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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		7 Months Ended
	Jul. 28, 2021	Jul. 27, 2021	Aug. 05, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Aug. 05, 2021	Jul. 23, 2021	Jan. 27, 2021	Dec. 31, 2020
Subsequent events
Total assets				$ 40,375,869		$ 40,375,869					$ 37,789,873
Loans				23,682,677		23,682,677					24,206,825
Deposits				$ 33,242,369		$ 33,242,369					$ 30,693,882
Common stock cash dividends declared, per share (in dollars per share)				$ 0.47	$ 0.47	$ 0.94	$ 0.94
2021 Stock Repurchase Plan
Subsequent events
Shares authorized under repurchase program										3,500,000
Number of shares repurchased				700,000
Average price per share				$ 85.94
Atlantic Capital
Subsequent events
Total assets				$ 3,800		$ 3,800
Loans				2,300		2,300
Deposits				$ 3,300		$ 3,300
Subsequent event
Subsequent events
Common stock cash dividends declared, per share (in dollars per share)	$ 0.49	$ 0.47
Subsequent event | 2021 Stock Repurchase Plan
Subsequent events
Number of shares repurchased			353,403					1,053,403
Average price per share			$ 76.17					$ 82.66
Additional shares available for repurchase			2,400,000					2,400,000
Subsequent event | Atlantic Capital
Subsequent events
Number of shares owned									0.36

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