INVESTMENT SECURITIES (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Scheduled maturities of investment securities available-for sale, amortized cost basis
Due within one year	$ 393,006
Due after one year through five years	744,848
Due after five years through ten years	519,814
Due after ten years	939,155
Total investment securities available-for-sale	2,596,823
Scheduled maturities of investment securities available-for sale, estimated fair value
Due within one year	387,737
Due after one year through five years	745,916
Due after five years through ten years	521,439
Due after ten years	937,575
Fair Value	$ 2,592,667	$ 2,733,797