SECURITIES (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale, Amortized Cost
Due in one year or less	$ 875
Due after one year through five years	30,121
Due after five years through ten years	159,389
Due after ten years	616,300
Amortized cost, total	806,685
Available-for-sale, Fair Value
Due in one year or less	891
Due after one year through five years	30,671
Due after five years through ten years	160,327
Due after ten years	605,353
Fair value, total	797,242
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	1,188
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	1,177
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	5,785
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	5,790
Held-to-maturity Securities, Fair Value	6,973	0
Held-to-maturity Securities, Fair Value	$ 6,967