Accumulated Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Other comprehensive income (loss), Pre-tax Amount		$ 7,212		$ (2,851)		$ 14,580	$ (11,204)
Other comprehensive income (loss), Tax Effect		1,818		(718)		3,676	(2,824)
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount		5,164		(2,327)		10,283	(8,762)
Amounts reclassified from accumulated other comprehensive income (loss)		230		194		621	382
Total other comprehensive income (loss), net of tax		5,394	$ 5,510	(2,133)	$ (6,247)	10,904	(8,380)
Securities Available for Sale and Transferred Securities [Member]
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount		7,046		(3,414)		14,230	(11,879)
Reclassification, Pre-tax Amount	[1]	(42)		90		132	172
Other comprehensive income (loss), Pre-tax Amount		7,004		(3,324)		14,362	(11,707)
Other comprehensive income (loss), before Reclassifications, Tax Effect		1,776		(860)		3,587	(2,994)
Reclassification, Tax Effect	[1]	(11)		23		33	44
Other comprehensive income (loss), Tax Effect		1,765		(837)		3,620	(2,950)
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount		5,270		(2,554)		10,643	(8,885)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(31)		67		99	128
Total other comprehensive income (loss), net of tax		5,239		(2,487)		10,742	(8,757)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Other comprehensive income (loss), Pre-tax Amount		(141)		303		(481)	164
Other comprehensive income (loss), Tax Effect		(35)		76		(121)	41
Total other comprehensive income (loss), net of tax		(106)		227		(360)	123
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]
Other comprehensive income (loss), Pre-tax Amount		(17)		(18)		(33)	(36)
Other comprehensive income (loss), Tax Effect		(4)		(5)		(8)	(10)
Total other comprehensive income (loss), net of tax		(13)		(13)		(25)	(26)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Other comprehensive income (loss), Pre-tax Amount		366		188		732	375
Other comprehensive income (loss), Tax Effect		92		48		185	95
Total other comprehensive income (loss), net of tax		274		140		547	280
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Other comprehensive income (loss), Pre-tax Amount		349		170		699	339
Other comprehensive income (loss), Tax Effect		88		43		177	85
Total other comprehensive income (loss), net of tax		$ 261		$ 127		$ 522	$ 254

[1] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.