Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net income		$ 45,871	$ 39,970
Unrealized gain (loss) from securities
Net unrealized holding gain (loss) from available for sale debt securities arising during the period, net of tax		32,063	(26,048)
Reclassification adjustment of net (gain) loss from sale of available for sale debt securities included in income, net of tax		1,417	(78)
Net unrealized gain (loss) from securities, net of reclassification adjustment		33,480	(26,126)
Pension plan liability adjustment:
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax		61	61
Pension plan liability adjustment, net		61	61
Unrealized gain (loss) from cash flow hedging instruments
Net unrealized gain (loss) in cash flow hedging instruments arising during the period, net of tax		4,810	0
Net unrealized gain (loss) from cash flow hedging instruments, net of reclassification adjustment		4,810	0
Other Comprehensive Income (Loss)	[1]	38,351	(26,065)
Total comprehensive income		$ 84,222	$ 13,905

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.