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SECURITIES (Tables)
 12 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Securities Available for Sale
Securities available for sale at September 30, 2017 and 2016 were as follows:
 
Available For Sale
 
 
GROSS

 
GROSS

 
 
 
AMORTIZED

 
UNREALIZED

 
UNREALIZED

 
FAIR

At September 30, 2017
COST

 
GAINS

 
(LOSSES)

 
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Small business administration securities
57,046

 
825

 
—

 
57,871

Non-bank qualified obligations of states and political subdivisions
938,883

 
14,983

 
(3,037
)
 
950,829

Asset-backed securities
94,451

 
2,381

 
—

 
96,832

Mortgage-backed securities
588,918

 
1,259

 
(3,723
)
 
586,454

Total debt securities
1,679,298

 
19,448

 
(6,760
)
 
1,691,986

Common equities and mutual funds
1,009

 
436

 
—

 
1,445

Total available for sale securities
$
1,680,307

 
$
19,884

 
$
(6,760
)
 
$
1,693,431


 
AMORTIZED

 
GROSS
UNREALIZED

 
GROSS
UNREALIZED

 
FAIR

At September 30, 2016
COST

 
GAINS

 
(LOSSES)

 
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Trust preferred and corporate 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
Securities held to maturity at September 30, 2017 and 2016 were as follows:
 
Held to Maturity
 
 
GROSS

 
GROSS

 
 
 
AMORTIZED

 
UNREALIZED

 
UNREALIZED

 
FAIR

At September 30, 2017
COST

 
GAINS

 
(LOSSES)

 
VALUE

 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
19,247

 
$
157

 
$
(36
)
 
$
19,368

Non-bank qualified obligations of states and political subdivisions
430,593

 
4,744

 
(2,976
)
 
432,361

Mortgage-backed securities
113,689

 
—

 
(1,233
)
 
112,456

Total held to maturity securities
$
563,529

 
$
4,901

 
$
(4,245
)
 
$
564,185


 
AMORTIZED

 
GROSS
UNREALIZED

 
GROSS
UNREALIZED

 
FAIR

At September 30, 2016
COST

 
GAINS

 
(LOSSES)

 
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
Trust Preferred Securities Included in Available-for-sale Securities
Included in securities available for sale are trust preferred securities as follows:
 
At September 30, 2016
 
 
 
 
 
 
 
 
     
Issuer(1)
Amortized Cost
 
Fair Value
 
Unrealized
Gain (Loss)
 
S&P
Credit Rating
 
Moody's
Credit Rating
 
 (Dollars in Thousands)
Key Corp. Capital I
$
4,987

 
$
4,189

 
$
(798
)
 
BB+
 
Baa2
Huntington Capital Trust II SE
4,981

 
4,077

 
(904
)
 
BB
 
Baa2
PNC Capital Trust
4,968

 
4,712

 
(256
)
 
BBB-
 
Baa1
Total
$
14,936

 
$
12,978

 
$
(1,958
)
 
 
 
  

(1) Trust preferred securities are single-issuance.  There are no known deferrals, defaults or excess subordination.
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 continuous unrealized loss position at September 30, 2017, and 2016, were as follows:
 
Available For Sale
LESS THAN 12 MONTHS
 
OVER 12 MONTHS
 
TOTAL
At September 30, 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
280,900

 
(2,887
)
 
5,853

 
(150
)
 
286,753

 
(3,037
)
Mortgage-backed securities
237,897

 
(1,625
)
 
100,287

 
(2,098
)
 
338,184

 
(3,723
)
Total debt securities
518,797

 
(4,512
)
 
106,140

 
(2,248
)
 
624,937

 
(6,760
)
Total available for sale securities
$
518,797

 
$
(4,512
)
 
$
106,140

 
$
(2,248
)
 
$
624,937

 
$
(6,760
)

 
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 and corporate 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 September 30, 2017
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
Fair
Value
 
Unrealized
(Losses)
 
(Dollars in Thousands)
Debt securities
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
1,364

 
$
(6
)
 
$
4,089

 
$
(30
)
 
$
5,453

 
$
(36
)
Non-bank qualified obligations of states and political subdivisions
202,018

 
(2,783
)
 
6,206

 
(193
)
 
208,224

 
(2,976
)
Mortgage-backed securities
112,456

 
(1,233
)
 
—

 
—

 
112,456

 
(1,233
)
Total held to maturity securities
$
315,838

 
$
(4,022
)
 
$
10,295

 
$
(223
)
 
$
326,133

 
$
(4,245
)

 
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 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 Small Business Administration 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 September 30, 2017
(Dollars in Thousands)
 
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
36,586

 
37,674

Due after five years through ten years
347,831

 
358,198

Due after ten years
705,963

 
709,660

 
1,090,380

 
1,105,532

Mortgage-backed securities
588,918

 
586,454

Common equities and mutual funds
1,009

 
1,445

Total available for sale securities
$
1,680,307

 
$
1,693,431

 
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 September 30, 2017
(Dollars in Thousands)
 
 
 
 
Due in one year or less
$
1,483

 
$
1,480

Due after one year through five years
17,926

 
18,160

Due after five years through ten years
144,996

 
147,832

Due after ten years
285,435

 
284,257

 
449,840

 
451,729

Mortgage-backed securities
113,689

 
112,456

Total held to maturity securities
$
563,529

 
$
564,185


 
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
Summary of Activities Related to Sale of Securities Available for Sale
Activities related to the sale of securities are summarized below.
 
 
2017
 
2016
 
2015
September 30,
(Dollars in Thousands)
Available For Sale
 
 
 
 
 
   Proceeds from sales
$
457,306

 
$
285,508

 
$
566,371

   Gross gains on sales
4,091

 
1,459

 
2,753

   Gross losses on sales
4,628

 
1,785

 
4,387

 Net (loss) on available for sale securities
(537
)
 
(326
)
 
(1,634
)
 
 
 
 
 
 
Held To Maturity
 
 
 
 
 
   Net carrying amount of securities sold
$
5,826

 
$
—

 
$
—

   Gross realized gain on sales
92

 
—

 
—

   Gross realized losses on sales
48

 
—

 
—

Net gain on held to maturity securities
44

 
—

 
—