REGULATORY MATTERS - Actual Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Company (Consolidated)
Common equity Tier 1 (Ratio)
Total risk-based	$ 753,708	$ 662,658
Common equity Tier 1	570,660	488,290
Tier 1 risk-based	586,068	503,644
Tier 1 leverage	$ 586,068	$ 503,644
Total risk-based, ratio	0.167	0.186
Common equity Tier 1, ratio	12.70%	13.70%
Tier I risk-based, ratio	0.130	0.141
Tier I leverage, ratio	0.093	0.092
Subsidiary The First
Common equity Tier 1 (Ratio)
Total risk-based	$ 739,616	$ 618,472
Common equity Tier 1	701,099	588,334
Tier 1 risk-based	701,099	588,334
Tier 1 leverage	$ 701,099	$ 588,334
Total risk-based, ratio	0.164	0.174
Common equity Tier 1, ratio	15.60%	16.60%
Tier I risk-based, ratio	0.156	0.166
Tier I leverage, ratio	0.111	0.108