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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Held-to-Maturity:    
Amortized Cost $ 226,573 $ 247,917
Gross unrealized gains 3,958 123
Gross unrealized losses (2) (3,904)
Fair value 230,529 244,136
Available for Sale    
Amortized cost 1,231,619 1,267,503
Gross unrealized gains 30,957 13,615
Gross unrealized losses (352) (8,863)
Fair value 1,262,224 1,272,255
Residential - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 132,470 152,315
Gross unrealized gains 890 123
Gross unrealized losses (2) (2,915)
Fair value 133,358 149,523
Available for Sale    
Amortized cost 747,636 771,657
Gross unrealized gains 11,881 5,885
Gross unrealized losses (314) (5,633)
Fair value 759,203 771,909
Commercial - U.S. Government-sponsored entities    
Held-to-Maturity:    
Amortized Cost 94,103 95,602
Gross unrealized gains 3,068 0
Gross unrealized losses 0 (989)
Fair value 97,171 94,613
States and political subdivisions    
Available for Sale    
Amortized cost 185,504 187,552
Gross unrealized gains 6,300 3,819
Gross unrealized losses (26) (898)
Fair value 191,778 190,473
Corporate securities    
Available for Sale    
Amortized cost 107,011 107,721
Gross unrealized gains 2,609 1,077
Gross unrealized losses (12) (227)
Fair value 109,608 108,571
Residential - Non-government agencies    
Available for Sale    
Amortized cost 55,480 64,286
Gross unrealized gains 2,142 733
Gross unrealized losses 0 (987)
Fair value 57,622 64,032
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 135,296 135,439
Gross unrealized gains 7,933 2,033
Gross unrealized losses 0 (1,118)
Fair value 143,229 136,354
Other    
Available for Sale    
Amortized cost 692 848
Gross unrealized gains 92 68
Gross unrealized losses 0 0
Fair value $ 784 $ 916