SECURITIES (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available-for-sale, Amortized Cost
Due in one year or less	$ 3,131
Due after one year through five years	89,497
Due after five years through ten years	103,955
Due after ten years	546,051
Amortized cost, total	742,634
Available-for-sale, Fair Value
Due in one year or less	3,188
Due after one year through five years	89,995
Due after five years through ten years	105,684
Due after ten years	543,489
Fair value, total	742,356
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract]
Due in one year or less	0
Due after one year through five years	2,250
Due after five years through ten years	1,143
Due after ten years	56,841
Held-to-maturity securities, at amortized cost	60,234	$ 20,179
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract]
Due in one year or less	0
Due after one year through five years	2,284
Due after five years through ten years	1,146
Due after ten years	56,379
Held-to-maturity Securities, Fair Value	$ 59,809	$ 20,425