CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 11,010		$ 9,298
Securities available for sale:
Net change in fair value of securities available for sale	664		612
Cash flow hedges:
Change in fair value of cash flow hedges	(8)		(16)
Net cash flow hedge losses reclassified into earnings	93	[1]	92	[1]
Net change in fair value of cash flow hedges	85		76
Defined benefit plan obligation adjustment	235	[2]	88	[2]
Total other comprehensive (loss) income, net of tax	984		776
Total comprehensive income	$ 11,994		$ 10,074

[1] Included in interest expense on junior subordinated debentures in the Consolidated Statements of Income.

[2] Included in salaries and employee benefits expense in the Consolidated Statements of Income.