CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 55,168	$ 44,627	$ 21,705
Securities available for sale:
Unrealized holding gains (losses) on available for sale securities	(11,519)	(3,644)	9,054
Tax effect	4,331	1,391	(3,609)
Reclassification of gains (losses) on sales of securities recognized in earnings	564	0	(126)
Tax effect	(212)	0	50
Net of tax amount	(6,836)	(2,253)	5,369
Cash flow hedges:
Unrealized gains (losses) on cash flow hedges	271	(5,207)	(6,062)
Tax effect	(199)	2,088	2,623
Reclassification of amounts into interest expense from termination of interest rate swaps	452	161	0
Tax effect	(170)	(62)	0
Net of tax amount	354	(3,020)	(3,439)
Pension obligation:
Change in pension obligation	507	0	0
Tax effect	(181)	0	0
Net of tax amount	326	0	0
Total other comprehensive income (loss)	(6,156)	(5,273)	1,930
Comprehensive income	$ 49,012	$ 39,354	$ 23,635