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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Performance Shares [Member]
Preferred Stock [Member]
Performance Shares [Member]
Common Stock [Member]
Performance Shares [Member]
Additional Paid-in Capital [Member]
Performance Shares [Member]
Retained Earnings [Member]
Performance Shares [Member]
Treasury Stock, Common [Member]
Performance Shares [Member]
AOCI Attributable to Parent [Member]
Performance Shares [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Preferred Stock [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Common Stock [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Additional Paid-in Capital [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Retained Earnings [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Treasury Stock, Common [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
AOCI Attributable to Parent [Member]
Restricted Stock Units (RSUs) [Member]
First of Long Island Corporation [Member]
Restricted Stock Units (RSUs) [Member]
Preferred Stock [Member]
Restricted Stock Units (RSUs) [Member]
Common Stock [Member]
Restricted Stock Units (RSUs) [Member]
Additional Paid-in Capital [Member]
Restricted Stock Units (RSUs) [Member]
Retained Earnings [Member]
Restricted Stock Units (RSUs) [Member]
Treasury Stock, Common [Member]
Restricted Stock Units (RSUs) [Member]
AOCI Attributable to Parent [Member]
Restricted Stock Units (RSUs) [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock, Common [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2023                                           $ 110,927 $ 586,946 $ 33,182 $ 590,970 $ (70,296) $ (35,109) $ 1,216,620
Net income                                           0 0 0 53,422 0 0 53,422
Other comprehensive income, net of tax                                           0 0 0 0 0 (1,644) (1,644)
Cash dividends declared on preferred stock                                           0 0 0 (4,527) 0 0 (4,527)
Cash dividends declared on common stock                                           0 0 0 (20,368) 0 0 (20,368)
Restricted stock grants, net of forfeitures                                           0 0 0 0 0 0 0
Net shares issued in satisfaction of units earned $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0                             0 0 0 0 0 0 0
Share redemption for tax withholdings on performance units and deferred stock units earned 0 0 (1,403) 0 0 0 (1,403)                                          
Stock-based compensation expense                                           0 0 3,216 0 0 0 3,216
Stock grants                                           0 0 0 0 0 0 0
Repurchase of common stock                                           0 0 0 0 (5,820) 0 (5,820)
Balance at Sep. 30, 2024                                           110,927 586,946 34,995 619,497 (76,116) (36,753) 1,239,496
Balance at Jun. 30, 2024                                           110,927 586,946 33,955 610,759 (76,116) (42,244) 1,224,227
Net income                                           0 0 0 17,161 0 0 17,161
Other comprehensive income, net of tax                                           0 0 0 0 0 5,491 5,491
Cash dividends declared on preferred stock                                           0 0 0 (1,509) 0 0 (1,509)
Cash dividends declared on common stock                                           0 0 0 (6,914) 0 0 (6,914)
Restricted stock grants, net of forfeitures                                           0 0 0 0 0 0 0
Net shares issued in satisfaction of units earned                                           0 0 0 0 0 0 0
Share redemption for tax withholdings on performance units and deferred stock units earned                                           0 0 (79) 0 0 0 (79)
Stock-based compensation expense                                           0 0 1,119 0 0 0 1,119
Balance at Sep. 30, 2024                                           110,927 586,946 34,995 619,497 (76,116) (36,753) 1,239,496
Balance at Dec. 31, 2024                                           110,927 586,946 36,347 631,446 (76,116) (47,846) 1,241,704
Net income                                           0 0 0 40,925 0 0 40,925
Other comprehensive income, net of tax                                           0 0 0 0 0 10,736 10,736
Cash dividends declared on preferred stock                                           0 0 0 (4,527) 0 0 (4,527)
Cash dividends declared on common stock                                           0 0 0 (22,900) 0 0 (22,900)
Restricted stock grants, net of forfeitures                                           0 0 0 0 0 0 0
Net shares issued in satisfaction of units earned 0 0 0 0 0 0 0               $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0              
Share redemption for tax withholdings on performance units and deferred stock units earned $ 0 $ 0 $ (1,725) $ 0 $ 0 $ 0 $ (1,725) $ 0 $ 0 $ (507) $ 0 $ 0 $ 0 $ (507)                            
Stock-based compensation expense                                           0 0 3,819 0 0 0 3,819
Stock grants                                           0 0 0 0 0 0 0
Stock issued in connection with FLIC merger                                           0 270,819 0 0 0 0 270,819
Balance at Sep. 30, 2025                                           110,927 857,765 37,934 644,944 (76,116) (37,110) 1,538,344
Balance at Jun. 30, 2025                                           110,927 857,765 36,728 614,532 (76,116) (47,405) 1,496,431
Net income                                           0 0 0 40,976 0 0 40,976
Other comprehensive income, net of tax                                           0 0 0 0 0 10,295 10,295
Cash dividends declared on preferred stock                                           0 0 0 (1,509) 0 0 (1,509)
Cash dividends declared on common stock                                           0 0 0 (9,055) 0 0 (9,055)
Restricted stock grants, net of forfeitures                                           0 0 0 0 0 0 0
Net shares issued in satisfaction of units earned                                           0 0 0 0 0 0 0
Share redemption for tax withholdings on performance units and deferred stock units earned                                           0 0 (98) 0 0 0 (98)
Stock-based compensation expense                                           0 0 1,304 0 0 0 1,304
Balance at Sep. 30, 2025                                           $ 110,927 $ 857,765 $ 37,934 $ 644,944 $ (76,116) $ (37,110) $ 1,538,344