LOANS AND LEASES (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 136,330	$ 94,507	$ 204,818	$ 228,804
Net loans and leases	11,197,482	7,791,482
Reverse mortgage, fair value	4,300	3,900	9,400
Accrued interest receivable on loans and leases	40,800	31,600
Financing Receivable Portfolio Segment, Including Reverse Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	11,333,812	7,885,989
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	809,610	546,667
Allowance for credit losses	4,956	3,352	5,702	6,893
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,382,116	1,158,573
Allowance for credit losses	33,283	23,088	18,797	18,160
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,493,528	1,918,043
Allowance for credit losses	65,716	49,967	125,870	150,875
Owner-occupied commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,872,827	1,341,707
Allowance for credit losses	6,125	4,574	9,617	9,615
Commercial mortgages | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,361,242	1,881,510
Allowance for credit losses	23,105	11,623	30,545	31,071
Construction | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	923,890	687,213
Allowance for credit losses	3,145	1,903	$ 14,287	$ 12,190
Commercial small business leases | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	490,599	352,276
PPP loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 8,500	$ 31,500