CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 40,911	$ 29,450	$ 19,748
Fair value of derivative instruments designated as cash flow hedges:
Change in fair value of derivative instruments designated as cash flow hedges during the period, before tax	3,694	(6,854)
Unrealized (losses) gains on investment securities:
Unrealized (losses) gains on investment securities arising during the period	(18,576)	3,956	4,814
Less: reclassification adjustment for gains included in net income	(316)	(4,324)	(485)
Transfer of unrealized loss on securities from available for sale to held to maturity during the period	(5,708)
Unrealized (losses) gains on investment securities, before tax	(24,600)	(368)	4,329
Other comprehensive (losses) income, before taxes	(20,906)	(7,222)	4,329
Income tax (benefit) expense related to items of other comprehensive (loss) income	(7,317)	(2,501)	1,472
Other comprehensive (loss) income, net of tax	(13,589)	(4,721)	2,857
Comprehensive income	27,322	24,729	22,605
Comprehensive income attributable to noncontrolling interests		(510)	(308)
Preferred Shareholders [Member]
Unrealized (losses) gains on investment securities:
Comprehensive income	(347)	(510)	(1,372)
Common Shareholders [Member]
Unrealized (losses) gains on investment securities:
Comprehensive income	$ 26,975	$ 23,709	$ 20,925