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Stock and Incentive Compensation Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of Shares        
Outstanding at beginning of period (in shares) 504,437 39,200 224,000  
BTH options converted to OBNK options (in shares)   611,676    
Exercised (in shares) (135,746) (144,785) (184,800)  
Expired (in shares) (15,218) (1,654)    
Outstanding at end of period (in shares) 353,473 504,437 39,200 224,000
Outstanding and exercisable (in shares) 353,473 504,437 39,200  
Weighted Average Exercise Price        
Outstanding at beginning of period (in dollars per share) $ 29.46 $ 10.73 $ 10.86  
BTH options converted to OBNK options (in dollars per share)   28.62    
Exercised (in dollars per share) 23.61 20.80 10.88  
Expired (in dollars per share) 34.48 34.44    
Outstanding at end of period (in dollars per share) 31.49 29.46 10.73 $ 10.86
Outstanding and exercisable (in dollars per share) $ 31.49 $ 29.46 $ 10.73  
Weighted average remaining contractual term (in years) 4 years 5 months 15 days 5 years 1 month 17 days 2 years 3 months 10 days 4 years 11 months 1 day
Weighted average remaining contractual term, outstanding and exercisable (in years) 4 years 5 months 15 days 5 years 1 month 17 days 2 years 3 months 10 days  
Aggregate Intrinsic Value $ 1,670 $ 3,736 $ 1,262 $ 3,789
Aggregate Intrinsic Value, BTH options converted to OBK options   8,838    
Aggregate Intrinsic Value, exercised 1,533 2,992 6,447  
Aggregate Intrinsic Value, outstanding and exercisable $ 1,670 $ 3,736 $ 1,262