Accumulated Other Comprehensive Loss Schedule Of Amounts Reclassified Out 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings			$ 297	$ 772
Related income tax expense	$ (5,813)	$ (5,358)	(11,623)	(9,763)
Net income available to common shareholders	22,751	20,979	44,370	38,590
Unrealized Gain (Losses) on Securities Available-for-Sale | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	21	0	109	0
Related income tax expense	5	0	(25)	0
Net income available to common shareholders	$ (16)	$ 0	$ 84	$ 0