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Fair value measurements Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | $ 4,578,822 | $ 4,211,290
Level 3 | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 4,578,822 | 4,211,290
Fair value measurements on a nonrecurring basis | Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 2,000 | 4,000
Tax credit investments | 9,000 |
Real estate acquired in settlement of loans | 0 | 0
Fair value measurements on a nonrecurring basis | Level 3 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Loans | 2,000 | 4,000
Tax credit investments | 9,000 |
Real estate acquired in settlement of loans | $ 0 | $ 0

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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