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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (losses) gains reclassified into earnings			$ (2,103)	$ 297
Related income tax expense (income)	$ (4,732)	$ (5,813)	(12,054)	(11,623)
Net income available to common shareholders	18,251	22,751	47,249	44,370
Securities available-for-sale: | Amounts reclassified from Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (losses) gains reclassified into earnings	(6)	21	56	109
Related income tax expense (income)	2	(4)	(12)	(25)
Net income available to common shareholders	$ (4)	$ 17	$ 44	$ 84