Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Summary of Financial instruments with Off-Balance Sheet Credit Risk

The same credit policies are used to make such commitments as are used for loans, including obtaining collateral at exercise of the commitment.

	June 30,		December 31,
	2019		2018
Commitments to extend credit, excluding interest rate lock commitments	$	1,191,641	$	1,032,390
Letters of credit	17,525		19,024
Balance at end of period	$	1,209,166	$	1,051,414

Summary of Allowance for Loan Repurchases or Indemnifications

In connection with the sale of mortgage loans to third party investors,