Business Combinations - Additional information (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Apr. 01, 2022 USD ($) $ / shares shares	Feb. 01, 2022 USD ($)	Dec. 01, 2021 USD ($) Branch shares	Oct. 08, 2021 USD ($)	Feb. 28, 2023 shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill, other increase (decrease)						$ (2,600)
Goodwill						1,868,936	$ 1,868,936	$ 1,459,008
Assets						60,934,974	57,462,749
Net loans						49,764,215	46,458,545
Deposits						49,242,829	47,636,914
Merger expenses						$ 14,100	$ 71,200	$ 8,900
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Assets			$ 1,400,000
Net loans			915,000
Deposits			$ 1,200,000
Number of branches | Branch			7
Westchester Bank Holding Corporation
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition for every share owned (in shares) | shares			229.645
Shares issued in connection with acquisition (in shares) | shares			15,700,000
Consideration transferred			$ 211,100
Bank Leumi Le-Israel Corporation
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition for every share owned (in shares) | shares	3.8025
Cash paid for every share owned in connection with acquisition (USD per share) | $ / shares	$ 5.08
Shares issued in connection with acquisition (in shares) | shares	85,000,000
Payments to acquire business	$ 113,400
Consideration transferred	$ 1,200,000
Percentage of common stock transferred in connection with acquisition	14.00%
Landmark Insurance of the Palm Beaches
Business Acquisition [Line Items]
Payments to acquire business		$ 8,600
Contingent consideration liability		1,000
Goodwill		4,400
Assets acquired and liabilities assumed other than goodwill		$ 6,200
Dudley Ventures
Business Acquisition [Line Items]
Shares issued in connection with acquisition (in shares) | shares					327,083
Payments to acquire business				$ 11,300
Consideration transfer, equity interest issued and issuable				$ 3,750