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PARENT COMPANY AND REGULATORY RESTRICTIONS (Required Capital and Capital Ratios) (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Dec. 31, 2018
Leverage capital          
Actual Amount   $ 622,130 $ 581,358    
Actual Ratio   0.085 0.088    
Minimum amount required to be adequately capitalized   $ 293,382 $ 263,979    
Minimum ratio required to be adequately capitalized   0.040 0.040    
Tier 1 risk-based capital          
Actual Amount   $ 622,130 $ 581,358    
Actual Ratio   0.122 0.129    
Minimum amount required to be adequately capitalized   $ 307,215 $ 271,027    
Minimum ratio required to be adequately capitalized   0.060 0.060    
Total risk-based capital          
Actual Amount   $ 741,291 $ 686,130    
Actual Ratio   0.145 0.152    
Minimum amount required to be adequately capitalized   $ 409,620 $ 361,369    
Minimum ratio required to be adequately capitalized   0.080 0.080    
CET1 risk-based capital          
Actual Amount   $ 572,130 $ 531,358    
Actual Ratio   11.20% 11.80%    
Minimum amount required for capital adequacy purposes   $ 230,411 $ 203,270    
Minimum ratio required for capital adequacy purposes   4.50% 4.50%    
Capital Conservation Buffer, Year One       1.25% 0.625%
Capital Conservation Buffer, Year Two     1.875%    
Capital Conservation Buffer, Year Three 0.025% 2.50%      
Capital Conservation Buffer, Year Four 2.50%        
Central Bank          
PARENT COMPANY AND REGULATORY RESTRICTIONS          
Equity in undistributed losses   $ (371,200)      
Retained earnings   114,000      
Leverage capital          
Actual Amount   $ 652,987 $ 620,372    
Actual Ratio   0.089 0.094    
Minimum amount required to be adequately capitalized   $ 292,877 $ 263,735    
Minimum ratio required to be adequately capitalized   0.040 0.040    
Minimum amount required to be well-capitalized   $ 366,096 $ 329,668    
Minimum ratio required to be well-capitalized   0.050 0.050    
Tier 1 risk-based capital          
Actual Amount   $ 652,987 $ 620,372    
Actual Ratio   0.128 0.137    
Minimum amount required to be adequately capitalized   $ 306,497 $ 270,820    
Minimum ratio required to be adequately capitalized   0.060 0.060    
Minimum amount required to be well-capitalized   $ 408,663 $ 361,094    
Minimum ratio required to be well-capitalized   0.080 0.080    
Total risk-based capital          
Actual Amount   $ 717,000 $ 670,087    
Actual Ratio   0.140 0.149    
Minimum amount required to be adequately capitalized   $ 408,663 $ 361,094    
Minimum ratio required to be adequately capitalized   0.080 0.080    
Minimum amount required to be well-capitalized   $ 510,828 $ 451,367    
Minimum ratio required to be well-capitalized   0.100 0.100    
CET1 risk-based capital          
Actual Amount   $ 652,987 $ 620,372    
Actual Ratio   12.80% 13.70%    
Minimum amount required for capital adequacy purposes   $ 229,873 $ 203,115    
Minimum ratio required for capital adequacy purposes   4.50% 4.50%    
Minimum amount equired to be well-capitalized   $ 332,038 $ 293,389    
Minimum ratio required to be well-capitalized   6.50% 6.50%