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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains (losses) on available-for-sale securities, net of tax of ($978), $1,084, ($6,938) and $3,958, respectively	$ (978)	$ 1,084	$ (6,938)	$ 3,958
Net reclassification adjustment for net (gains) losses included in net income, net of tax of $0, ($59), $6 and ($66), respectively(1)	0	(59)	6	(66)
Net change in unrealized losses on cash flow hedging derivatives, net of tax of $84, ($127), $667 and ($556), respectively	84	(127)	667	(556)
Net reclassification adjustment for effective portion of cash flow hedges, net of tax of ($73), ($68), ($142) and ($143), respectively(2)	(73)	(68)	(142)	(143)
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($13), ($31), ($39) and ($94), respectively(3)	$ (13)	$ (31)	$ (39)	$ (94)

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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