Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Financial Instruments with Off-Balance Sheet Credit Risk

	June 30,		December 31,
	2021		2020
Commitments to extend credit, excluding interest rate lock commitments	$	2,529,697	$	2,719,996
Letters of credit	68,792		67,598
Balance at end of period	$	2,598,489	$	2,787,594

Schedule 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 and six months ended June 30, 2021 and 2020:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Balance at beginning of period	$	14,156	$	4,618	$	16,378	$	—
Impact of CECL adoption on provision for credit losses     on unfunded commitments	—		—		—		2,947
Increase in provision for credit losses from unfunded commitments acquired in business combination	—		—		—		70
Provision for credit losses on unfunded commitments	(954)		1,882		(3,176)		3,483
Balance at end of period	$	13,202	$	6,500	$	13,202	$	6,500

Schedule of Activity in the Repurchase Reserve

The following table summarizes the activity in the repurchase reserve:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Balance at beginning of period	$	6,284	$	3,829	$	5,928	$	3,529
Provision for loan repurchases or indemnifications	(706)		855		(266)		1,227
Losses on loans repurchased or indemnified	(89)		(83)		(173)		(155)
Balance at end of period	$	5,489	$	4,601	$	5,489	$	4,601