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SHAREHOLDERS' EQUITY - Regulatory Capital Requirements (Details) $ in Thousands		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Consolidated
Common Equity Tier 1 (to Risk Weighted Assets)
Common Equity Tier 1 Capital		$ 690,296	$ 687,686
Common Equity Tier 1 Capital for Capital Adequacy Purposes		$ 252,954	$ 245,107
Common Equity Tier 1 (to Risk Weighted Assets) Ratios [Abstract]
Common Equity Tier 1 Capital to Risk Weighted Assets		0.1228	0.1263
Common Equity Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0450	0.0450
Tier 1 Capital (to Risk Weighted Assets)
Tier 1 Capital		$ 748,755	$ 746,140
Tier 1 Capital Required for Capital Adequacy Purposes		$ 337,273	$ 326,809
Tier 1 Capital (to Risk Weighted Assets) Ratios
Tier 1 Capital to Risk Weighted Assets		0.1332	0.1370
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0600	0.0600
Total Capital (to Risk Weighted Assets)
Total Capital		$ 884,095	$ 877,281
Total Capital Required for Capital Adequacy Purposes		$ 449,697	$ 435,746
Total Capital (to Risk Weighted Assets) Ratios
Total Capital to Risk Weighted Assets		0.1573	0.1611
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0800	0.0800
Tier 1 Capital (to Average Assets)
Tier 1 Capital	[1]	$ 748,755	$ 746,140
Tier 1 Capital Required for Capital Adequacy Purposes	[1]	$ 318,906	$ 299,511
Tier 1 Capital (to Average Assets) Ratios
Tier 1 Capital to Average Assets	[1]	0.0939	0.0996
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets	[1]	0.0400	0.0400
Bank Only
Common Equity Tier 1 (to Risk Weighted Assets)
Common Equity Tier 1 Capital		$ 836,228	$ 823,323
Common Equity Tier 1 Capital for Capital Adequacy Purposes		252,865	245,085
Common Equity Tier 1 Capital to be Well Capitalized		$ 365,249	$ 354,012
Common Equity Tier 1 (to Risk Weighted Assets) Ratios [Abstract]
Common Equity Tier 1 Capital to Risk Weighted Assets		0.1488	0.1512
Common Equity Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0450	0.0450
Common Equity Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets		0.0650	0.0650
Tier 1 Capital (to Risk Weighted Assets)
Tier 1 Capital		$ 836,228	$ 823,323
Tier 1 Capital Required for Capital Adequacy Purposes		337,153	326,780
Tier 1 Capital Required to be Well Capitalized		$ 449,537	$ 435,707
Tier 1 Capital (to Risk Weighted Assets) Ratios
Tier 1 Capital to Risk Weighted Assets		0.1488	0.1512
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0600	0.0600
Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets		0.0800	0.0800
Total Capital (to Risk Weighted Assets)
Total Capital		$ 877,691	$ 855,790
Total Capital Required for Capital Adequacy Purposes		449,537	435,707
Total Capital Required to be Well Capitalized		$ 561,922	$ 544,633
Total Capital (to Risk Weighted Assets) Ratios
Total Capital to Risk Weighted Assets		0.1562	0.1571
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		0.0800	0.0800
Total Capital Required to be Well Capitalized to Risk Weighted Assets		0.1000	0.1000
Tier 1 Capital (to Average Assets)
Tier 1 Capital	[1]	$ 836,228	$ 823,323
Tier 1 Capital Required for Capital Adequacy Purposes	[1]	318,814	299,410
Tier 1 Capital Required to be Well Capitalized	[1]	$ 398,517	$ 374,263
Tier 1 Capital (to Average Assets) Ratios
Tier 1 Capital to Average Assets	[1]	0.1049	0.1100
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets	[1]	0.0400	0.0400
Tier 1 Capital Required to be Well Capitalized to Average Assets	[1]	0.0500	0.0500
[1] Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies.

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