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Derivative instruments and hedging activities (Cash flow hedges) (Detail) - Cash flow hedging - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in OCI on derivatives (effective portion) | $ (30) | $ 1,636 | $ 456
Amount of net gain (loss) reclassified from AOCI into income (effective portion) | 41 | 1,458 | (704)
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) | 0 | 0 | 0
Forward contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in OCI on derivatives (effective portion) | $ (30) | $ 1,636 | $ 456
Classification in the statement of operations of the net gain (loss) reclassified from AOCI into income (effective portion and ineffective portion) | Mortgage banking activities | Mortgage banking activities | Mortgage banking activities
Amount of net gain (loss) reclassified from AOCI into income (effective portion) | $ 41 | $ 1,458 | $ (704)
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) | $ 0 | $ 0 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4D Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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- Definition The income statement location of the effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References No definition available. + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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- Definition Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A + Details
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