CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net Income		$ 14,273	$ 12,820
Net change in unrealized losses on available-for-sale securities:
Net change in unrealized losses on available-for-sale securities, net of tax of ($2,985) and $3,124, respectively		10,899	(11,402)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Net change in unrealized losses on cash flow hedging derivatives, net of tax of $253 and ($355), respectively		(925)	1,328
Net reclassification adjustment for effective portion of cash flow hedges, net of tax of ($25) and ($13), respectively(1)	[1]	94	51
Net change in unrealized losses on cash flow hedging derivatives, net of tax		(831)	1,379
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($13) and ($31), respectively(2)	[2]	48	116
Other comprehensive income (loss)		10,116	(9,907)
Comprehensive Income		$ 24,389	$ 2,913

[1] (1)Reclassified into the consolidated statements of income within interest on borrowings and subordinated debentures.

[2] (2)Reclassified into the consolidated statements of income within salaries and employee benefits and other expenses.