475 0
Gross unrealized losses 0 (920)
Fair value 93,010 92,666
States and political subdivisions    
Available for Sale    
Amortized cost 182,853 184,836
Gross unrealized gains 3,350 2,002
Gross unrealized losses (521) (1,797)
Fair value 185,682 185,041
Corporate securities    
Available for Sale    
Amortized cost 92,827 98,596
Gross unrealized gains 1,325 974
Gross unrealized losses (80) (181)
Fair value 94,072 99,389
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 26,395  
Gross unrealized gains 114  
Gross unrealized losses (3)  
Fair value 26,506  
Residential - Non-government agencies    
Available for Sale    
Amortized cost 48,420 51,681
Gross unrealized gains 773 627
Gross unrealized losses (239) (761)
Fair value 48,954 51,547
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,153 135,248
Gross unrealized gains 3,945 2,387
Gross unrealized losses (112) (411)
Fair value 138,986 137,224
Other    
Available for Sale    
Amortized cost 694 564
Gross unrealized gains 115 96
Gross unrealized losses 0 0
Fair value $ 809 $ 660