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Accumulated Other Comprehensive Loss Schedule of Changes In Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Six months ended June 30,
Beginning Balance	$ 619,241	$ 491,882	$ 600,764	$ 502,507
Other comprehensive income	10,939	(2,437)	19,570	(10,650)
Adoption of new accounting pronouncement				0
Ending balance	636,908	503,754	636,908	503,754
Defined Benefit Pension Plans
Six months ended June 30,
Beginning Balance	(5,871)	(5,033)	(5,871)	(5,033)
Ending balance	(5,871)	(5,033)	(5,871)	(5,033)
Unrealized Gain (Losses) on Securities Available-for-Sale
Six months ended June 30,
Beginning Balance	20	(11,481)	(8,611)	(611)
Other comprehensive loss before reclassifications	10,956	(2,437)	19,654	(10,650)
Amounts reclassified from other comprehensive loss	(17)	0	(84)	0
Other comprehensive income	10,939	(2,437)	19,570	(10,650)
Adoption of new accounting pronouncement		0		2,657
Ending balance	10,959	(13,918)	10,959	(13,918)
Accumulated Other Comprehensive Income (Loss)
Six months ended June 30,
Beginning Balance	(5,851)	(16,514)	(14,482)	(5,644)
Other comprehensive loss before reclassifications	10,956	(2,437)	19,654	(10,650)
Amounts reclassified from other comprehensive loss	(17)	0	(84)	0
Other comprehensive income	10,939	(2,437)	19,570	(10,650)
Adoption of new accounting pronouncement				2,657
Ending balance	$ 5,088	$ (18,951)	$ 5,088	$ (18,951)

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