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Fair value measurements - Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | $ 4,802,053 | $ 4,781,751
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 | 1,809 | 11,254
Level 3 | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 4,800,244 | 4,770,497
Fair value measurements on a nonrecurring basis | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 77 | 2,621
Real estate acquired in settlement of loans | 186 |
Fair value measurements on a nonrecurring basis | Level 1 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 0 | 0
Real estate acquired in settlement of loans | 0 |
Fair value measurements on a nonrecurring basis | Level 2 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 0 | 0
Real estate acquired in settlement of loans | 0 |
Fair value measurements on a nonrecurring basis | Level 3 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 77 | $ 2,621
Real estate acquired in settlement of loans | $ 186 |

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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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