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Loans - Investment Loans Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Impaired loans          
Total Carrying value of Impaired Loans $ 55,823   $ 55,823   $ 76,543
Unpaid Principal Balance of Impaired Loans 94,690   94,690   105,029
Carrying Value for Which There Is A Related Allowance for Loan Losses 41,693   41,693   58,890
Carrying Value for Which There Is No Related Allowance for Loan Losses 14,130   14,130   17,653
Interest income recognized on impaired loans 800 $ 1,500 1,900 $ 2,800  
Average carrying amount of impaired loans     67,700   77,000
Non-credit impaired loans          
Impaired loans          
Total Carrying value of Impaired Loans 30,386   30,386   32,425
Unpaid Principal Balance of Impaired Loans 47,032   47,032   33,185
Carrying Value for Which There Is A Related Allowance for Loan Losses 16,256   16,256   14,772
Carrying Value for Which There Is No Related Allowance for Loan Losses 14,130   14,130   17,653
Credit impaired loans          
Impaired loans          
Total Carrying value of Impaired Loans 25,437   25,437   44,118
Unpaid Principal Balance of Impaired Loans 47,658   47,658   71,844
Carrying Value for Which There Is A Related Allowance for Loan Losses $ 25,437   $ 25,437   $ 44,118