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REGULATORY MATTERS - Regulatory Capital (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 15, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 16, 2021
Common Equity Tier I to RiskWeighted Assets              
Dividend restrictions term       2 years      
Actual amount   $ 487,717,000   $ 487,717,000   $ 475,154,000  
Common Equity Tier One Capital Ratio   0.1405   0.1405   0.1531  
Capital conversion buffer (as a percent)   2.50%   2.50%      
Minimum Capital Required Basel III (amount)   $ 243,053,000   $ 243,053,000   $ 217,300,000  
Minimum Capital RequiredBasel III (ratio)   0.0700   0.0700   0.0700  
Required to be Considered Well Capitalized, ratio   4.5   4.5      
Tier I Capital to RiskWeighted Assets              
Actual amount   $ 487,717,000   $ 487,717,000   $ 475,154,000  
Actual ratio   0.1405   0.1405   0.1531  
Minimum Capital Required for Capital Adequacy Purposes (amount)   $ 7.0   $ 7.0      
Minimum Capital Required for Capital Adequacy Purposes (ratio)   6.00%   6.00%   4.50%  
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 295,135,000   $ 295,135,000   $ 263,864,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.0850   0.0850   0.085  
Required to be Considered Well Capitalized, ratio   0.080   0.080      
Total Capital to RiskWeighted Assets              
Actual amount   $ 524,112,000   $ 524,112,000   $ 509,766,000  
Actual ratio   0.1509   0.1509   0.1642  
Minimum Capital Required for Capital Adequacy Purposes (ratio)   8.00%   8.00%      
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 364,579,000   $ 364,579,000   $ 325,950,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.1050   0.1050   0.105  
Leverage Ratio              
Actual amount   $ 487,717,000   $ 487,717,000   $ 475,154,000  
Actual ratio   0.1142   0.1142   0.1122  
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 170,891,000   $ 170,891,000   $ 169,470,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.040   0.040   0.0400  
Regulatory fees in the consolidated statements of income   $ 599,000 $ 478,000 $ 2,016,000 $ 1,535,000    
Subsidiaries [Member]              
Common Equity Tier I to RiskWeighted Assets              
Actual amount   $ 479,175,000   $ 479,175,000   $ 447,819,000  
Common Equity Tier One Capital Ratio   0.1381   0.1381   0.1443  
Minimum Capital Required Basel III (amount)   $ 242,969,000   $ 242,969,000   $ 217,270,000  
Minimum Capital RequiredBasel III (ratio)   0.0700   0.0700   0.0700  
Required to be Considered Well Capitalized, amount   $ 225,614,000   $ 225,614,000   $ 201,757,000  
Required to be Considered Well Capitalized, ratio   0.0650   0.0650   0.0650  
Tier I Capital to RiskWeighted Assets              
Actual amount   $ 479,175,000   $ 479,175,000   $ 447,819,000  
Actual ratio   0.1381   0.1381   0.1443  
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 295,034,000   $ 295,034,000   $ 263,836,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.0850   0.0850   0.0850  
Required to be Considered Well Capitalized, amount   $ 277,679,000   $ 277,679,000   $ 248,316,000  
Required to be Considered Well Capitalized, ratio   0.0800   0.0800   0.0800  
Total Capital to RiskWeighted Assets              
Actual amount   $ 515,570,000   $ 515,570,000   $ 482,431,000  
Actual ratio   0.1485   0.1485   0.1554  
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 364,454,000   $ 364,454,000   $ 325,915,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.1050   0.1050   0.1050  
Required to be Considered Well Capitalized, amount   $ 347,099,000   $ 347,099,000   $ 310,395,000  
Required to be Considered Well Capitalized, ratio   0.1000   0.1000   0.1000  
Leverage Ratio              
Actual amount   $ 479,175,000   $ 479,175,000   $ 447,819,000  
Actual ratio   0.1122   0.1122   0.1058  
Minimum Capital RequiredBasel III Fully Phasedin (amount)   $ 170,856,000   $ 170,856,000   $ 169,381,000  
Minimum Capital RequiredBasel III Fully Phasedin (ratio)   0.0400   0.0400   0.0400  
Required to be Considered Well Capitalized, amount   $ 213,570,000   $ 213,570,000   $ 211,726,000  
Required to be Considered Well Capitalized, ratio   0.0500   0.0500   0.0500  
OCC Consent Order              
Leverage Ratio              
Civil money penalty             $ 1,000,000.0
FinCEN Consent Order              
Leverage Ratio              
Civil money penalty $ 8,000,000.0            
Penalty paid (credited) (1,000,000.0)            
OCC and Fincen Consent Order [Member]              
Leverage Ratio              
Regulatory fees in the consolidated statements of income $ 8,000,000.0