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Allowance for Credit Losses Individually Evaluated Impaired Loans (Details) - Conventional Loan [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 9,648   $ 9,648   $ 9,889
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 9,455   9,455   9,708
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   0
Impaired Financing Receivable, Related Allowance 0   0   0
Impaired Financing Receivable, Recorded Investment 9,648   9,648   9,889
Impaired Financing Receivable, Unpaid Principal Balance 9,455   9,455   $ 9,708
Impaired Financing Receivable, Average Recorded Investment 9,529 $ 9,455 9,284 $ 9,306  
Impaired Financing Receivable, Interest Income, Accrual Method $ 113 $ 117 $ 221 $ 234