Subsequent Events (Details) - USD ($)				3 Months Ended
	Nov. 01, 2021	Apr. 30, 2021	Apr. 01, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Oct. 08, 2021	Feb. 01, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Dividends declared per share (usd per share)				$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.60
Assets				$ 35,885,676,000								$ 29,498,442,000
Goodwill				$ 1,204,118,000								$ 1,078,670,000
April 30, 2021 Issuance
Subsequent Event [Line Items]
Subordinated Debt		$ 400,000,000
Subordinated Borrowing, Interest Rate		3.25%
HOASD
Subsequent Event [Line Items]
Deposit Premium on Acquisition			5.90%
Business Combination, Consideration Transferred			$ 255,000,000
Business Combination, Deposits Acquired			$ 4,100,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities										$ 6,400,000
Civic
Subsequent Event [Line Items]
Assets											$ 307,997,000
Goodwill											$ 125,448,000
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Dividends declared per share (usd per share)	$ 0.25