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Stock and Incentive Compensation Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of Shares        
Outstanding at beginning of period (in shares) 353,473 504,437 39,200  
BTH options converted to OBNK options (in shares)     611,676  
Exercised (in shares) (73,188) (135,746) (144,785)  
Expired and forfeited (in shares) (54,451) (15,218) (1,654)  
Outstanding at end of period (in shares) 225,834 353,473 504,437 39,200
Outstanding and exercisable (in shares) 225,834 353,473 504,437  
Weighted Average Exercise Price        
Outstanding at beginning of period (in dollars per share) $ 31.49 $ 29.46 $ 10.73  
BTH options converted to OBNK options (in dollars per share)     28.62  
Exercised (in dollars per share) 26.50 23.61 20.80  
Expired and forfeited (in dollars per share) 35.06 34.48 34.44  
Outstanding at end of period (in dollars per share) 32.24 31.49 29.46 $ 10.73
Outstanding and exercisable (in dollars per share) $ 32.24 $ 31.49 $ 29.46  
Weighted average remaining contractual term (in years) 3 years 8 months 19 days 4 years 5 months 15 days 5 years 1 month 17 days 2 years 3 months 10 days
Weighted average remaining contractual term, outstanding and exercisable (in years) 3 years 8 months 19 days 4 years 5 months 15 days 5 years 1 month 17 days  
Aggregate Intrinsic Value $ 614 $ 1,670 $ 3,736 $ 1,262
Aggregate Intrinsic Value, BTH options converted to OBK options     8,838  
Aggregate Intrinsic Value, exercised 559 1,533 2,992  
Aggregate Intrinsic Value, outstanding and exercisable $ 614 $ 1,670 $ 3,736