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SECURITIES (Tables)
 6 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Securities Available for Sale
The amortized cost, gross unrealized gains and losses and estimated fair values of available for sale and held to maturity securities at March 31, 2017 and September 30, 2016 are presented below.
Available For Sale
 
 
GROSS

 
GROSS

 
 
At March 31, 2017
AMORTIZED
COST

 
UNREALIZED
GAINS

 
UNREALIZED
(LOSSES)

 
FAIR
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Small business administration securities
130,175

 
1,173

 
—

 
131,348

Non-bank qualified obligations of states and political subdivisions
927,959

 
7,914

 
(3,863
)
 
932,010

Asset-backed securities
118,011

 
1,516

 
—

 
119,527

Mortgage-backed securities
651,784

 
—

 
(8,951
)
 
642,833

Total debt securities
1,827,929

 
10,603

 
(12,814
)
 
1,825,718

Common equities and mutual funds
1,127

 
439

 
(11
)
 
1,555

Total available for sale securities
$
1,829,056

 
$
11,042

 
$
(12,825
)
 
$
1,827,273

At September 30, 2016
AMORTIZED
COST

 
GROSS
UNREALIZED
GAINS

 
GROSS
UNREALIZED
(LOSSES)

 
FAIR
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Trust preferred securities
$
14,935

 
$
—

 
$
(1,957
)
 
$
12,978

Small business administration securities
78,431

 
2,288

 
—

 
80,719

Non-bank qualified obligations of states and political subdivisions
668,628

 
30,141

 
(97
)
 
698,672

 Asset-backed securities
117,487

 
73

 
(745
)
 
116,815

Mortgage-backed securities
555,036

 
4,382

 
(478
)
 
558,940

Total debt securities
1,434,517

 
36,884

 
(3,277
)
 
1,468,124

Common equities and mutual funds
755

 
373

 
(3
)
 
1,125

Total available for sale securities
$
1,435,272

 
$
37,257

 
$
(3,280
)
 
$
1,469,249
Securities Held to Maturity


Held to Maturity
 
 
GROSS

 
GROSS

 
 
At March 31, 2017
AMORTIZED
COST

 
UNREALIZED
GAINS

 
UNREALIZED
(LOSSES)

 
FAIR
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
20,177

 
$
71

 
$
(143
)
 
$
20,105

Non-bank qualified obligations of states and political subdivisions
454,129

 
2,397

 
(3,188
)
 
453,338

Mortgage-backed securities
122,497

 
—

 
(1,517
)
 
120,980

Total held to maturity securities
$
596,803

 
$
2,468

 
$
(4,848
)
 
$
594,423


At September 30, 2016
AMORTIZED
COST

 
GROSS
UNREALIZED
GAINS

 
GROSS
UNREALIZED
(LOSSES)

 
FAIR
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
20,626

 
$
355

 
$
(44
)
 
$
20,937

Non-bank qualified obligations of states and political subdivisions
465,469

 
11,744

 
(11
)
 
477,202

Mortgage-backed securities
133,758

 
708

 
(31
)
 
134,435

Total held to maturity securities
$
619,853

 
$
12,807

 
$
(86
)
 
$
632,574
Gross Unrealized Losses and Fair Value of Securities Available for Sale in Continuous Unrealized Loss Position
Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2017 and September 30, 2016, were as follows:

Available For Sale
LESS THAN 12 MONTHS
 
OVER 12 MONTHS
 
TOTAL
At March 31, 2017
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
 
 
 
 
Non-bank qualified obligations of states and political subdivisions
239,208

 
(3,722
)
 
2,594

 
(141
)
 
241,802

 
(3,863
)
Mortgage-backed securities
609,681

 
(8,065
)
 
33,152

 
(886
)
 
642,833

 
(8,951
)
Total debt securities
848,889

 
(11,787
)
 
35,746

 
(1,027
)
 
884,635

 
(12,814
)
Common equities and mutual funds
—

 
—

 
373

 
(11
)
 
373

 
(11
)
Total available for sale securities
$
848,889

 
$
(11,787
)
 
$
36,119

 
$
(1,038
)
 
$
885,008

 
$
(12,825
)

 
LESS THAN 12 MONTHS
 
OVER 12 MONTHS
 
TOTAL
At September 30, 2016
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
 
 
 
 
Trust preferred securities
$
—

 
$
—

 
$
12,978

 
$
(1,957
)
 
$
12,978

 
$
(1,957
)
Non-bank qualified obligations of states and political subdivisions
8,481

