Regulatory and Capital Requirements - Schedule of Actual Capital Positions and Ratios under Banking Regulations (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shareholders’ equity	$ 6,400,802	$ 5,084,066	$ 4,592,120	$ 4,384,188
Total Risk-based Capital
Risk-based capital actual, amount	$ 5,569,639	$ 4,454,485
Risk-based capital actual, ratio	0.1163	0.1310
Risk-based capital minimum capital requirements, amount	$ 5,026,621	$ 3,569,144
Risk-based capital minimum capital requirements, ratio	0.1050	0.1050
Common Equity Tier 1 Capital
Common equity tier 1 capital, amount	$ 4,315,659	$ 3,417,930
Common equity tier 1 capital, ratio	9.01%	10.06%
Common equity tier 1 capital minimum capital requirements, amount	$ 3,351,080	$ 2,379,429
Common equity tier 1 capital minimum capital requirements, ratio	7.00%	7.00%
Tier 1 Risk-based Capital
Tier 1 risk-based capital actual, amount	$ 4,530,500	$ 3,632,771
Tier 1 risk-based capital actual, ratio	0.0946	0.1069
Tier 1 risk-based capital minimum capital requirements, amount	$ 4,069,169	$ 2,889,307
Tier 1 risk-based capital minimum capital requirements, ratio	0.0850	0.0850
Tier 1 Leverage Capital
Tier 1 leverage capital actual, amount	$ 4,530,500	$ 3,632,771
Tier 1 leverage capital actual, ratio	0.0823	0.0888
Tier 1 leverage capital minimum capital requirements, amount	$ 2,200,822	$ 1,635,508
Tier 1 leverage capital minimum capital requirements, ratio	0.0400	0.0400
Retained Earnings
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shareholders’ equity	$ 1,218,445	$ 883,645	611,158	$ 443,559
Allowance for PCD loans (2) | Retained Earnings
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Shareholders’ equity			$ (47,300)
Valley National Bank
Total Risk-based Capital
Risk-based capital actual, amount	$ 5,659,511	$ 4,571,448
Risk-based capital actual, ratio	0.1184	0.1345
Risk-based capital minimum capital requirements, amount	$ 5,018,129	$ 3,567,618
Risk-based capital minimum capital requirements, ratio	0.1050	0.1050
Risk-based capital to be well capitalized under prompt corrective action provision, amount	$ 4,779,170	$ 3,397,732
Risk-based capital to be well capitalized under prompt corrective action provision, ratio	0.1000	0.1000
Common Equity Tier 1 Capital
Common equity tier 1 capital, amount	$ 5,284,372	$ 4,308,734
Common equity tier 1 capital, ratio	11.06%	12.68%
Common equity tier 1 capital minimum capital requirements, amount	$ 3,345,419	$ 2,378,412
Common equity tier 1 capital minimum capital requirements, ratio	7.00%	7.00%
Common equity tier 1 capital to be well capitalized under prompt corrective action provision, amount	$ 3,106,461	$ 2,208,526
Common equity tier 1 capital to be well capitalized under prompt corrective action provision, ratio	6.50%	6.50%
Tier 1 Risk-based Capital
Tier 1 risk-based capital actual, amount	$ 5,284,372	$ 4,308,734
Tier 1 risk-based capital actual, ratio	0.1106	0.1268
Tier 1 risk-based capital minimum capital requirements, amount	$ 4,062,295	$ 2,888,072
Tier 1 risk-based capital minimum capital requirements, ratio	0.0850	0.0850
Tier 1 risk-based capital to be well capitalized under prompt corrective action provision, amount	$ 3,823,336	$ 2,718,185
Tier 1 risk-based capital to be well capitalized under prompt corrective action provision, ratio	0.0800	0.0800
Tier 1 Leverage Capital
Tier 1 leverage capital actual, amount	$ 5,284,372	$ 4,308,734
Tier 1 leverage capital actual, ratio	0.0960	0.1053
Tier 1 leverage capital minimum capital requirements, amount	$ 2,200,891	$ 1,636,097
Tier 1 leverage capital minimum capital requirements, ratio	0.0400	0.0400
Tier 1 leverage capital to be well capitalized under prompt corrective action provision, amount	$ 2,751,114	$ 2,045,121
Tier 1 leverage capital to be well capitalized under prompt corrective action provision, ratio	0.0500	0.0500