Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income		$ 50,727	$ 46,415	$ 148,322	$ 128,134
Unrealized gain (loss) from securities
Net unrealized holding gain (loss) from available for sale debt securities arising during the period, net of tax		14,593	(14,149)	86,519	(48,043)
Reclassification adjustment of net (gain) loss from sale of available for sale debt securities included in income, net of tax				(1,636)	(81)
Net unrealized gain (loss) from securities, net of reclassification adjustment		14,593	(14,149)	84,883	(48,124)
Pension plan liability adjustment:
Amortization of unrecognized net actuarial loss included in net periodic pension cost, net of tax		62	61	184	183
Pension plan liability adjustment, net		62	61	184	183
Unrealized gain (loss) from cash flow hedging instruments
Net unrealized gain in cash flow hedging instruments arising during the period, net of tax		3,137	0	15,180	0
Reclassification adjustment from net gain in cash flow hedging instruments included in income, net of tax		(58)	0	(58)	0
Net unrealized gain from cash flow hedging instruments, net of reclassification adjustment		3,079	0	15,122	0
Other Comprehensive Income (Loss)	[1]	17,734	(14,088)	100,189	(47,941)
Total comprehensive income		$ 68,461	$ 32,327	$ 248,511	$ 80,193

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