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Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Mortgage Servicing Rights, Beginning Balance $ 1,655 $ 1,970
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income (201) (315)
Fair Value, Mortgage Servicing Rights, Ending Balance 1,454 1,655
Fair Value, Mortgage Service Rights, Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Net Derivative Assets and Liabilities, Beginning Balance 1,053 240
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income 5,648 7,850
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale (5,921) (7,037)
Fair Value, Net Derivative Assets and Liabilities, Ending Balance 894 1,053
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held 894 $ 1,053
Variation margin payments for swap liabilities $ 114