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SHAREHOLDERS' EQUITY - Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Consolidated    
Common Equity Tier 1 (to Risk Weighted Assets)    
Common Equity Tier 1 Capital $ 568,283 $ 570,610
Common Equity Tier 1 Capital for Capital Adequacy Purposes $ 173,174 $ 175,216
Common Equity Tier 1 (to Risk Weighted Assets) Ratios [Abstract]    
Common Equity Tier 1 Capital to Risk Weighted Assets 14.77% 14.65%
Common Equity TIer 1 Required for Capital Adequacy Purposes to Risk Weighted Assets 4.50% 4.50%
Tier 1 Capital (to Risk Weighted Assets)    
Tier 1 Capital $ 626,718 $ 627,532
Tier 1 Capital Required for Capital Adequacy Purposes $ 230,899 $ 233,621
Tier 1 Capital (to Risk Weighted Assets) Ratios    
Tier 1 Capital to Risk Weighted Assets 16.29% 16.12%
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets 6.00% 6.00%
Total Capital (to Risk Weighted Assets)    
Total Capital $ 754,034 $ 748,532
Total Capital Required for Capital Adequacy Purposes $ 307,865 $ 311,495
Total Capital (to Risk Weighted Assets) Ratios    
Total Capital to Risk Weighted Assets 19.59% 19.22%
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets 8.00% 8.00%
Tier 1 Capital (to Average Assets)    
Tier 1 Capital [1] $ 626,718 $ 627,532
Tier 1 Capital Required for Capital Adequacy Purposes [1] $ 235,689 $ 224,844
Tier 1 Capital (to Average Assets) Ratios    
Tier 1 Capital to Average Assets [1] 10.64% 11.16%
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets [1] 4.00% 4.00%
Bank Only    
Common Equity Tier 1 (to Risk Weighted Assets)    
Common Equity Tier 1 Capital $ 714,991 $ 711,157
Common Equity Tier 1 Capital for Capital Adequacy Purposes 173,095 175,145
Common Equity Tier 1 Capital to be Well Capitalized $ 250,026 $ 252,987
Common Equity Tier 1 (to Risk Weighted Assets) Ratios [Abstract]    
Common Equity Tier 1 Capital to Risk Weighted Assets 18.59% 18.27%
Common Equity TIer 1 Required for Capital Adequacy Purposes to Risk Weighted Assets 4.50% 4.50%
Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Tier 1 Capital (to Risk Weighted Assets)    
Tier 1 Capital $ 714,991 $ 711,157
Tier 1 Capital Required for Capital Adequacy Purposes 230,793 233,527
Tier 1 Capital Required to be Well Capitalized $ 307,725 $ 311,369
Tier 1 Capital (to Risk Weighted Assets) Ratios    
Tier 1 Capital to Risk Weighted Assets 18.59% 18.27%
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets 6.00% 6.00%
Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Total Capital (to Risk Weighted Assets)    
Total Capital $ 743,900 $ 733,909
Total Capital Required for Capital Adequacy Purposes 307,725 311,369
Total Capital Required to be Well Capitalized $ 384,656 $ 389,211
Total Capital (to Risk Weighted Assets) Ratios    
Total Capital to Risk Weighted Assets 19.34% 18.86%
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets 8.00% 8.00%
Total Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier 1 Capital (to Average Assets)    
Tier 1 Capital [1] $ 714,991 $ 711,157
Tier 1 Capital Required for Capital Adequacy Purposes [1] 235,532 224,741
Tier 1 Capital Required to be Well Capitalized [1] $ 294,415 $ 280,926
Tier 1 Capital (to Average Assets) Ratios    
Tier 1 Capital to Average Assets [1] 12.14% 12.66%
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets [1] 4.00% 4.00%
Tier 1 Capital Required to be Well Capitalized to Average Assets [1] 5.00% 5.00%
[1] Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies.