Northfield Bancorp Inc's financial achievements in 2023 included maintaining strong liquidity with significant available-for-sale securities and loans readily available for pledge. The company also continued its stock repurchase program, buying back 430,521 shares for a cost of $4.4 million in Q4 and 3.1 million shares totaling $36.9 million for the full year. Additionally, the company declared a cash dividend of $0.13 per share, showcasing its commitment to returning value to shareholders.