CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 13,732	$ 4,290
Unrealized gain on available-for-sale investment securities:
Unrealized holding gain arising during the period, net of tax expense of $375 thousand in 2015 and $1.7 million in 2014	815	2,988
Less: reclassification adjustment for net (gains) losses included in net income net of tax expense of $67 thousand in 2015 and net of tax benefit of $6 thousand in 2014	(135)	11
Total unrealized gain (loss) on available-for-sale investment securities	680	2,999
Unrealized loss on derivative instruments designated as cash flow hedges, net of tax benefit of $137 thousand in 2015 and $82 thousand in 2014	(245)	(150)
Other comprehensive income	435	2,849
Comprehensive income	$ 14,167	$ 7,139