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Fair value measurements Fair Value Measurements on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	$ 4,749,525	$ 4,578,822
Level 3 | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	4,744,886	4,570,109
Fair value measurements on a nonrecurring basis | Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Loans	178	2,445
Real estate acquired in settlement of loans	1,030	288
Mortgage servicing rights		1,240
Fair value measurements on a nonrecurring basis | Level 3
Fair value measurements on a recurring and nonrecurring basis
Loans	178	2,445
Real estate acquired in settlement of loans	$ 1,030	288
Mortgage servicing rights		$ 1,240

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Real Estate Acquired Through Foreclosure, Fair Value Disclosure

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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

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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