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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Summary Of Capital Adequacy Requirements (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Consolidated Entities [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk Weighted Assets), Actual Amount | $ 682,778 | $ 631,723
Total Capital (to Risk Weighted Assets), Actual Ratio | 14.65 | 14.36
Tier I Capital (to Risk Weighted Assets), Actual Amount | $ 624,381 | $ 580,982
Tier I Capital (to Risk Weighted Assets), Actual Ratio | 13.39 | 13.21
Common Equity Tier 1 (CET1), Actual Amount | $ 624,381 | $ 580,982
Common Equity Tier 1 (CET1), Actual Ratio | 13.39% | 13.21%
Tier I Capital (to Average Assets), Actual Amount | $ 624,381 | $ 580,982
Tier I Capital (to Average Assets), Actual Ratio | 10.93 | 11.67
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 372,921 | $ 351,894
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Ratio | 8.00 | 8.00
Tier I Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 279,691 | $ 263,921
Tier I Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Ratio | 6.00 | 6.00
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Amount | $ 209,768 | $ 197,941
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Ratio | 4.50% | 4.50%
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 228,406 | $ 199,099
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Ratio | 4.00 | 4.00
Excess Capital, For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | $ 489,459 | $ 461,862
Tier I Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | 396,229 | 373,887
Common Equity Tier 1 (CET1), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | 326,306 | 307,908
Tier I Capital (to Average Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | 228,406 | 199,099
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital (to Risk Weighted Assets), Actual Amount | $ 678,034 | $ 616,386
Total Capital (to Risk Weighted Assets), Actual Ratio | 14.56 | 14.04
Tier I Capital (to Risk Weighted Assets), Actual Amount | $ 619,693 | $ 565,645
Tier I Capital (to Risk Weighted Assets), Actual Ratio | 13.31 | 12.88
Common Equity Tier 1 (CET1), Actual Amount | $ 619,693 | $ 565,645
Common Equity Tier 1 (CET1), Actual Ratio | 13.31% | 12.88%
Tier I Capital (to Average Assets), Actual Amount | $ 619,693 | $ 565,645
Tier I Capital (to Average Assets), Actual Ratio | 10.88 | 11.43
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 372,560 | $ 351,227
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Ratio | 8.00 | 8.00
Tier I Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 279,420 | $ 263,420
Tier I Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Ratio | 6.00 | 6.00
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Amount | $ 209,565 | $ 197,565
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Ratio | 4.50% | 4.50%
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Amount | $ 227,900 | $ 197,923
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Ratio | 4.00 | 4.00
Excess Capital, For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | $ 488,985 | $ 460,985
Excess Capital to Risk Weighted Assets, For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio | 10.50 | 10.50
Tier I Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | $ 395,845 | $ 373,179
Tier I Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio | 8.50 | 8.50
Common Equity Tier 1 (CET1), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | $ 325,990 | $ 307,324
Common Equity Tier 1 (CET1), For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio | 7.00% | 7.00%
Tier I Capital (to Average Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount | $ 227,900 | $ 197,923
Tier I Capital (to Average Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio | 4.00 | 4.00
Total Capital (to Risk Weighted Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Amount | $ 465,700 | $ 439,034
Total Capital (to Risk Weighted Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio | 10.00 | 10.00
Tier I Capital (to Risk Weighted Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Amount | $ 372,560 | $ 351,227
Tier I Capital (to Risk Weighted Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio | 8.00 | 8.00
Common Equity Tier 1 (CET1), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Amount | $ 302,705 | $ 285,372
Common Equity Tier 1 (CET1), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio | 6.50% | 6.50%
Tier I Capital (to Average Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Amount | $ 284,875 | $ 247,404
Tier I Capital (to Average Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio | 5.00 | 5.00

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