CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 12,803	$ 11,380	$ 25,082	$ 22,516
Change in securities available for sale:
Unrealized holding gain (loss) on securities available for sale arising during the period	4,155	(5,230)	11,702	(1,568)
Reclassification adjustment for (gains) losses included in net income	0	0	(52)	(42)
Net securities gain (loss) activity during the period	4,155	(5,230)	11,650	(1,610)
Tax effect	(1,385)	2,046	(3,691)	603
Net of tax amount	2,770	(3,184)	7,959	(1,007)
Defined benefit pension plans:
Net gain (loss) on defined benefit pension plans	0	0	0	(276)
Amortization of net actuarial loss	54	61	108	122
Net gain (loss) activity during the period	54	61	108	(154)
Tax effect	(21)	(24)	(43)	53
Net of tax amount	33	37	65	(101)
Total other comprehensive income (loss), net of tax	2,803	(3,147)	8,024	(1,108)
Comprehensive income	$ 15,606	$ 8,233	$ 33,106	$ 21,408