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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off Balance Sheet Risk The following table presents the contractual and notional amounts of financial instruments with off-balance sheet risk:
(Dollars in thousands)
December 31,20202019
Financial instruments whose contract amounts represent credit risk:
Commitments to extend credit:
Commercial loans
$453,493 $471,338 
Home equity lines
319,744 295,687 
Other loans
89,078 88,613 
Standby letters of credit11,709 13,710 
Financial instruments whose notional amounts exceed the amount of credit risk:
Mortgage loan commitments:
Interest rate lock commitments
167,671 51,439 
Forward sale commitments
279,653 94,829 
Loan related derivative contracts:
Interest rate swaps with customers
991,002 813,458 
Mirror swaps with counterparties
991,002 813,458 
Risk participation-in agreements
92,717 72,866 
Interest rate risk management contracts:
Interest rate swaps
60,000 60,000 
Allowance for Credit Losses on Unfunded Commitment
The activity in the ACL on unfunded commitments for the year ended December 31, 2020 is presented below:
(Dollars in thousands)CommercialConsumer
CREC&ITotal CommercialResidential Real EstateHome EquityOtherTotal ConsumerTotal
Beginning Balance$136 $144 $280 $6 $— $7 $7 $293 
Adoption of ASC 326817 626 1,443 34 — 6 6 1,483 
Provision(46)632 586 14 — 6 6 606 
Ending Balance$907 $1,402 $2,309 $54 $— $19 $19 $2,382