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PARENT COMPANY AND REGULATORY RESTRICTIONS (Required Capital and Capital Ratios) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leverage capital        
Actual Amount   $ 570,260 $ 578,607  
Actual Ratio   9.90% 10.40%  
Minimum amount required to be adequately capitalized   $ 230,847 $ 223,646  
Minimum ratio required to be adequately capitalized   4.00% 4.00%  
Tier 1 risk-based capital        
Actual Amount   $ 570,260 $ 578,607  
Actual Ratio   13.50% 14.70%  
Minimum amount required to be adequately capitalized   $ 252,921 $ 236,721  
Minimum ratio required to be adequately capitalized   6.00% 6.00%  
Total risk-based capital        
Actual Amount   $ 619,419 $ 628,068  
Actual Ratio   14.70% 15.90%  
Minimum amount required to be adequately capitalized   $ 337,228 $ 315,628  
Minimum ratio required to be adequately capitalized   8.00% 8.00%  
CET1 risk-based capital        
Actual Amount   $ 500,260 $ 490,861  
Actual Ratio   11.90% 12.40%  
Minimum amount required for capital adequacy purposes   $ 189,691 $ 177,541  
Minimum ratio required for capital adequacy purposes   4.50% 4.50%  
Capital Conservation Buffer, Year One       0.625%
Capital Conservation Buffer, Year Two     1.25%  
Capital Conservation Buffer, Year Three   1.875%    
Central Bank        
PARENT COMPANY AND REGULATORY RESTRICTIONS        
Equity in undistributed losses   $ (435,000)    
Retained earnings   46,600    
Leverage capital        
Actual Amount   $ 533,166 $ 565,412  
Actual Ratio   9.30% 10.10%  
Minimum amount required to be adequately capitalized   $ 230,638 $ 223,431  
Minimum ratio required to be adequately capitalized   4.00% 4.00%  
Minimum amount required to be well-capitalized   $ 288,298 $ 279,289  
Minimum ratio required to be well-capitalized   5.00% 5.00%  
Tier 1 risk-based capital        
Actual Amount   $ 533,166 $ 565,412  
Actual Ratio   12.70% 14.40%  
Minimum amount required to be adequately capitalized   $ 252,667 $ 236,401  
Minimum ratio required to be adequately capitalized   6.00% 6.00%  
Minimum amount required to be well-capitalized   $ 336,889 $ 315,201  
Minimum ratio required to be well-capitalized   8.00% 8.00%  
Total risk-based capital        
Actual Amount   $ 582,325 $ 614,732  
Actual Ratio   13.80% 15.60%  
Minimum amount required to be adequately capitalized   $ 336,889 $ 315,201  
Minimum ratio required to be adequately capitalized   8.00% 8.00%  
Minimum amount required to be well-capitalized   $ 421,111 $ 394,002  
Minimum ratio required to be well-capitalized   10.00% 10.00%  
CET1 risk-based capital        
Actual Amount   $ 533,166 $ 565,412  
Actual Ratio   12.70% 14.40%  
Minimum amount required for capital adequacy purposes   $ 189,500 $ 177,301  
Minimum ratio required for capital adequacy purposes   4.50% 4.50%  
Minimum amount equired to be well-capitalized   $ 273,722 $ 256,101  
Minimum ratio required to be well-capitalized   6.50% 6.50%  
Scenario        
CET1 risk-based capital        
Capital Conservation Buffer, Year Four 2.50%