SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Schedule of Actual and Required Capital Ratios (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Total capital to risk-weighted assets
Total capital to risk-weighted assets, Actual Amount	$ 1,371,740	$ 1,336,029
Total capital to risk-weighted assets, Actual Ratio	0.1436	0.1460
Total capital to risk-weighted assets, Minimum Capital Requirement, Amount	$ 764,130	$ 732,070
Total capital to risk-weighted assets, Minimum Capital Requirement, Ratio	0.0800	0.0800
Common Equity Tier 1 Capital to risk weighted assets
Common Equity Tier 1 Capital to risk weighted assets,Actual Amount	$ 1,149,620	$ 1,130,522
Common Equity Tier 1 Capital to risk weighted assets, Actual Ratio	0.1204	0.1235
Common equity tier 1 capital to risk weighted assets Minimum Capital Requirement , Amount	$ 429,823	$ 411,789
Common equity tier 1 capital to risk weighted assets Minimum Capital Requirement , Ratio	0.0450	0.0450
Common equity tier 1 capital to risk weighted assets Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio		0.0450
Tier 1 capital to risk-weighted assets
Tier 1 capital risk-weighted assets, Actual Amount	$ 1,171,957	$ 1,152,808
Tier 1 capital risk-weighted assets,Actual Ratio	0.1227	0.1260
Tier 1 capital risk-weighted assets,Minimum Capital Requirement, Amount	$ 573,098	$ 549,052
Tier 1 capital risk-weighted assets, Minimum Capital Requirement, Ratio	0.0600	0.0600
Tier 1 capital to average assets
Tier 1 capital to average assets, Actual Amount	$ 1,171,957	$ 1,152,808
Tier 1 capital to average assets,Actual Ratio	0.0965	0.1018
Tier 1 capital to average assets, Minimum Capital Requirement, Amount	$ 382,065	$ 366,035
Tier 1 capital to average assets, Minimum Capital Requirement, Ratio	0.0400	0.0400
Total risk-weighted assets	$ 9,551,627	$ 9,150,869
Subsidiaries
Total capital to risk-weighted assets
Total capital to risk-weighted assets, Actual Amount	$ 1,268,037	$ 1,239,722
Total capital to risk-weighted assets, Actual Ratio	0.1329	0.1356
Total capital to risk-weighted assets, Minimum Capital Requirement, Amount	$ 763,503	$ 731,259
Total capital to risk-weighted assets, Minimum Capital Requirement, Ratio	0.0800	0.0800
Total capital to risk-weighted assets,Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 954,379	$ 914,074
Total capital to risk-weighted assets, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.1000	0.1000
Common Equity Tier 1 Capital to risk weighted assets
Common Equity Tier 1 Capital to risk weighted assets,Actual Amount	$ 1,167,282	$ 1,155,280
Common Equity Tier 1 Capital to risk weighted assets, Actual Ratio	0.1223	0.1264
Common equity tier 1 capital to risk weighted assets Minimum Capital Requirement , Amount	$ 429,470	$ 411,333
Common equity tier 1 capital to risk weighted assets Minimum to be Well Capitalized Under Prompt Corrective Action Provisions ,Amount	$ 620,346	$ 594,148
Common equity tier 1 capital to risk weighted assets Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0650	0.0650
Tier 1 capital to risk-weighted assets
Tier 1 capital risk-weighted assets, Actual Amount	$ 1,167,282	$ 1,155,280
Tier 1 capital risk-weighted assets,Actual Ratio	0.1223	0.1264
Tier 1 capital risk-weighted assets,Minimum Capital Requirement, Amount	$ 572,627	$ 548,444
Tier 1 capital risk-weighted assets, Minimum Capital Requirement, Ratio	0.0600	0.0600
Tier 1 capital risk-weighted assets,Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 763,503	$ 731,259
Tier 1 capital risk-weighted assets, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0800	0.0800
Tier 1 capital to average assets
Tier 1 capital to average assets, Actual Amount	$ 1,167,282	$ 1,155,280
Tier 1 capital to average assets,Actual Ratio	0.0961	0.1020
Tier 1 capital to average assets, Minimum Capital Requirement, Amount	$ 381,751	$ 365,629
Tier 1 capital to average assets, Minimum Capital Requirement, Ratio	0.0400	0.0400
Tier 1 capital to average assets, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 477,189	$ 457,037
Tier 1 capital to average assets, minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0500	0.0500
Total risk-weighted assets	$ 9,543,786	$ 9,140,737