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SECURITIES - Available for Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Available-for-sale debt securities [Abstract]    
Fair value $ 666,424 $ 558,940
Available-for-sale equity securities [Abstract]    
Fair value 1,141,684 910,309
Available-for-sale securities [Abstract]    
Amortized cost 1,797,966 1,435,272
Gross unrealized gains 19,811 37,257
Gross unrealized (losses) (9,669) (3,280)
Total available for sale securities 1,808,108 1,469,249
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 846,172 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) (8,936) (1,033)
OVER 12 MONTHS, Fair Value 32,236 52,770
OVER 12 MONTHS, Unrealized (Losses) (733) (2,247)
TOTAL, Fair Value 878,408 204,719
TOTAL, Unrealized (Losses) (9,669) (3,280)
AMORTIZED COST    
Due in one year or less 0 0
Due after one year through five years 27,310 17,370
Due after five years through ten years 393,509 426,034
Due after ten years 703,553 436,077
Total 1,124,372 879,481
Mortgage-backed securities 672,554 555,036
Common equities and mutual funds 1,040 755
Amortized cost 1,797,966 1,435,272
FAIR VALUE    
Due in one year or less 0 0
Due after one year through five years 28,136 17,897
Due after five years through ten years 404,534 446,771
Due after ten years 707,569 444,516
Total 1,140,239 909,184
Mortgage-backed securities 666,424 558,940
Common equities and mutual funds 1,445 1,125
Total available for sale securities 1,808,108 1,469,249
Trust Preferred Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost   14,935
Gross unrealized gains   0
Gross unrealized (losses)   (1,957)
Fair value   12,978
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value   0
LESS THAN 12 MONTHS, Unrealized (Losses)   0
OVER 12 MONTHS, Fair Value   12,978
OVER 12 MONTHS, Unrealized (Losses)   (1,957)
TOTAL, Fair Value   12,978
TOTAL, Unrealized (Losses)   (1,957)
Small Business Administration Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 100,968 78,431
Gross unrealized gains 1,093 2,288
Gross unrealized (losses) (1) 0
Fair value 102,060 80,719
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 3,955  
LESS THAN 12 MONTHS, Unrealized (Losses) (1)  
OVER 12 MONTHS, Fair Value 0  
OVER 12 MONTHS, Unrealized (Losses) 0  
TOTAL, Fair Value 3,955  
TOTAL, Unrealized (Losses) (1)  
Non-bank Qualified Obligations of States and Political Subdivisions [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 905,504 668,628
Gross unrealized gains 15,546 30,141
Gross unrealized (losses) (3,175) (97)
Fair value 917,875 698,672
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 335,226 8,481
LESS THAN 12 MONTHS, Unrealized (Losses) (3,175) (58)
OVER 12 MONTHS, Fair Value 0 2,688
OVER 12 MONTHS, Unrealized (Losses) 0 (39)
TOTAL, Fair Value 335,226 11,169
TOTAL, Unrealized (Losses) (3,175) (97)
Asset-backed Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 117,900 117,487
Gross unrealized gains 2,404 73
Gross unrealized (losses) 0 (745)
Fair value 120,304 116,815
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value   89,403
LESS THAN 12 MONTHS, Unrealized (Losses)   (745)
OVER 12 MONTHS, Fair Value   0
OVER 12 MONTHS, Unrealized (Losses)   0
TOTAL, Fair Value   89,403
TOTAL, Unrealized (Losses)   (745)
Mortgage-backed Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 672,554 555,036
Gross unrealized gains 359 4,382
Gross unrealized (losses) (6,489) (478)
Fair value 666,424 558,940
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 506,991 54,065
LESS THAN 12 MONTHS, Unrealized (Losses) (5,760) (230)
OVER 12 MONTHS, Fair Value 31,857 36,979
OVER 12 MONTHS, Unrealized (Losses) (729) (248)
TOTAL, Fair Value 538,848 91,044
TOTAL, Unrealized (Losses) (6,489) (478)
Debt Securities [Member]    
Available-for-sale debt securities [Abstract]    
Amortized cost 1,796,926 1,434,517
Gross unrealized gains 19,402 36,884
Gross unrealized (losses) (9,665) (3,277)
Fair value 1,806,663 1,468,124
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 846,172 151,949
LESS THAN 12 MONTHS, Unrealized (Losses) (8,936) (1,033)
OVER 12 MONTHS, Fair Value 31,857 52,645
OVER 12 MONTHS, Unrealized (Losses) (729) (2,244)
TOTAL, Fair Value 878,029 204,594
TOTAL, Unrealized (Losses) (9,665) (3,277)
Common Equities and Mutual Funds [Member]    
Available-for-sale equity securities [Abstract]    
Amortized cost 1,040 755
Gross unrealized gains 409 373
Gross unrealized (losses) (4) (3)
Fair value 1,445 1,125
Available-for-sale securities in a continuous unrealized loss position [Abstract]    
LESS THAN 12 MONTHS, Fair Value 0 0
LESS THAN 12 MONTHS, Unrealized (Losses) 0 0
OVER 12 MONTHS, Fair Value 379 125
OVER 12 MONTHS, Unrealized (Losses) (4) (3)
TOTAL, Fair Value 379 125
TOTAL, Unrealized (Losses) $ (4) $ (3)