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SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Available-for-sale debt securities [Abstract]
Mortgage-backed securities available for sale	$ 600,112	$ 586,454
Available-for-sale equity securities [Abstract]
Investment securities available for sale	1,392,240	1,106,977
Available-for-sale securities [Abstract]
Amortized cost	1,984,898	1,680,307
Gross unrealized gains	19,618	19,884
Gross unrealized (losses)	(12,164)	(6,760)
Total available for sale securities	1,992,352	1,693,431
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	807,502	518,797
LESS THAN 12 MONTHS, Unrealized (Losses)	(6,250)	(4,512)
OVER 12 MONTHS, Fair Value	312,297	106,140
OVER 12 MONTHS, Unrealized (Losses)	(5,914)	(2,248)
TOTAL, Fair Value	1,119,799	624,937
TOTAL, Unrealized (Losses)	(12,164)	(6,760)
AMORTIZED COST
Due in one year or less	100	0
Due after one year through five years	55,485	36,586
Due after five years through ten years	452,422	347,831
Due after ten years	869,255	705,963
Total	1,377,262	1,090,380
Mortgage-backed securities	606,338	588,918
Common equities and mutual funds	1,298	1,009
Amortized cost	1,984,898	1,680,307
FAIR VALUE
Due in one year or less	100	0
Due after one year through five years	56,375	37,674
Due after five years through ten years	462,903	358,198
Due after ten years	871,033	709,660
Total	1,390,411	1,105,532
Mortgage-backed securities	600,112	586,454
Common equities and mutual funds	1,829	1,445
Total available for sale securities	1,992,352	1,693,431
Small Business Administration Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	56,602	57,046
Gross unrealized gains	349	825
Gross unrealized (losses)	(3)	0
Mortgage-backed securities available for sale	56,948	57,871
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	14,236
LESS THAN 12 MONTHS, Unrealized (Losses)	(3)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	14,236
TOTAL, Unrealized (Losses)	(3)
Obligations of States and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	14,513
Gross unrealized gains	123
Gross unrealized (losses)	(26)
Mortgage-backed securities available for sale	14,610
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	3,139
LESS THAN 12 MONTHS, Unrealized (Losses)	(26)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	3,139
TOTAL, Unrealized (Losses)	(26)
Non-bank Qualified Obligations of States and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	1,212,661	938,883
Gross unrealized gains	16,079	14,983
Gross unrealized (losses)	(5,710)	(3,037)
Mortgage-backed securities available for sale	1,223,030	950,829
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	553,626	280,900
LESS THAN 12 MONTHS, Unrealized (Losses)	(4,945)	(2,887)
OVER 12 MONTHS, Fair Value	16,045	5,853
OVER 12 MONTHS, Unrealized (Losses)	(765)	(150)
TOTAL, Fair Value	569,671	286,753
TOTAL, Unrealized (Losses)	(5,710)	(3,037)
Asset-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	93,486	94,451
Gross unrealized gains	2,337	2,381
Gross unrealized (losses)	0	0
Mortgage-backed securities available for sale	95,823	96,832
Mortgage-backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	606,338	588,918
Gross unrealized gains	198	1,259
Gross unrealized (losses)	(6,424)	(3,723)
Mortgage-backed securities available for sale	600,112	586,454
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	234,672	237,897
LESS THAN 12 MONTHS, Unrealized (Losses)	(1,275)	(1,625)
OVER 12 MONTHS, Fair Value	296,252	100,287
OVER 12 MONTHS, Unrealized (Losses)	(5,149)	(2,098)
TOTAL, Fair Value	530,924	338,184
TOTAL, Unrealized (Losses)	(6,424)	(3,723)
Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	1,983,600	1,679,298
Gross unrealized gains	19,086	19,448
Gross unrealized (losses)	(12,163)	(6,760)
Mortgage-backed securities available for sale	1,990,523	1,691,986
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	805,673	518,797
LESS THAN 12 MONTHS, Unrealized (Losses)	(6,249)	(4,512)
OVER 12 MONTHS, Fair Value	312,297	106,140
OVER 12 MONTHS, Unrealized (Losses)	(5,914)	(2,248)
TOTAL, Fair Value	1,117,970	624,937
TOTAL, Unrealized (Losses)	(12,163)	(6,760)
Common Equities and Mutual Funds [Member]
Available-for-sale equity securities [Abstract]
Amortized cost	1,298	1,009
Gross unrealized gains	532	436
Gross unrealized (losses)	(1)	0
Investment securities available for sale	1,829	$ 1,445
Available-for-sale securities in a continuous unrealized loss position [Abstract]
LESS THAN 12 MONTHS, Fair Value	1,829
LESS THAN 12 MONTHS, Unrealized (Losses)	(1)
OVER 12 MONTHS, Fair Value	0
OVER 12 MONTHS, Unrealized (Losses)	0
TOTAL, Fair Value	1,829
TOTAL, Unrealized (Losses)	$ (1)

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