Unaudited Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands		Total	Cumulative effect accounting adjustment	[1]	Common Stock	Additional Paid In Capital	Retained Earnings	Retained Earnings Cumulative effect accounting adjustment	[1]	Accumulated Other Comprehensive Income	Unallocated Common Stock Held by ESOP
Beginning balance (in shares) at Dec. 31, 2019					0
Beginning Balance at Dec. 31, 2019		$ 1,600,153	$ (1,131)		$ 0	$ 0	$ 1,644,000	$ (1,131)		$ (43,847)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		8,445					8,445
Other comprehensive income, net of tax		55,267								55,267
Ending balance (in shares) at Mar. 31, 2020					0
Ending balance at Mar. 31, 2020		$ 1,662,734			$ 0	0	1,651,314			11,420	0
Beginning balance (in shares) at Dec. 31, 2020		186,758,154			186,758,154,000
Beginning Balance at Dec. 31, 2020		$ 3,428,052			$ 1,868	1,854,068	1,665,607			54,234	(147,725)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		47,663					47,663
Other comprehensive income, net of tax		(80,426)								(80,426)
Dividends to common shareholders	[2]	(10,324)					(10,324)
ESOP shares committed to be released		$ 2,080				827					1,253
Ending balance (in shares) at Mar. 31, 2021		186,758,154			186,758,154,000
Ending balance at Mar. 31, 2021		$ 3,387,045			$ 1,868	$ 1,854,895	$ 1,702,946			$ (26,192)	$ (146,472)

[1] Represents cumulative impact on retained earnings pursuant to the Company’s (as defined herein) adoption of Accounting Standards Update 2016-02 Leases. The transition adjustment to the opening balance of retained earnings on January 1, 2020 amounted to $1.1 million, net of tax, related to an incremental accrued rent adjustment calculated as a result of electing the hindsight practical expedient.

[2] The Company declared and paid a quarterly cash dividend of $0.06 per share of common stock during the three months ended March 31, 2021.