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PARENT COMPANY AND REGULATORY RESTRICTIONS (Required Capital and Capital Ratios) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leverage capital          
Actual Amount   $ 568,529 $ 570,260    
Actual Ratio   9.50% 9.90%    
Minimum amount required to be adequately capitalized   $ 238,630 $ 230,847    
Minimum ratio required to be adequately capitalized   4.00% 4.00%    
Tier 1 risk-based capital          
Actual Amount   $ 568,529 $ 570,260    
Actual Ratio   12.60% 13.50%    
Minimum amount required to be adequately capitalized   $ 271,788 $ 252,921    
Minimum ratio required to be adequately capitalized   6.00% 6.00%    
Total risk-based capital          
Actual Amount   $ 617,772 $ 619,419    
Actual Ratio   13.60% 14.70%    
Minimum amount required to be adequately capitalized   $ 362,384 $ 337,228    
Minimum ratio required to be adequately capitalized   8.00% 8.00%    
CET1 risk-based capital          
Actual Amount   $ 518,529 $ 500,260    
Actual Ratio   11.50% 11.90%    
Minimum amount required for capital adequacy purposes   $ 203,841 $ 189,691    
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   2.50%      
Capital Conservation Buffer, Year Four 2.50%        
Central Bank          
PARENT COMPANY AND REGULATORY RESTRICTIONS          
Equity in undistributed losses   $ (415,000)      
Retained earnings   66,600      
Leverage capital          
Actual Amount   $ 556,077 $ 533,166    
Actual Ratio   9.30% 9.30%    
Minimum amount required to be adequately capitalized   $ 238,342 $ 230,638    
Minimum ratio required to be adequately capitalized   4.00% 4.00%    
Minimum amount required to be well-capitalized   $ 297,928 $ 288,298    
Minimum ratio required to be well-capitalized   5.00% 5.00%    
Tier 1 risk-based capital          
Actual Amount   $ 556,077 $ 533,166    
Actual Ratio   12.30% 12.70%    
Minimum amount required to be adequately capitalized   $ 271,350 $ 252,667    
Minimum ratio required to be adequately capitalized   6.00% 6.00%    
Minimum amount required to be well-capitalized   $ 361,800 $ 336,889    
Minimum ratio required to be well-capitalized   8.00% 8.00%    
Total risk-based capital          
Actual Amount   $ 605,320 $ 582,325    
Actual Ratio   13.40% 13.80%    
Minimum amount required to be adequately capitalized   $ 361,800 $ 336,889    
Minimum ratio required to be adequately capitalized   8.00% 8.00%    
Minimum amount required to be well-capitalized   $ 452,250 $ 421,111    
Minimum ratio required to be well-capitalized   10.00% 10.00%    
CET1 risk-based capital          
Actual Amount   $ 556,077 $ 533,166    
Actual Ratio   12.30% 12.70%    
Minimum amount required for capital adequacy purposes   $ 203,512 $ 189,500    
Minimum ratio required for capital adequacy purposes   4.50% 4.50%    
Minimum amount equired to be well-capitalized   $ 293,962 $ 273,722    
Minimum ratio required to be well-capitalized   6.50% 6.50%