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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Held-to-Maturity:    
Amortized Cost $ 211,426 $ 217,668
Gross unrealized gains 87 92
Gross unrealized losses (3,332) (3,394)
Fair value 208,181 214,366
Available for Sale    
Amortized cost 1,302,300 1,246,728
Gross unrealized gains 11,264 9,784
Gross unrealized losses (10,675) (12,665)
Fair value 1,302,889 1,243,847
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 118,372 124,082
Gross unrealized gains 87 92
Gross unrealized losses (2,262) (2,474)
Fair value 116,197 121,700
Available for Sale    
Amortized cost 826,491 775,803
Gross unrealized gains 3,466 3,698
Gross unrealized losses (8,585) (9,515)
Fair value 821,372 769,986
Commercial - U.S. Government-sponsored entities    
Available for Sale    
Amortized cost 13,419  
Gross unrealized gains 41  
Gross unrealized losses 0  
Fair value 13,460  
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 93,054 93,586
Gross unrealized gains 0 0
Gross unrealized losses (1,070) (920)
Fair value 91,984 92,666
States and political subdivisions    
Available for Sale    
Amortized cost 183,547 184,836
Gross unrealized gains 2,942 2,002
Gross unrealized losses (1,068) (1,797)
Fair value 185,421 185,041
Corporate securities    
Available for Sale    
Amortized cost 93,210 98,596
Gross unrealized gains 1,230 974
Gross unrealized losses (105) (181)
Fair value 94,335 99,389
Residential - Non-government agencies    
Available for Sale    
Amortized cost 49,848 51,681
Gross unrealized gains 507 627
Gross unrealized losses (838) (761)
Fair value 49,517 51,547
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,201 135,248
Gross unrealized gains 2,980 2,387
Gross unrealized losses (79) (411)
Fair value 138,102 137,224
Other    
Available for Sale    
Amortized cost 584 564
Gross unrealized gains 98 96
Gross unrealized losses 0 0
Fair value $ 682 $ 660