Note 9 - Subordinated Debentures - Summary of Mandatory Redeemable Trust Preferred Securities (Details) - Subordinated Debt [Member] - Center Bancorp Statutory Trust II [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 19, 2003
Securities issued	$ 5,000	$ 5
Liquidation value (in dollars per share)	$ 1,000
Coupon rate	2.85%
Maturity	Jan. 23, 2034
Redeemable by issuer beginning	Jan. 23, 2009