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Business Combinations - Schedule of Supplemental Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Business Combination [Line Items] |  |  |  |  |
Merger related expenses |  | $ 42,765 | $ 0 | $ 46,915 | $ 0
Flushing Financial Corporation |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Merger related expenses |  |  |  | 46,900 |
Estimated tax-adjusted earnings per share impact (in dollars per share) |  |  |  |  | $ 0.37
Flushing Actual from June 1, 2026 to June 30, 2026 |  |  |  |  |
Net interest income | $ 19,068 |  |  |  |
Credit loss expense | (109) |  |  |  |
Non-interest income | 1,350 |  |  |  |
Non-interest expense | 14,813 |  |  |  |
Income before income taxes | 5,714 |  |  |  |
Provision for income taxes | 1,607 |  |  |  |
Net income | 4,107 |  |  |  |
Net income available to common stockholders | $ 4,107 |  |  |  |
Pro Forma |  |  |  |  |
Net interest income |  |  |  | 316,979 | $ 287,326
Credit loss expense |  |  |  | 8,751 | 16,891
Non-interest income |  |  |  | 22,810 | 38,337
Non-interest expense |  |  |  | 257,942 | 275,657
Income before income taxes |  |  |  | 73,096 | 33,115
Provision for income taxes |  |  |  | 20,467 | 9,272
Net income |  |  |  | 52,629 | 23,843
Net income available to common stockholders |  |  |  | $ 52,629 | $ 20,000
Average diluted shares outstanding (in shares) |  |  |  | 97,712 | 98,555
Fully diluted earnings per share (in dollars per share) |  |  |  | $ 0.54 | $ 0.20

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