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PARENT COMPANY AND REGULATORY RESTRICTIONS (Required Capital and Capital Ratios) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Leverage capital    
Actual Amount $ 578,607 $ 562,460
Actual Ratio 10.40% 10.60%
Minimum amount required to be adequately capitalized $ 223,646 $ 211,383
Minimum ratio required to be adequately capitalized 4.00% 4.00%
Minimum amount required to be well-capitalized $ 279,557 $ 264,229
Minimum ratio required to be well-capitalized 5.00% 5.00%
Tier 1 risk-based capital    
Actual Amount $ 578,607 $ 562,460
Actual Ratio 14.70% 14.20%
Minimum amount required to be adequately capitalized $ 236,721 $ 237,157
Minimum ratio required to be adequately capitalized 6.00% 6.00%
Minimum amount required to be well-capitalized $ 315,628 $ 316,209
Minimum ratio required to be well-capitalized 8.00% 8.00%
Total risk-based capital    
Actual Amount $ 628,068 $ 612,202
Actual Ratio 15.90% 15.50%
Minimum amount required to be adequately capitalized $ 315,628 $ 316,209
Minimum ratio required to be adequately capitalized 8.00% 8.00%
Minimum amount required to be well-capitalized $ 394,535 $ 395,261
Minimum ratio required to be well-capitalized 10.00% 10.00%
CET1 risk-based capital    
Actual Amount $ 490,861 $ 485,268
Actual Ratio 12.40% 12.30%
Minimum amount required for capital adequacy purposes $ 177,541 $ 177,868
Minimum ratio required for capital adequacy purposes 4.50% 4.50%
Minimum amount equired to be well-capitalized $ 256,448 $ 256,920
Minimum ratio required to be well-capitalized 6.50% 6.50%
Central Bank    
PARENT COMPANY AND REGULATORY RESTRICTIONS    
Equity in undistributed losses $ (396,000)  
Retained earnings 85,600  
Leverage capital    
Actual Amount $ 565,412 $ 541,577
Actual Ratio 10.10% 10.30%
Minimum amount required to be adequately capitalized $ 223,431 $ 211,135
Minimum ratio required to be adequately capitalized 4.00% 4.00%
Minimum amount required to be well-capitalized $ 279,289 $ 263,918
Minimum ratio required to be well-capitalized 5.00% 5.00%
Tier 1 risk-based capital    
Actual Amount $ 565,412 $ 541,577
Actual Ratio 14.40% 13.70%
Minimum amount required to be adequately capitalized $ 236,401 $ 236,806
Minimum ratio required to be adequately capitalized 6.00% 6.00%
Minimum amount required to be well-capitalized $ 315,201 $ 315,741
Minimum ratio required to be well-capitalized 8.00% 8.00%
Total risk-based capital    
Actual Amount $ 614,732 $ 591,185
Actual Ratio 15.60% 15.00%
Minimum amount required to be adequately capitalized $ 315,201 $ 315,741
Minimum ratio required to be adequately capitalized 8.00% 8.00%
Minimum amount required to be well-capitalized $ 394,002 $ 394,677
Minimum ratio required to be well-capitalized 10.00% 10.00%
CET1 risk-based capital    
Actual Amount $ 565,412 $ 541,577
Actual Ratio 14.40% 13.70%
Minimum amount required for capital adequacy purposes $ 177,301 $ 177,604
Minimum ratio required for capital adequacy purposes 4.50% 4.50%
Minimum amount equired to be well-capitalized $ 256,101 $ 256,540
Minimum ratio required to be well-capitalized 6.50% 6.50%