 
(58
)
 
2,688

 
(39
)
 
11,169

 
(97
)
Asset-backed securities
89,403

 
(745
)
 
—

 
—

 
89,403

 
(745
)
Mortgage-backed securities
54,065

 
(230
)
 
36,979

 
(248
)
 
91,044

 
(478
)
Total debt securities
151,949

 
(1,033
)
 
52,645

 
(2,244
)
 
204,594

 
(3,277
)
Common equities and mutual funds
—

 
—

 
125

 
(3
)
 
125

 
(3
)
Total available for sale securities
$
151,949

 
$
(1,033
)
 
$
52,770

 
$
(2,247
)
 
$
204,719

 
$
(3,280
)
Gross Unrealized Losses and Fair Value of Securities Held to Maturity in Continuous Unrealized Loss Position
Held To Maturity
LESS THAN 12 MONTHS
 
OVER 12 MONTHS
 
TOTAL
At March 31, 2017
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
12,902

 
$
(123
)
 
$
1,329

 
$
(20
)
 
$
14,231

 
$
(143
)
Non-bank qualified obligations of states and political subdivisions
283,033

 
(3,188
)
 
—

 
—

 
283,033

 
(3,188
)
Mortgage-backed securities
120,980

 
(1,517
)
 
—

 
—

 
120,980

 
(1,517
)
Total held to maturity securities
$
416,915

 
$
(4,828
)
 
$
1,329

 
$
(20
)
 
$
418,244

 
$
(4,848
)
 
LESS THAN 12 MONTHS
 
OVER 12 MONTHS
 
TOTAL
At September 30, 2016
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
Fair Value
 
Unrealized
(Losses)
 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
2,909

 
$
(13
)
 
$
2,256

 
$
(31
)
 
$
5,165

 
$
(44
)
Non-bank qualified obligations of states and political subdivisions
1,294

 
(11
)
 
—

 
—

 
1,294

 
(11
)
Mortgage-backed securities
20,061

 
(31
)
 
—

 
—

 
20,061

 
(31
)
Total held to maturity securities
$
24,264

 
$
(55
)
 
$
2,256

 
$
(31
)
 
$
26,520

 
$
(86
)
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity
The amortized cost and fair value of debt securities by contractual maturity as of the dates set forth below are shown below.  Certain securities have call features which allow the issuer to call the security prior to maturity.  Expected maturities may differ from contractual maturities in mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.  The expected maturities of certain housing related municipal securities, Small Business Administration and asset-backed securities may differ from contractual maturities because the borrowers may have the right to prepay the obligation. However, certain prepayment penalties may apply.

Available For Sale
AMORTIZED
COST

 
FAIR
VALUE

 
At March 31, 2017
(Dollars in Thousands)
 
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
18,662

 
19,134

Due after five years through ten years
444,661

 
450,446

Due after ten years
712,822

 
713,305

 
1,176,145

 
1,182,885

Mortgage-backed securities
651,784

 
642,833

Common equities and mutual funds
1,127

 
1,555

Total available for sale securities
$
1,829,056

 
$
1,827,273

 
AMORTIZED
COST

 
FAIR
VALUE

At September 30, 2016
(Dollars in Thousands)
 
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
17,370

 
17,897

Due after five years through ten years
426,034

 
446,771

Due after ten years
436,077

 
444,516

 
879,481

 
909,184

Mortgage-backed securities
555,036

 
558,940

Common equities and mutual funds
755

 
1,125

Total available for sale securities
$
1,435,272

 
$
1,469,249


Held To Maturity
AMORTIZED
COST

 
FAIR
VALUE

 
At March 31, 2017
(Dollars in Thousands)
 
 
 
 
Due in one year or less
$
341

 
$
340

Due after one year through five years
17,723

 
17,814

Due after five years through ten years
152,790

 
153,428

Due after ten years
303,452

 
301,861

 
474,306

 
473,443

Mortgage-backed securities
122,497

 
120,980

Total held to maturity securities
$
596,803

 
$
594,423


 
AMORTIZED
COST

 
FAIR
VALUE

At September 30, 2016
(Dollars in Thousands)
Due in one year or less
$
472

 
$
471

Due after one year through five years
12,502

 
12,696

Due after five years through ten years
157,944

 
163,806

Due after ten years
315,177

 
321,166

 
486,095

 
498,139

Mortgage-backed securities
133,758

 
134,435

Total held to maturity securities
$
619,853

 
$
632,574