Accumulated Other Comprehensive Income (Loss) - Reclassifications (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	$ 5,674	$ 11,895	$ 4,415
Income tax expense	(35,259)	(21,375)	(29,325)
Subordinated debentures and term loans	6,642	6,944	8,309
Salaries and employee benefits	166,995	155,937	144,037
Net income	205,531	148,600	164,460
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net income	3,591	8,615	3,140
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on available for sale securities
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains on sales of available for sale securities	5,674	11,895	4,415
Income tax expense	(1,192)	(2,498)	(927)
Net income	4,482	9,397	3,488
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on cash flow hedges
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	219	190	70
Subordinated debentures and term loans	(1,044)	(906)	(334)
Net income	(825)	(716)	(264)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains (losses) on defined benefit plans
Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	18	18	22
Salaries and employee benefits	(84)	(84)	(106)
Net income	$ (66)	$ (66)	$ (84)