SECURITIES (Schedule of Amortized Cost and Estimated Fair Value of Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of amortized cost and estimated fair value of securities
Due in one year or less, Amortized Cost	$ 20,599	$ 19,345
Due in one year or less, Estimated Fair Value	20,763	19,434
Due after one year through five years, Amortized Cost	49,747	41,545
Due after one year through five years, Estimated Fair Value	51,522	43,070
Due after five years through ten years, Amortized Cost	295,577	306,900
Due after five years through ten years, Estimated Fair Value	304,936	314,044
Due after ten years, Amortized Cost	691,236	707,445
Due after ten years, Estimated Fair Value	712,443	725,566
Total securities available for sale, Amortized Cost	1,057,159	1,075,235
Total securities available for sale, Estimated Fair Value	$ 1,089,664	$ 1,102,114