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Fair Value Measurements Notional Amount of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Notional Disclosures [Abstract]    
Whole loan contracts and related committed IRLCs $ 5,330 $ 2,182
Uncommitted IRLCs 123,897 50,746
FMBSs related to uncommitted IRLCs 126,000 53,000
Whole loan contracts and related mortgage loans held for sale 8,992 80,956
FMBSs related to mortgage loans held for sale 97,000 91,000
Mortgage loans held for sale covered by FMBSs $ 97,281 $ 90,781