FAIR VALUE, Level 3 Financial Assets and Liabilities, Roll Forward (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Percentage of instruments measured at fair value on a recurring basis
Instruments measured at fair value, percentage of assets (in hundredths)	8.90%	8.70%	8.90%	8.70%
Instruments measured at fair value, percentage of liabilities (in hundredths)	3.90%	3.00%	3.90%	3.00%
Instruments measured at fair value, level 3, percentage of assets (in hundredths)	19.00%	21.00%	19.00%	21.00%
Percentage change of level 3 financial instruments from prior year period	(2.00%)		(2.00%)
Payables-trade and other | Other liabilities
Changes in Level 3 recurring fair value measurements, liabilities [Roll Forward]
Fair value at beginning of period	$ (58,000)	$ (1,417,000)	$ (58,000)	$ (60,000)
Total gains (losses) for the period:
Included in earnings	0	1,335,000	0	(22,000)
Included in other comprehensive income	0	0	0	0
Purchases and contributions	0	0	0	0
Sales	0	0	0	0
Redemptions by issuer	0	0	0	0
Distributions	0	0	0	0
Transfers:
Into level 3	0	0	0	0
Out of level 3	0	0	0	0
Fair value at end of period	(58,000)	(82,000)	(58,000)	(82,000)
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net liabilities) for liabilities held at the end of the reporting period	0	0	0	(22,000)
Trading instruments | Non-agency CMOs and ABS
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	11,000	13,000	11,000	14,000
Total gains (losses) for the period:
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Purchases and contributions	0	0	0	0
Sales	0	0	0	0
Redemptions by issuer	0	0	0	0
Distributions	(1,000)	0	(1,000)	(1,000)
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	10,000	13,000	10,000	13,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	0	0	0	20,000
Trading instruments | Equity securities
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	14,000	35,000	44,000	35,000
Total gains (losses) for the period:
Included in earnings	0	5,000	5,000	4,000
Included in other comprehensive income	0	0	0	0
Purchases and contributions	0	23,000	20,000	24,000
Sales	0	(26,000)	0	(26,000)
Redemptions by issuer	0	0	0	0
Distributions	0	0	0	0
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	(55,000)	0
Fair value at end of period	14,000	37,000	14,000	37,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	0	5,000	5,000	4,000
Trading instruments | Other
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	5,264,000	4,199,000	2,309,000	3,956,000
Total gains (losses) for the period:
Included in earnings	(20,000)	(32,000)	(40,000)	(201,000)
Included in other comprehensive income	0	0	0	0
Purchases and contributions	11,358,000	3,185,000	23,333,000	10,448,000
Sales	(15,822,000)	(4,649,000)	(24,822,000)	(11,500,000)
Redemptions by issuer	0	0	0	0
Distributions	0	0	0	0
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	780,000	2,703,000	780,000	2,703,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	0	(32,000)	0	(201,000)
Available for sale securities | Non-agency CMOs
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period		46,000		78,000
Total gains (losses) for the period:
Included in earnings		0		(27,000)
Included in other comprehensive income		6,000		21,000
Purchases and contributions		0		0
Sales		0		0
Redemptions by issuer		0		0
Distributions		(14,000)		(34,000)
Transfers:
Into Level 3		0		0
Out of Level 3		0		0
Fair value at end of period		38,000		38,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period		0		(27,000)
Available for sale securities | ARS - municipals
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	85,814,000	108,458,000	86,696,000	130,934,000
Total gains (losses) for the period:
Included in earnings	2,000	63,000	2,000	5,584,000
Included in other comprehensive income	3,843,000	1,849,000	2,961,000	938,000
Purchases and contributions	0	0	0	0
Sales	(45,000)	0	(45,000)	(370,000)
Redemptions by issuer	0	(410,000)	0	(27,126,000)
Distributions	0	0	0	0
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	89,614,000	109,960,000	89,614,000	109,960,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	3,843,000	63,000	2,961,000	938,000
Available for sale securities | ARS - preferred securities
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	112,955,000	112,122,000	114,039,000	110,784,000
Total gains (losses) for the period:
Included in earnings	25,000	44,000	25,000	44,000
Included in other comprehensive income	(282,000)	374,000	(1,366,000)	1,712,000
Purchases and contributions	0	0	0	0
Sales	0	0	0	0
Redemptions by issuer	(250,000)	(325,000)	(250,000)	(325,000)
Distributions	0	0	0	0
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	112,448,000	112,215,000	112,448,000	112,215,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	(282,000)	44,000	(1,366,000)	1,712,000
Private equity, other investments and other assets | Private equity investments
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	208,674,000	209,977,000	211,666,000	216,391,000
Total gains (losses) for the period:
Included in earnings	14,414,000	13,000	17,060,000	4,781,000
Included in other comprehensive income	0	0	0	0
Purchases and contributions	2,241,000	5,317,000	6,343,000	9,332,000
Sales	0	0	0	(7,076,000)
Redemptions by issuer	0	0	0	0
Distributions	(4,385,000)	(5,329,000)	(14,125,000)	(13,450,000)
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	(18,577,000)	0	(18,577,000)
Fair value at end of period	220,944,000	191,401,000	220,944,000	191,401,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	14,414,000	13,000	17,060,000	4,781,000
Valuation adjustments of certain private equity investments
Share of the net valuation adjustments gain	9,800,000		12,200,000	4,400,000
Noncontrolling interests' share of the net valuation adjustments gain	4,600,000		4,900,000	400,000
Private equity, other investments and other assets | Other investments
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	1,564,000	1,949,000	1,731,000	4,607,000
Total gains (losses) for the period:
Included in earnings	41,000	48,000	81,000	73,000
Included in other comprehensive income	0	0	0	0
Purchases and contributions	0	0	0	63,000
Sales	0	0	0	(2,698,000)
Redemptions by issuer	(663,000)	(28,000)	(673,000)	(28,000)
Distributions	(26,000)	(181,000)	(223,000)	(229,000)
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	916,000	1,788,000	916,000	1,788,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	41,000	60,000	81,000	166,000
Private equity, other investments and other assets | Other receivables
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period				2,778,000
Total gains (losses) for the period:
Included in earnings				(2,778,000)
Included in other comprehensive income				0
Purchases and contributions				0
Sales				0
Redemptions by issuer				0
Distributions				0
Transfers:
Into Level 3				0
Out of Level 3				0
Fair value at end of period		0		0
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period				0
Private equity, other investments and other assets | Other assets
Changes in Level 3 recurring fair value measurements, assets [Roll Forward]
Fair value at beginning of period	2,407,000	15,000	787,000	15,000
Total gains (losses) for the period:
Included in earnings	(211,000)	0	1,409,000	0
Included in other comprehensive income	0	0	0	0
Purchases and contributions	0	0	0	0
Sales	0	0	0	0
Redemptions by issuer	0	0	0	0
Distributions	0	0	0	0
Transfers:
Into Level 3	0	0	0	0
Out of Level 3	0	0	0	0
Fair value at end of period	2,196,000	15,000	2,196,000	15,000
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets/liabilities) for assets/liabilities held at the end of the reporting period
Change in unrealized gains (losses) for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period	$ (211,000)	$ 0	$ 1,409,000	$ 0