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PARENT COMPANY AND REGULATORY RESTRICTIONS (Required Capital and Capital Ratios) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Leverage capital    
Actual Amount $ 562,460 $ 532,787
Actual Ratio 10.60% 10.70%
Minimum amount required to be adequately capitalized $ 211,383 $ 199,350
Minimum ratio required to be adequately capitalized 4.00% 4.00%
Minimum amount required to be well-capitalized $ 264,229 $ 249,187
Minimum ratio required to be well-capitalized 5.00% 5.00%
Tier 1 risk-based capital    
Actual Amount $ 562,460 $ 532,787
Actual Ratio 14.20% 14.40%
Minimum amount required to be adequately capitalized $ 237,157 $ 221,808
Minimum ratio required to be adequately capitalized 6.00% 6.00%
Minimum amount required to be well-capitalized $ 316,209 $ 295,745
Minimum ratio required to be well-capitalized 8.00% 8.00%
Total risk-based capital    
Actual Amount $ 612,202 $ 579,651
Actual Ratio 15.50% 15.70%
Minimum amount required to be adequately capitalized $ 316,209 $ 295,745
Minimum ratio required to be adequately capitalized 8.00% 8.00%
Minimum amount required to be well-capitalized $ 395,261 $ 369,681
Minimum ratio required to be well-capitalized 10.00% 10.00%
CET1 risk-based capital    
Actual Amount $ 485,268 $ 472,698
Actual Ratio 12.30% 12.80%
Minimum amount required for capital adequacy purposes $ 177,868 $ 166,356
Minimum ratio required for capital adequacy purposes 4.50% 4.50%
Minimum amount equired to be well-capitalized $ 256,920 $ 240,292
Minimum ratio required to be well-capitalized 6.50% 6.50%
Central Bank    
PARENT COMPANY AND REGULATORY RESTRICTIONS    
Equity in undistributed losses $ 397,700  
Retained earnings 83,900  
Leverage capital    
Actual Amount $ 541,577 $ 518,617
Actual Ratio 10.30% 10.40%
Minimum amount required to be adequately capitalized $ 211,135 $ 199,098
Minimum ratio required to be adequately capitalized 4.00% 4.00%
Minimum amount required to be well-capitalized $ 263,918 $ 248,872
Minimum ratio required to be well-capitalized 5.00% 5.00%
Tier 1 risk-based capital    
Actual Amount $ 541,577 $ 518,617
Actual Ratio 13.70% 14.10%
Minimum amount required to be adequately capitalized $ 236,806 $ 221,435
Minimum ratio required to be adequately capitalized 6.00% 6.00%
Minimum amount required to be well-capitalized $ 315,741 $ 295,247
Minimum ratio required to be well-capitalized 8.00% 8.00%
Total risk-based capital    
Actual Amount $ 591,185 $ 565,231
Actual Ratio 15.00% 15.30%
Minimum amount required to be adequately capitalized $ 315,741 $ 295,247
Minimum ratio required to be adequately capitalized 8.00% 8.00%
Minimum amount required to be well-capitalized $ 394,677 $ 369,058
Minimum ratio required to be well-capitalized 10.00% 10.00%
CET1 risk-based capital    
Actual Amount $ 541,577 $ 518,617
Actual Ratio 13.70% 14.10%
Minimum amount required for capital adequacy purposes $ 177,604 $ 166,076
Minimum ratio required for capital adequacy purposes 4.50% 4.50%
Minimum amount equired to be well-capitalized $ 256,540 $ 239,888
Minimum ratio required to be well-capitalized 6.50% 6.50%