COMMITMENTS AND CONTINGENCIES - Summary of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial instruments with contract amounts which represent potential credit risk:
Total	$ 2,489,295	$ 2,351,630
Commercial mortgage loan commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	91,871	100,729
Commercial loan commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	1,088,098	1,083,512
Owner-occupied commercial commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	74,846	70,155
Commercial standby letters of credit
Financial instruments with contract amounts which represent potential credit risk:
Total	92,048	95,897
Residential loan commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	6,815	2,842
Consumer loan commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	731,850	591,856
Construction loan commitments
Financial instruments with contract amounts which represent potential credit risk:
Total	$ 403,767	$ 406,639