CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 13,113	$ 11,589
UNREALIZED GAIN (LOSS) ON SECURITIES AVAILABLE-FOR-SALE SECURITIES:
Unrealized gains (losses) on securities available-for-sale arising during the period	3,122	(513)
Unrealized gains (losses) on securities available-for-sale after reclassification	3,122	(513)
Less income tax expense (benefit)	1,311	(217)
Net change in net unrealized gains (losses) on securities available-for-sale	1,811	(296)
UNREALIZED GAIN ON INTEREST-ONLY STRIP:
Net unrealized (losses) gains on interest-only strips arising during the period	(19)	21
Less income tax (benefit) expense	(8)	9
Net unrealized changes in net gains on interest-only strips	(11)	12
ACCUMULATED OTHER COMPREHENSIVE INCOME ("AOCI") ON BOLI UNRECOGNIZED PRIOR SERVICE COST:
AOCI on BOLI unrecognized prior service cost	13	(134)
Net changes in AOCI on BOLI unrecognized prior service cost	13	(134)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	1,813	(418)
TOTAL COMPREHENSIVE INCOME	$ 14,926	$ 11,171