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Fair Value Measurements Notional Amount of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Notional Disclosures [Abstract]    
Best efforts contracts and related committed IRLCs $ 9,555 $ 6,607
Uncommitted IRLCs 109,140 66,875
FMBSs related to uncommitted IRLCs 109,000 66,000
Best efforts contracts and related mortgage loans held for sale 8,324 125,348
FMBSs related to mortgage loans held for sale 82,284 33,000
Mortgage loans held for sale covered by FMBSs $ 82,330 $ 32,870