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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net income	$ 29,127	$ 25,986
Securities available for sale:
Unrealized net holding gains (losses) arising during the period, gross	11,036	(15,454)
Tax effect	(2,759)	3,864
Unrealized net holding gains (losses) arising during the period, net	8,277	(11,590)
Reclassification adjustment for net losses in net income, gross	99	0
Tax effect	(25)	0
Reclassification adjustment for net losses in net income, net	74	0
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	167	188
Tax effect	(42)	(47)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	125	141
Total securities available for sale, net	8,476	(11,449)
Cash flow hedges:
Unrealized (losses) gains on derivatives (cash flow hedges), gross	(170)	1,048
Tax effect	43	(262)
Unrealized (losses) gains on derivatives (cash flow hedges), net	(127)	786
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), gross	(799)	(359)
Tax effect	200	90
Reclassification of net unrealized (gains) on cash flow hedges to interest (income), net	(599)	(269)
Total cash flow hedges, net	(726)	517
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	656	295
Tax effect	(164)	(74)
Amortization of prior service cost and actuarial losses, net	492	221
Total pension and other benefits, net	492	221
Total other comprehensive income (loss)	8,242	(10,711)
Comprehensive income	$ 37,369	$ 15,275

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