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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Held-to-Maturity:    
Amortized Cost $ 197,672 $ 217,668
Gross unrealized gains 305 92
Gross unrealized losses (2,263) (3,394)
Fair value 195,714 214,366
Available for Sale    
Amortized cost 1,345,474 1,246,728
Gross unrealized gains 12,749 9,784
Gross unrealized losses (8,118) (12,665)
Fair value 1,350,105 1,243,847
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 105,659 124,082
Gross unrealized gains 127 92
Gross unrealized losses (1,832) (2,474)
Fair value 103,954 121,700
Available for Sale    
Amortized cost 822,342 775,803
Gross unrealized gains 3,720 3,698
Gross unrealized losses (6,976) (9,515)
Fair value 819,086 769,986
Commercial - U.S. Government agencies and sponsored entities    
Available for Sale    
Amortized cost 40,385  
Gross unrealized gains 29  
Gross unrealized losses (186)  
Fair value 40,228  
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 92,013 93,586
Gross unrealized gains 178 0
Gross unrealized losses (431) (920)
Fair value 91,760 92,666
States and political subdivisions    
Available for Sale    
Amortized cost 181,665 184,836
Gross unrealized gains 3,244 2,002
Gross unrealized losses (555) (1,797)
Fair value 184,354 185,041
Corporate securities    
Available for Sale    
Amortized cost 92,440 98,596
Gross unrealized gains 1,444 974
Gross unrealized losses (54) (181)
Fair value 93,830 99,389
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 25,991 0
Gross unrealized gains 116 0
Gross unrealized losses (129) 0
Fair value 25,978 0
Residential - Non-government agencies    
Available for Sale    
Amortized cost 46,881 51,681
Gross unrealized gains 794 627
Gross unrealized losses (211) (761)
Fair value 47,464 51,547
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,105 135,248
Gross unrealized gains 3,273 2,387
Gross unrealized losses (7) (411)
Fair value 138,371 137,224
Other    
Available for Sale    
Amortized cost 665 564
Gross unrealized gains 129 96
Gross unrealized losses 0 0
Fair value $ 794 $ 660