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Commitments and contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Summary of Financial instruments with Off-Balance Sheet Credit Risk
September 30,December 31,
 2020 2019 
Commitments to extend credit, excluding interest rate lock commitments$1,819,070 $1,086,173 
Letters of credit18,239 19,569 
Balance at end of period$1,837,309 $1,105,742 
Summary of Allowance of Credit Losses on Unfunded Commitments
The table below presents activity within the allowance for credit losses on unfunded commitments:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
2020 2020 
Balance at beginning of period$6,500 $— 
Impact of CECL adoption on provision for credit losses on unfunded commitments— 2,947 
Increase in allowance for credit losses from unfunded commitments acquired in business combination10,429 10,499 
Provision for credit losses on unfunded commitments(862)2,621 
Balance at end of period$16,067 $16,067 
Summary of Allowance for Loan Repurchases or Indemnifications
The following table summarizes the activity in the repurchase reserve:
Three Months Ended September 30,For the Nine Months Ended September 30,
 2020 2019 2020 2019 
Balance at beginning of period$4,601 $3,407 $3,529 $3,273 
Provision for loan repurchases or indemnifications901 107 2,128 255 
Recoveries on previous losses(44)(79)(199)(93)
Balance at end of period$5,458 $3,435 $5,458 $3,435