INVESTMENT SECURITIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities
Proceeds from sales	$ 43,788	$ 60,387	$ 395,630		$ 386,108
Gross realized gains	2,514	1,084	6,730		12,006
Gross realized losses			127	[1]
Related tax expense	1,056	455	2,773		5,043
Other than temporary impairment	0	0	0		0	0
MetroCorp
Schedule of Available-for-sale Securities
Gross realized losses			$ 127

[1] The gross $127 thousand of losses resulted from the investment securities acquired from MetroCorp which were sold immediately after the acquisition closed.