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COMMITMENTS AND CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Guarantor Obligations A summary of the Company’s commitments is as follows:
(dollars in thousands)September 30, 2020December 31, 2019
Commitments to extend credit$2,340,433 $2,486,949 
Unused home equity lines of credit259,421 262,089 
Financial standby letters of credit33,087 29,232 
Mortgage interest rate lock commitments1,658,214 288,490 
Schedule of Allowance for Credit Loss for Unfunded Commitments The following table presents activity in the allowance for unfunded commitments for the periods presented:
Three Months Ended September 30,Nine Months Ended September 30,
(dollars in thousands)2020201920202019
Balance at beginning of period$37,503 $— $1,077 $— 
Adjustment to reflect adoption of ASU 2016-13— — 12,714 — 
Addition due to acquisition— 1,077 — 1,077 
Provision for unfunded commitments(10,131)— 13,581 — 
Balance at end of period$27,372 $1,077 $27,372 $1,077