CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 11,057	$ 11,503	$ 21,992	$ 22,513
Other comprehensive income (loss), net of tax:
Net change in fair value of securities available for sale		1,378	(1,701)	1,742	(1,037)
Cash flow hedges:
Change in fair value of cash flow hedges		(24)	(1)	(90)	(9)
Net cash flow hedge losses reclassified into earnings	[1]	0	90	0	183
Net change in fair value of cash flow hedges		(24)	89	(90)	174
Defined benefit plan obligation adjustment	[2]	165	354	331	589
Total other comprehensive income (loss), net of tax		1,519	(1,258)	1,983	(274)
Total comprehensive income		$ 12,576	$ 10,245	$ 23,975	$ 22,239

[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.