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REGULATORY CAPITAL MATTERS - Actual and Required Capital (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Total Capital (to risk weighted assets)    
Capital $ 1,092,618 $ 722,010
Capital to Risk Weighted Assets 0.1239 0.1608
Capital Required for Capital Adequacy $ 705,765 $ 359,214
Capital Required for Capital Adequacy to Risk Weighted Assets 0.0800 0.0800
Plus Capital Conservation Buffer $ 926,317 $ 471,468
Plus Capital Conservation Buffer to Risk Weighted Assets 0.1050 0.1050
Common Equity Tier 1 Capital (to risk weighted assets)    
Common Equity Tier 1 Risk Based Capital $ 885,652 $ 559,926
Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets 10.04% 12.47%
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy $ 396,993 $ 202,058
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Plus Common Equity Tier 1 Risk Based Capital $ 617,545 $ 314,312
Plus Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets 7.00% 7.00%
Tier 1 Capital (to risk weighted assets)    
Tier 1 Risk Based Capital $ 895,520 $ 569,678
Tier 1 Risk Based Capital to Risk Weighted Assets 0.1015 0.1269
Tier 1 Risk Based Capital Required for Capital Adequacy $ 529,324 $ 269,410
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 0.0600 0.0600
Plus Tier 1 Risk Based Capital $ 749,876 $ 381,665
Plus Tier 1 Risk Based Capital to Risk Weighted Assets 0.0850 0.0850
Tier 1 Capital (to average tangible assets)    
Tier 1 Leverage Capital $ 895,520 $ 569,678
Tier 1 Leverage Capital to Average Assets 0.0855 0.0853
Tier 1 Leverage Capital Required for Capital Adequacy $ 418,720 $ 267,286
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets 0.0400 0.0400
Plus Tier 1 Leverage Capital $ 418,720 $ 267,286
Plus Tier 1 Leverage Capital to Average Assets 0.0400 0.0400
Allegiance Bank    
Total Capital (to risk weighted assets)    
Capital $ 1,059,313 $ 659,596
Capital to Risk Weighted Assets 0.1202 0.1471
Capital Required for Capital Adequacy $ 705,120 $ 358,793
Capital Required for Capital Adequacy to Risk Weighted Assets 0.0800 0.0800
Plus Capital Conservation Buffer $ 925,470 $ 470,916
Plus Capital Conservation Buffer to Risk Weighted Assets 0.1050 0.1050
Capital Required to be Well Capitalized $ 881,400 $ 448,491
Capital Required to be Well Capitalized to Risk Weighted Assets 0.1000 0.1000
Common Equity Tier 1 Capital (to risk weighted assets)    
Common Equity Tier 1 Risk Based Capital $ 921,714 $ 566,483
Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets 10.46% 12.63%
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy $ 396,630 $ 201,821
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Plus Common Equity Tier 1 Risk Based Capital $ 616,980 $ 313,944
Plus Common Equity Tier 1 Risk Based Capital to Risk Weighted Assets 7.00% 7.00%
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized $ 572,910 $ 291,519
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital (to risk weighted assets)    
Tier 1 Risk Based Capital $ 921,714 $ 566,483
Tier 1 Risk Based Capital to Risk Weighted Assets 0.1046 0.1263
Tier 1 Risk Based Capital Required for Capital Adequacy $ 528,840 $ 269,095
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 0.0600 0.0600
Plus Tier 1 Risk Based Capital $ 749,190 $ 381,217
Plus Tier 1 Risk Based Capital to Risk Weighted Assets 0.0850 0.0850
Tier 1 Risk Based Capital Required to be Well Capitalized $ 705,120 $ 358,793
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 0.0800 0.0800
Tier 1 Capital (to average tangible assets)    
Tier 1 Leverage Capital $ 921,714 $ 566,483
Tier 1 Leverage Capital to Average Assets 0.0881 0.0849
Tier 1 Leverage Capital Required for Capital Adequacy $ 418,388 $ 266,944
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets 0.0400 0.0400
Plus Tier 1 Leverage Capital $ 418,388 $ 266,944
Plus Tier 1 Leverage Capital to Average Assets 0.0400 0.0400
Tier 1 Leverage Capital Required to be Well Capitalized $ 522,984 $ 333,680
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets 0.0500 0.0500