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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 32,379	$ 29,807	$ 92,061	$ 83,914
Securities available for sale:
Unrealized net holding gains (losses) arising during the period, gross	2,360	(5,798)	26,787	(26,605)
Tax effect	(590)	1,449	(6,697)	6,651
Unrealized net holding gains (losses) arising during the period, net	1,770	(4,349)	20,090	(19,954)
Reclassification adjustment for net (gains) losses in net income, gross	(20)	0	79	0
Tax effect	5	0	(20)	0
Reclassification adjustment for net (gains) losses in net income, net	(15)	0	59	0
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	190	168	556	533
Tax effect	(47)	(42)	(139)	(133)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	143	126	417	400
Total securities available for sale, net	1,898	(4,223)	20,566	(19,554)
Cash flow hedges:
Unrealized gains (losses) on derivatives (cash flow hedges), gross	9	175	(475)	1,647
Tax effect	(2)	(44)	119	(412)
Unrealized gains (losses) on derivatives (cash flow hedges), net	7	131	(356)	1,235
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), gross	(395)	(638)	(1,932)	(1,537)
Tax effect	98	159	483	384
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), net	(297)	(479)	(1,449)	(1,153)
Total cash flow hedges, net	(290)	(348)	(1,805)	82
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	672	286	1,985	876
Tax effect	(168)	(71)	(496)	(219)
Amortization of prior service cost and actuarial losses, net	504	215	1,489	657
Total pension and other benefits, net	504	215	1,489	657
Total other comprehensive income (loss)	2,112	(4,356)	20,250	(18,815)
Comprehensive income	$ 34,491	$ 25,451	$ 112,311	$ 65,099

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