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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Available-for-sale debt securities [Abstract]
Mortgage-backed securities available for sale	$ 575,999	$ 586,454
Available-for-sale equity securities [Abstract]
Investment securities available for sale	1,351,538	1,106,977
Available-for-sale securities [Abstract]
Amortized cost	1,965,768	1,680,307
Gross unrealized gains	5,015	19,884
Gross unrealized (losses)	(43,246)	(6,760)
Total available for sale securities	1,927,537	1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	1,257,747	518,797
LESS THAN 12 MONTHS, Unrealized (Losses)	(30,682)	(4,512)
OVER 12 MONTHS, Fair Value	290,231	106,140
OVER 12 MONTHS, Unrealized (Losses)	(12,564)	(2,248)
TOTAL, Fair Value	1,547,978	624,937
TOTAL, Unrealized (Losses)	(43,246)	(6,760)
AMORTIZED COST
Due in one year or less	100	0
Due after one year through five years	29,352	36,586
Due after five years through ten years	348,304	347,831
Due after ten years	993,211	705,963
Total	1,370,967	1,090,380
Mortgage-backed securities	593,454	588,918
Common equities and mutual funds	1,347	1,009
Amortized cost	1,965,768	1,680,307
FAIR VALUE
Due in one year or less	100	0
Due after one year through five years	29,688	37,674
Due after five years through ten years	348,680	358,198
Due after ten years	971,174	709,660
Total	1,349,642	1,105,532
Mortgage-backed securities	575,999	586,454
Common equities and mutual funds	1,896	1,445
Total available for sale securities	1,927,537	1,693,431
Small Business Administration Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	51,785	57,046
Gross unrealized gains	27	825
Gross unrealized (losses)	(853)	0
Mortgage-backed securities available for sale	50,959	57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	47,646
LESS THAN 12 MONTHS, Unrealized (Losses)	(853)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	47,646
TOTAL, Unrealized (Losses)	(853)
Obligations of States and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	14,472
Gross unrealized gains	60
Gross unrealized (losses)	(162)
Mortgage-backed securities available for sale	14,370
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	8,443
LESS THAN 12 MONTHS, Unrealized (Losses)	(162)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	8,443
TOTAL, Unrealized (Losses)	(162)
Non-bank Qualified Obligations of States and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	1,105,310	938,883
Gross unrealized gains	2,594	14,983
Gross unrealized (losses)	(24,430)	(3,037)
Mortgage-backed securities available for sale	1,083,474	950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	786,022	280,900
LESS THAN 12 MONTHS, Unrealized (Losses)	(23,032)	(2,887)
OVER 12 MONTHS, Fair Value	25,062	5,853
OVER 12 MONTHS, Unrealized (Losses)	(1,398)	(150)
TOTAL, Fair Value	811,084	286,753
TOTAL, Unrealized (Losses)	(24,430)	(3,037)
Asset-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	199,400	94,451
Gross unrealized gains	1,784	2,381
Gross unrealized (losses)	(345)	0
Mortgage-backed securities available for sale	200,839	96,832
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	107,027
LESS THAN 12 MONTHS, Unrealized (Losses)	(345)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	107,027
TOTAL, Unrealized (Losses)	(345)
Mortgage-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	593,454	588,918
Gross unrealized gains	0	1,259
Gross unrealized (losses)	(17,455)	(3,723)
Mortgage-backed securities available for sale	575,999	586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	306,713	237,897
LESS THAN 12 MONTHS, Unrealized (Losses)	(6,289)	(1,625)
OVER 12 MONTHS, Fair Value	265,169	100,287
OVER 12 MONTHS, Unrealized (Losses)	(11,166)	(2,098)
TOTAL, Fair Value	571,882	338,184
TOTAL, Unrealized (Losses)	(17,455)	(3,723)
Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	1,964,421	1,679,298
Gross unrealized gains	4,465	19,448
Gross unrealized (losses)	(43,245)	(6,760)
Mortgage-backed securities available for sale	1,925,641	1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	1,255,851	518,797
LESS THAN 12 MONTHS, Unrealized (Losses)	(30,681)	(4,512)
OVER 12 MONTHS, Fair Value	290,231	106,140
OVER 12 MONTHS, Unrealized (Losses)	(12,564)	(2,248)
TOTAL, Fair Value	1,546,082	624,937
TOTAL, Unrealized (Losses)	(43,245)	(6,760)
Common Equities and Mutual Funds [Member]
Available-for-sale equity securities [Abstract]
Amortized Cost	1,347	1,009
Gross unrealized gains	550	436
Gross unrealized (losses)	(1)	0
Investment securities available for sale	1,896	$ 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	1,896
LESS THAN 12 MONTHS, Unrealized (Losses)	(1)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	1,896
TOTAL, Unrealized (Losses)	$ (1)

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