Accumulated Other Comprehensive Income - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	$ 232	$ (2,339)
Related income tax expense	(4,987)	(7,322)
Net income available to common shareholders	19,814	29,000
Securities available-for-sale: | Amounts reclassified from Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	283	63
Related income tax expense	(68)	(15)
Net income available to common shareholders	$ 215	$ 48