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Securities (Tables)
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and fair value of investments classified as available-for-sale
 
 
 
 
 
September 30, 2015
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
11,059

 
$
61

 
$
—

 
$
11,120

Mortgage Backed Securities - Residential
 
188,184

 
6,391

 
(235
)
 
194,340

Mortgage Backed Securities - Commercial
 
10

 
—

 
—

 
10

Collateralized Mortgage Obligations
 
453,593

 
4,019

 
(3,703
)
 
453,909

State and Municipal Obligations
 
204,279

 
7,438

 
(377
)
 
211,340

Collateralized Debt Obligations
 
9,715

 
5,402

 
—

 
15,117

TOTAL
 
$
866,840

 
$
23,311

 
$
(4,315
)
 
$
885,836

 
 
 
 
 
December 31, 2014
(Dollar amounts in thousands)
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
U.S. Government agencies
 
$
1,411

 
$
56

 
$
—

 
$
1,467

Mortgage Backed Securities-residential
 
180,673

 
7,593

 
(330
)
 
187,936

Mortgage Backed Securities-commercial
 
17

 
—

 
—

 
17

Collateralized mortgage obligations
 
489,765

 
2,513

 
(7,623
)
 
484,655

State and municipal
 
198,875

 
9,019

 
(219
)
 
207,675

Collateralized debt obligations
 
10,205

 
5,115

 
(17
)
 
15,303

TOTAL
 
$
880,946

 
$
24,296

 
$
(8,189
)
 
$
897,053
Schedule of contractual maturities of debt securities
Contractual maturities of debt securities at September 30, 2015 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and equity securities are shown separately.
 
 
Available-for-Sale
 
 
Amortized
 
Fair
(Dollar amounts in thousands)
 
Cost
 
Value
Due in one year or less
 
$
3,399

 
$
3,426

Due after one but within five years
 
40,291

 
41,512

Due after five but within ten years
 
88,042

 
91,552

Due after ten years
 
93,321

 
101,087

 
 
225,053

 
237,577

Mortgage-backed securities and collateralized mortgage obligations
 
641,787

 
648,259

TOTAL
 
$
866,840

 
$
885,836
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position
The following tables show the securities’ 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, 2015 and December 31, 2014. 
 
 
September 30, 2015
 
 
Less Than 12 Months
 
More Than 12 Months
 
 
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
Mortgage Backed Securities - Residential
 
$
18,372

 
$
(180
)
 
$
19,957

 
$
(55
)
 
$
38,329

 
$
(235
)
Collateralized mortgage obligations
 
147,188

 
(3,318
)
 
55,710

 
(385
)
 
202,898

 
(3,703
)
State and municipal obligations
 
4,372

 
(101
)
 
23,387

 
(276
)
 
27,759

 
(377
)
Total temporarily impaired securities
 
$
169,932

 
$
(3,599
)
 
$
99,054

 
$
(716
)
 
$
268,986

 
$
(4,315
)
 
 
 
December 31, 2014
 
 
Less Than 12 Months
 
More Than 12 Months
 
 
 
Total
 
 
 
 
Unrealized
 
 
 
Unrealized
 
 
 
Unrealized
(Dollar amounts in thousands)
 
Fair Value
 
Losses
 
Fair Value
 
Losses
 
Fair Value
 
Losses
Mortgage Backed Securities - Residential
 
$
—

 
$
—

 
$
23,849

 
$
(330
)
 
$
23,849

 
$
(330
)
Collateralized mortgage obligations
 
50,832

 
(128
)
 
264,940

 
(7,495
)
 
315,772

 
(7,623
)
State and municipal obligations
 
6,500

 
(35
)
 
10,547

 
(184
)
 
17,047

 
(219
)
Collateralized Debt Obligations
 
—

 
—

 
200

 
(17
)
 
200

 
(17
)
Total temporarily impaired securities
 
$
57,332

 
$
(163
)
 
$
299,536

 
$
(8,026
)
 
$
356,868

 
$
(8,189
)
Rollforward of the credit losses recognized in earnings
The table below presents a rollforward of the credit losses recognized in earnings for the three and nine month periods ended September 30, 2015 and 2014:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollar amounts in thousands)
 
2015
 
2014
 
2015
 
2014
Beginning balance
 
$
13,995

 
$
14,079

 
$
14,050

 
$
14,079

Increases to the amount related to the credit
 
 

 
 

 
 

 
 

Loss for which other-than-temporary was previously recognized
 
—

 
—

 
—

 
—

Reductions for increases in cash flows collected
 
—

 
(29
)
 
(55
)
 
(29
)
Amounts realized for securities sold during the period
 
—

 
—

 
—

 
—

Ending balance
 
$
13,995

 
$
14,050

 
$
13,995

 
$
14,050