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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income Available to Common Shareholders	$ 70,002	$ 54,310	$ 52,128
Available-for-Sale Securities
Unrealized (loss) gain on available-for-sale securities arising during period	(7,054)	7,396	(1,685)
Reclassification adjustment for net losses (gains)	90	(4,476)	(3,513)
Other comprehensive (loss) income related to available-for-sale securities	(6,964)	2,920	(5,198)
Defined Benefit Pension Plan
Amortization of actuarial net gains	890	849	847
Recognition of unrealized losses	(1,982)	(11)	(690)
Change in underfunded pension liability	(1,092)	838	157
Other comprehensive (loss) income before income taxes	(8,056)	3,758	(5,041)
Tax effect	1,875	(1,391)	1,861
Other comprehensive (loss) income, net of tax	(6,181)	2,367	(3,180)
Comprehensive income, net of tax	$ 63,821	$ 56,677	$ 48,948

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