Annual report pursuant to Section 13 and 15(d)

21. Net Gain on Trading Securities (Details)

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21. Net Gain on Trading Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net gain recognized during the period on trading securities sold during the period $ 17,314  
Net unrealized gain recognized during the reporting period on trading securities still held at the reporting date 16,432  
Net gain recognized during the period on trading securities $ 33,746  
(Recast)    
Net gain recognized during the period on trading securities sold during the period   $ 5,322
Net unrealized gain recognized during the reporting period on trading securities still held at the reporting date   5,484
Net gain recognized during the period on trading securities [1]   $ 10,806
[1] See Notes 1 and 3 for information regarding recast amounts and basis of financial statement presentation.