CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Summary Of Capital Adequacy Requirements (Details) $ in Thousands	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Consolidated
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets), Actual Amount	$ 744,421	$ 682,778
Total Capital (to Risk Weighted Assets), Actual Ratio	15.35	14.65
Tier I Capital (to Risk Weighted Assets), Actual Amount	$ 683,754	$ 624,381
Tier I Capital (to Risk Weighted Assets), Actual Ratio	14.10	13.39
Common Equity Tier 1 (CET1), Actual Amount	$ 683,754	$ 624,381
Common Equity Tier 1 (CET1), Actual Ratio	1410.00%	1339.00%
Tier I Capital (to Average Assets), Actual Amount	$ 683,754	$ 624,381
Tier I Capital (to Average Assets), Actual Ratio	10.73	10.93
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount	$ 388,020	$ 372,921
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	$ 291,015	$ 279,691
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	$ 218,261	$ 209,768
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Ratio	450.00%	450.00%
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Amount	$ 254,898	$ 228,406
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	$ 509,276	$ 489,459
Tier I Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount	412,271	396,229
Common Equity Tier 1 (CET1), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount	339,518	326,306
Tier I Capital (to Average Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount	254,898	228,406
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets), Actual Amount	$ 726,091	$ 678,034
Total Capital (to Risk Weighted Assets), Actual Ratio	15.01	14.56
Tier I Capital (to Risk Weighted Assets), Actual Amount	$ 665,424	$ 619,693
Tier I Capital (to Risk Weighted Assets), Actual Ratio	13.75	13.31
Common Equity Tier 1 (CET1), Actual Amount	$ 665,424	$ 619,693
Common Equity Tier 1 (CET1), Actual Ratio	1375.00%	1331.00%
Tier I Capital (to Average Assets), Actual Amount	$ 665,424	$ 619,693
Tier I Capital (to Average Assets), Actual Ratio	10.46	10.88
Total Capital (to Risk Weighted Assets), Minimum Required For Capital Adequacy Purposes Amount	$ 387,118	$ 372,560
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	$ 290,339	$ 279,420
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	$ 217,754	$ 209,565
Common Equity Tier 1 (CET1), Minimum Required For Capital Adequacy Purposes Ratio	450.00%	450.00%
Tier I Capital (to Average Assets), Minimum Required For Capital Adequacy Purposes Amount	$ 254,425	$ 227,900
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	$ 508,093	$ 488,985
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	$ 411,313	$ 395,845
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	$ 338,729	$ 325,990
Common Equity Tier 1 (CET1), For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio	700.00%	700.00%
Tier I Capital (to Average Assets), For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount	$ 254,425	$ 227,900
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	$ 483,898	$ 465,700
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	$ 387,118	$ 372,560
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	$ 314,534	$ 302,705
Common Equity Tier 1 (CET1), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	650.00%	650.00%
Tier I Capital (to Average Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 318,030	$ 284,875
Tier I Capital (to Average Assets), Minimum Required to Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	5.00	5.00