CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
NET INCOME	$ 11,582	$ 9,184
OTHER COMPREHENSIVE INCOME (LOSS), NET OF INCOME TAXES:
Unrealized holding gain (loss) on AFS securities arising during the period	(378)	(55)
Income tax benefit (expense) related to AFS unrealized holding gains (losses)	136	20
Reclassification for net (gains) losses on AFS securities realized in earnings	(117)	0
Income tax benefit (expense) related to AFS unrealized holding gains (losses)	42	0
Amortization of unrealized gain on tax exempt securities transferred from available-for-sale to held-to-maturity	0	2
Other comprehensive income (loss)	(317)	(33)
COMPREHENSIVE INCOME	$ 11,265	$ 9,151