Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2018

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.

	December 31,
	2018		2017
Commitments to extend credit, excluding interest rate lock commitments	$	1,032,390	$	977,276
Letters of credit	19,024		22,882
Balance at end of period	$	1,051,414	$	1,000,158

Summary of Commitments Under Non-Cancelable Operating Leases

Commitments under non-cancelable operating leases were as follows, before considering renewal options that generally are present:

2019	$	4,328
2020	3,780
2021	3,548
2022	2,542
2023	1,613
Thereafter	6,250
Total	$	22,061

Summary of Allowance for Loan Repurchases or Indemnifications

The following table summarizes the activity in the repurchase reserve:

	For the year ended December 31,
	2018			2017			2016
Balance at beginning of period	$	3,386		$	2,659		$	2,156
Provision for loan repurchases or indemnifications	174			810			512
Recoveries on previous losses	3			—			9
Losses on loans repurchased or indemnified	(290		)	(83		)	(18		)
Balance at end of period	$	3,273		$	3,386		$	2,659