CASH AND SECURITIES (Available-for-sale Securities Debt Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amortized Cost
Maturing in one year or less	$ 9,334	$ 25,136
Maturing after one year through five years	278,629	322,493
Maturing after five years through ten years	45,425	58,468
Maturing after ten years through twenty years	13,846	15,535
Maturing after twenty years	64,190	53,328
Amoritzed cost	411,424	474,960
Fair Value
Maturing in one year or less	9,364	25,256
Maturing after one year through five years	277,439	319,489
Maturing after five years through ten years	45,610	57,782
Maturing after ten years through twenty years	13,879	15,135
Maturing after twenty years	64,729	52,618
Fair Value	$ 411,021	$ 470,280