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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in OCI on derivatives (effective portion) | $ 1,636 | $ 456 | $ (6,594)
Amount of net gain (loss) reclassified from AOCI into income (effective portion) | 1,458 | (704) | (5,559)
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) | $ 1,636 | $ 456 | $ (6,594)
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) | $ 1,458 | $ (704) | $ (5,559)
Amount of net gain (loss) recognized in income on derivatives (ineffective portion) | $ 0 | $ 0 | $ 0

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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