AVAILABLE FOR SALE SECURITIES, Contractual Maturities (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Amortized cost
Within one year	$ 5
After one but within five years	24,179
After five but within ten years	77,073
After ten years	453,035
Total	554,292
Carry value
Within one year	5
After one but within five years	24,456
After five but within ten years	77,361
After ten years	445,620
Total	$ 547,442
Weighted-average yield
Within one year (in hundredths)	0.86%
After one but within five years (in hundredths)	1.59%
After five but within ten years (in hundredths)	1.51%
After ten years (in hundredths)	1.39%
Total (in hundredths)	1.42%
RJ Bank | Agency MBS and CMOs
Amortized cost
Within one year	$ 5
After one but within five years	24,179
After five but within ten years	77,073
After ten years	251,532
Total	352,789
Carry value
Within one year	5
After one but within five years	24,456
After five but within ten years	77,361
After ten years	252,608
Total	$ 354,430
Weighted-average yield
Within one year (in hundredths)	0.86%
After one but within five years (in hundredths)	1.59%
After five but within ten years (in hundredths)	1.51%
After ten years (in hundredths)	1.43%
Total (in hundredths)	1.46%
RJ Bank | Non-agency CMOs:
Amortized cost
Within one year	$ 0
After one but within five years	0
After five but within ten years	0
After ten years	68,135
Total	68,135
Carry value
Within one year	0
After one but within five years	0
After five but within ten years	0
After ten years	63,694
Total	$ 63,694
Weighted-average yield
Within one year (in hundredths)	0.00%
After one but within five years (in hundredths)	0.00%
After five but within ten years (in hundredths)	0.00%
After ten years (in hundredths)	2.52%
Total (in hundredths)	2.52%
RJ Bank | Other securities
Amortized cost
Within one year	$ 0
After one but within five years	0
After five but within ten years	0
After ten years	1,575
Total	1,575
Carry value
Within one year	0
After one but within five years	0
After five but within ten years	0
After ten years	1,297
Total	$ 1,297
Weighted-average yield
Within one year (in hundredths)	0.00%
After one but within five years (in hundredths)	0.00%
After five but within ten years (in hundredths)	0.00%
After ten years (in hundredths)	0.00%
Total (in hundredths)	0.00%
RJ Bank | Sub-total agency MBS & CMOs, non-agency CMOs, and other securities
Amortized cost
Within one year	$ 5
After one but within five years	24,179
After five but within ten years	77,073
After ten years	321,242
Total	422,499
Carry value
Within one year	5
After one but within five years	24,456
After five but within ten years	77,361
After ten years	317,599
Total	$ 419,421
Weighted-average yield
Within one year (in hundredths)	0.86%
After one but within five years (in hundredths)	1.59%
After five but within ten years (in hundredths)	1.51%
After ten years (in hundredths)	1.65%
Total (in hundredths)	1.62%
Non-broker-dealer subsidiaries | ARS municipal obligations
Amortized cost
Within one year	$ 0
After one but within five years	0
After five but within ten years	0
After ten years	27,491
Total	27,491
Carry value
Within one year	0
After one but within five years	0
After five but within ten years	0
After ten years	25,422
Total	$ 25,422
Weighted-average yield
Within one year (in hundredths)	0.00%
After one but within five years (in hundredths)	0.00%
After five but within ten years (in hundredths)	0.00%
After ten years (in hundredths)	0.55%
Total (in hundredths)	0.55%
Non-broker-dealer subsidiaries | ARS - preferred securities
Amortized cost
Within one year	$ 0
After one but within five years	0
After five but within ten years	0
After ten years	104,302
Total	104,302
Carry value
Within one year	0
After one but within five years	0
After five but within ten years	0
After ten years	102,599
Total	$ 102,599
Weighted-average yield
Within one year (in hundredths)	0.00%
After one but within five years (in hundredths)	0.00%
After five but within ten years (in hundredths)	0.00%
After ten years (in hundredths)	0.80%
Total (in hundredths)	0.80%
Non-broker-dealer subsidiaries | Auction rate securities
Amortized cost
Within one year	$ 0
After one but within five years	0
After five but within ten years	0
After ten years	131,793
Total	131,793
Carry value
Within one year	0
After one but within five years	0
After five but within ten years	0
After ten years	128,021
Total	$ 128,021
Weighted-average yield
Within one year (in hundredths)	0.00%
After one but within five years (in hundredths)	0.00%
After five but within ten years (in hundredths)	0.00%
After ten years (in hundredths)	0.75%
Total (in hundredths)	0.75%