Loans (Summary Of Gross Loans Held For Investment By Year Of Origination And Internally Assigned Credit Grade) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
2020	$ 417,843
2019	211,124
2018	152,826
2017	98,573
2016	68,899
Prior	82,378
Revolving loans at amortized cost	1,291,094
Financing Receivable, before Allowance for Credit Loss, Total	2,322,737	$ 518,300
SBL Non Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	210,731
2019	9,744
2018	13,973
2017	7,802
2016	9,807
Prior	14,602
Financing Receivable, before Allowance for Credit Loss, Total	266,659
SBL Commercial Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	18,877
2019	62,618
2018	44,165
2017	43,370
2016	32,843
Prior	46,325
Financing Receivable, before Allowance for Credit Loss, Total	248,198
SBL Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	1,080
2019	16,907
2018	14,878
2016	711
Financing Receivable, before Allowance for Credit Loss, Total	33,576
Direct Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	168,152
2019	118,167
2018	72,809
2017	40,183
2016	18,317
Prior	4,878
Financing Receivable, before Allowance for Credit Loss, Total	422,506
SBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	1,006,794
Financing Receivable, before Allowance for Credit Loss, Total	1,006,794
IBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	284,300
Financing Receivable, before Allowance for Credit Loss, Total	284,300
Other Specialty Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	2,813
2019	3,688
2018	7,001
2017	7,202
2016	7,221
Prior	13,108
Financing Receivable, before Allowance for Credit Loss, Total	41,033
Advisor Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	15,669
Financing Receivable, before Allowance for Credit Loss, Total	15,669
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	521
2017	16
Prior	3,465
Financing Receivable, before Allowance for Credit Loss, Total	4,002
Non-Rated [Member] | SBL Non Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	205,247
Financing Receivable, before Allowance for Credit Loss, Total	205,247
Non-Rated [Member] | SBL Commercial Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	7,037
2019	8,795
Financing Receivable, before Allowance for Credit Loss, Total	15,832
Non-Rated [Member] | SBL Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	382
Financing Receivable, before Allowance for Credit Loss, Total	382
Non-Rated [Member] | Direct Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	5,235
2019	3,839
2018	2,837
2017	1,421
2016	763
Prior	62
Financing Receivable, before Allowance for Credit Loss, Total	14,157
Non-Rated [Member] | SBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	19,126
Financing Receivable, before Allowance for Credit Loss, Total	19,126
Non-Rated [Member] | IBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	75,814
Financing Receivable, before Allowance for Credit Loss, Total	75,814
Non-Rated [Member] | Other Specialty Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	2,696
Financing Receivable, before Allowance for Credit Loss, Total	2,696
Non-Rated [Member] | Advisor Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	140
Financing Receivable, before Allowance for Credit Loss, Total	140
Non-Rated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	521
2017	16
Prior	1,682
Financing Receivable, before Allowance for Credit Loss, Total	2,219
Pass [Member] | SBL Non Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	5,484
2019	9,701
2018	12,809
2017	7,124
2016	7,887
Prior	11,923
Financing Receivable, before Allowance for Credit Loss, Total	54,928
Pass [Member] | SBL Commercial Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	11,840
2019	53,823
2018	44,165
2017	43,370
2016	32,767
Prior	37,966
Financing Receivable, before Allowance for Credit Loss, Total	223,931
Pass [Member] | SBL Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	698
2019	16,907
2018	14,878
Financing Receivable, before Allowance for Credit Loss, Total	32,483
Pass [Member] | Direct Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	157,214
2019	114,013
2018	69,443
2017	38,538
2016	16,872
Prior	4,755
Financing Receivable, before Allowance for Credit Loss, Total	400,835
Pass [Member] | SBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	987,668
Financing Receivable, before Allowance for Credit Loss, Total	987,668
Pass [Member] | IBLOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving loans at amortized cost	208,486
Financing Receivable, before Allowance for Credit Loss, Total	208,486
Pass [Member] | Other Specialty Lending [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	117
2019	3,688
2018	7,001
2017	7,202
2016	7,221
Prior	13,108
Financing Receivable, before Allowance for Credit Loss, Total	38,337
Pass [Member] | Advisor Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	15,529
Financing Receivable, before Allowance for Credit Loss, Total	15,529
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Prior	1,471
Financing Receivable, before Allowance for Credit Loss, Total	1,471
Special Mention [Member] | SBL Non Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2018	1,164
2017	43
2016	534
Prior	750
Financing Receivable, before Allowance for Credit Loss, Total	2,491
Special Mention [Member] | SBL Commercial Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Prior	261
Financing Receivable, before Allowance for Credit Loss, Total	261
Special Mention [Member] | Direct Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2016	8
Financing Receivable, before Allowance for Credit Loss, Total	8
Substandard [Member] | SBL Non Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
2019	43
2017	635
2016	1,386
Prior	1,929
Financing Receivable, before Allowance for Credit Loss, Total	3,993
Substandard [Member] | SBL Commercial Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
2016	76
Prior	8,098
Financing Receivable, before Allowance for Credit Loss, Total	8,174
Substandard [Member] | SBL Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
2016	711
Financing Receivable, before Allowance for Credit Loss, Total	711
Substandard [Member] | Direct Lease Financing [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	5,703
2019	315
2018	529
2017	224
2016	674
Prior	61
Financing Receivable, before Allowance for Credit Loss, Total	7,506
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Prior	312
Financing Receivable, before Allowance for Credit Loss, Total	$ 312