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COMMITMENTS AND CONTINGENT LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Guarantor Obligations A summary of the Company’s commitments is as follows:
December 31,
(dollars in thousands)20212020
Commitments to extend credit$4,328,749 $2,826,719 
Unused home equity lines of credit272,029 259,015 
Financial standby letters of credit36,184 33,613 
Mortgage interest rate lock commitments417,126 1,199,939 
Financing Receivable, Allowance for Credit Loss The following table presents activity in the allowance for unfunded commitments for the periods presented.
Years Ended December 31,
(dollars in thousands)202120202019
Balance at beginning of period$32,853 $1,077 $— 
Adjustment to reflect adoption of ASU 2016-13— 12,714 — 
Addition due to acquisition— — 1,077 
Provision for unfunded commitments332 19,062 — 
Balance at end of period$33,185 $32,853 $1,077