INVESTMENT SECURITIES (Details 6) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Scheduled maturities of investment securities available-for sale, amortized cost basis
Due within one year	$ 457,710
Due after one year through five years	557,768
Due after five years through ten years	549,307
Due after ten years	969,378
Total investment securities available-for-sale	2,534,163
Scheduled maturities of investment securities available-for sale, estimated fair value
Due within one year	451,738
Due after one year through five years	558,346
Due after five years through ten years	553,528
Due after ten years	966,040
Total investment securities available-for-sale	$ 2,529,652