Accumulated Other Comprehensive Loss - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (losses) gains reclassified into earnings			$ (1,642)	$ 42
Related income tax expense (benefit)	$ (5,098)	$ (6,193)	(17,151)	(17,816)
Net income available to common shareholders	20,126	22,371	67,374	66,741
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	0	(40)	56	69
Related income tax expense (benefit)	0	10	(12)	(15)
Net income available to common shareholders	$ 0	$ (30)	$ 44	$ 54