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Fair Value of Assets and Liabilities (FV on recurring basis-Level 3 rollforward) (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Mortgage Servicing Rights Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, Mortgage Servicing Rights, Beginning Balance $ 1,454 $ 1,655
Fair Value, Mortgage Servicing Rights, Realized and Unrealized Net Gains (Losses) Included in Net Income (50) (69)
Fair Value, Mortgage Servicing Rights, Ending Balance 1,404 1,586
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 894 1,053
Fair Value, Net Derivative Assets and Liabilities, Realized and Unrealized Net Gains (Losses) Included in Net Income 537 1,267
Fair Value, Net Derivative Assets and Liabilities, Transfers to Loans Held for Sale (382) (1,072)
Variation margin payments for swap liabilities (502)  
Fair Value, Net Derivative Assets and Liabilities, Ending Balance 547 1,248
Fair Value, Net Derivative Assets and Liabilities,Total Unrealized Net Gains (Losses) Included in Net Income Related to Assets Still Held $ 547 $ 1,248