Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 10,759	$ 10,744	$ 19,907	$ 21,585
Other comprehensive income (loss):
Change in net unrealized holding gains (losses) on available-for-sale securities	8,442	7,214	(408)	15,631
Change in funded status of pension plan		88		176
Change in net unrealized loss on derivative instruments	362	(2,513)	(3,402)	(4,058)
Other comprehensive income (loss) before income taxes	8,804	4,789	(3,810)	11,749
Income tax expense (benefit)	2,636	1,469	(1,142)	3,567
Other comprehensive income (loss)	6,168	3,320	(2,668)	8,182
Comprehensive income	$ 16,927	$ 14,064	$ 17,239	$ 29,767