Commitments and contingencies (Tables)

9 Months Ended

Sep. 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.

	September 30,		December 31,
	2019		2018
Commitments to extend credit, excluding interest rate lock commitments	$	1,188,160	$	1,032,390
Letters of credit	22,376		19,024
Balance at end of period	$	1,210,536	$	1,051,414

Summary of Allowance for Loan Repurchases or Indemnifications

The following table summarizes the activity in the repurchase reserve:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Balance at beginning of period	$	3,407		$	3,646		$	3,273		$	3,386
Provision for loan repurchases or indemnifications	107			206			255			598
Recoveries on previous losses	(79		)	(115		)	(93		)	(247		)
Balance at end of period	$	3,435		$	3,737		$	3,435		$	3,737