INVESTMENT SECURITIES Amortized Cost and Fair Value of Investment Securities, by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available for Sale Securities, Maturities, Amortized Cost Basis [Abstract]
Due in one year or less	$ 5,545
Due after one through five years	45,088
Due after five through ten years	178,463
Due after ten years	1,679,415
Marketable equity securities	3,583
Total investments	1,912,094	1,739,047
Available for Sale Securities, Maturities, Fair Value [Abstract]
Due in one year or less	5,684
Due after one through five years	48,967
Due after five through ten years	182,542
Due after ten years	1,651,614
Marketable equity securities	5,300
Investment securities available-for-sale, at fair value	1,894,107	1,802,213
Held to Maturity Securities, Maturities, Amortized Cost [Abstract]
Due in one year or less	0
Due after one through five years	1,262
Due after five through ten years	104,261
Due after ten years	332,922
Marketable equity securities	0
Total investments	438,445	464,166
Held to Maturity Securities, Maturities, Fair Value [Abstract]
Due in one year or less	0
Due after one through five years	1,289
Due after five through ten years	107,015
Due after ten years	343,898
Marketable equity securities	0
Total investments	$ 452,202	$ 499,149