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Commitments (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of Outstanding Commitments to Originate Loans and to Advance Additional Amounts The following table summarizes our outstanding commitments to originate loans and to advance additional amounts pursuant to outstanding letters of credit, lines of credit, and the undisbursed portion of construction loans as of December 31 of the years indicated.
Contract Amount
(dollars in thousands)
20192018
Standby letters of credit
$6,098  $4,288  
Available portion of lines of credit
247,670  186,446  
Undisbursed portion of loans in process
111,466  108,307  
Commitments to originate loans
87,446  92,656