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Fair value measurements - Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | $ 5,228,524 | $ 5,439,330
Level 1 | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 0 | 0
Level 2 | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 10,403 | 28,354
Level 3 | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | $ 5,218,121 | 5,410,976
Fair value measurements on a nonrecurring basis | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans |  | 387
Mortgage servicing rights |  | 3,001
Fair value measurements on a nonrecurring basis | Level 1 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans |  | 0
Mortgage servicing rights |  | 0
Fair value measurements on a nonrecurring basis | Level 2 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans |  | 0
Mortgage servicing rights |  | 0
Fair value measurements on a nonrecurring basis | Level 3 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans |  | 387
Mortgage servicing rights |  | $ 3,001

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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