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Segment reporting - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) segment | Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Other noninterest expense | $ 69,898 | $ 36,710 | $ 150,352 | $ 109,447
Relief of goodwill due to sale of TPO mortgage delivery channel |  |  | 0 | 100
Interest income | 76,504 | 67,639 | 201,350 | 194,363
Mortgage Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other noninterest expense | 330 | 112 | 330 | 1,995
Relief of goodwill due to sale of TPO mortgage delivery channel |  | 100 |  | 100
Interest paid | $ 3,940 | $ 2,875 | $ 9,650 | $ 8,723
Mortgage Segment | Prime Interest Rate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Warehouse line of credit interest rate | 3.25% | 5.00% | 3.25% | 5.00%
Banking Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other noninterest expense | $ 69,568 | $ 36,598 | $ 150,022 | $ 107,452
Interest income | $ 3,940 | $ 2,875 | $ 9,650 | $ 8,723

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- Definition Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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