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Securities (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of fair value of securities
The following table presents a summary of the amortized cost, gross unrealized holding gains and losses, other-than-temporary impairment recorded in other comprehensive income and fair value of securities available for sale and securities held to maturity for the periods below:
 
June 30, 2015
 
December 31, 2014
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
(Dollars in thousands)
Available for sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
39,375

 
$
351

 
$
—

 
$
39,726

 
$
41,369

 
$
139

 
$
(22
)
 
$
41,486

Agency mortgage-backed securities
226,438

 
5,436

 
(877
)
 
230,997

 
211,168

 
7,203

 
(693
)
 
217,678

Agency collateralized mortgage obligations
55,241

 
477

 
(516
)
 
55,202

 
63,059

 
599

 
(623
)
 
63,035

State, county, and municipal securities
4,571

 
97

 
—

 
4,668

 
5,106

 
117

 
—

 
5,223

Single issuer trust preferred securities issued by banks
2,889

 
11

 
(28
)
 
2,872

 
2,913

 
12

 
(16
)
 
2,909

Pooled trust preferred securities issued by banks and insurers (1)
2,246

 
—

 
(651
)
 
1,595

 
7,906

 
195

 
(1,780
)
 
6,321

Small business administration pooled securities

26,632

 
—

 
(135
)
 
26,497

 
—

 
—

 
—

 
—

Equity securities
13,201

 
579

 
(336
)
 
13,444

 
11,572

 
567

 
(237
)
 
11,902

Total available for sale securities
$
370,593

 
$
6,951

 
$
(2,543
)
 
$
375,001

 
$
343,093

 
$
8,832

 
$
(3,371
)
 
$
348,554

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
1,009

 
$
61

 
$
—

 
$
1,070

 
$
1,010

 
$
63

 
$
—

 
$
1,073

Agency mortgage-backed securities
158,432

 
4,011

 
(69
)
 
162,374

 
159,522

 
5,422

 
—

 
164,944

Agency collateralized mortgage obligations
224,994

 
1,885

 
(2,754
)
 
224,125

 
198,220

 
1,842

 
(3,478
)
 
196,584

State, county, and municipal securities
225

 
2

 
—

 
227

 
424

 
4

 
—

 
428

Single issuer trust preferred securities issued by banks
1,500

 
—

 
—

 
1,500

 
1,500

 
—

 
(23
)
 
1,477

Small business administration pooled securities

37,178

 
341

 
(103
)
 
37,416

 
9,775

 
299

 
—

 
10,074

Corporate debt securities
5,001

 
65

 
—

 
5,066

 
5,002

 
117

 
—

 
5,119

Total held to maturity securities
$
428,339

 
$
6,365

 
$
(2,926
)
 
$
431,778

 
$
375,453

 
$
7,747

 
$
(3,501
)
 
$
379,699

Total
$
798,932

 
$
13,316

 
$
(5,469
)
 
$
806,779

 
$
718,546

 
$
16,579

 
$
(6,872
)
 
$
728,253


(1)    Gross unrealized gains and gross unrealized losses include $230,000 of net non-credit related other-than-temporary impairment ("OTTI") at December 31, 2014. There was no non-credit related OTTI at June 30, 2015.
Schedule of contractual maturities of securities
A schedule of the contractual maturities of securities available for sale and securities held to maturity as of June 30, 2015 is presented below:

 
Available for Sale
 
Held to Maturity
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
(Dollars in thousands)
Due in one year or less
$
—

 
$
—

 
$
5,226

 
$
5,293

Due after one year to five years
46,469

 
47,097

 
149

 
152

Due after five to ten years
92,147

 
92,354

 
29,960

 
30,547

Due after ten years
218,776

 
222,106

 
393,004

 
395,786

Total debt securities
$
357,392

 
$
361,557

 
$
428,339

 
$
431,778

Equity securities
$
13,201

 
$
13,444

 
$
—

 
$
—

Total
$
370,593

 
$
375,001

 
$
428,339

 
$
431,778
Schedule of gross unrealized losses and fair value of investments
The following tables show the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company has not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
June 30, 2015
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
Agency mortgage-backed securities
40

 
$
76,234

 
$
(766
)
 
$
4,542

 
$
(180
)
 
$
80,776

 
$
(946
)
Agency collateralized mortgage obligations
14

 
45,813

 
(329
)
 
88,668

 
(2,941
)
 
134,481

 
(3,270
)
Single issuer trust preferred securities issued by banks and insurers
2

 
2,113

 
(28
)
 
—

 
—

 
2,113

 
(28
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,595

 
(651
)
 
1,595

 
(651
)
Small business administration pooled securities
3

 
39,349

 
(238
)
 
—

 
—

 
39,349

 
(238
)
Equity securities
26

 
2,717

 
(123
)
 
4,330

 
(213
)
 
7,047

 
(336
)
Total temporarily impaired securities
86

 
$
166,226

 
$
(1,484
)
 
$
99,135

 
$
(3,985
)
 
$
265,361

 
$
(5,469
)

 
December 31, 2014
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
U.S.government agency securities
22

 
$
21,950

 
$
(22
)
 
$
—

 
$
—

 
$
21,950

 
$
(22
)
Agency mortgage-backed securities
17

 
3,471

 
(1
)
 
42,222

 
(692
)
 
45,693

 
(693
)
Agency collateralized mortgage obligations
14

 
35,083

 
(331
)
 
94,974

 
(3,770
)
 
130,057

 
(4,101
)
Single issuer trust preferred securities issued by banks and insurers
2

 
2,553

 
(39
)
 
—

 
—

 
2,553

 
(39
)
Pooled trust preferred securities issued by banks and insurers
2

 
—

 
—

 
2,681

 
(1,356
)
 
2,681

 
(1,356
)
Equity securities
23

 
1,480

 
(74
)
 
4,072

 
(163
)
 
5,552

 
(237
)
Total temporarily impaired securities
80

 
$
64,537

 
$
(467
)
 
$
143,949

 
$
(5,981
)
 
$
208,486

 
$
(6,448
)
Schedule of Other Than Temorary Impairment [Table Text Block]
The following table shows the total OTTI that the Company recorded for the periods indicated:
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2015
 
2014
 
2015
 
2014
 
(Dollars in thousands)
Gross change in OTTI recorded on certain investments
$
—

 
$
196

 
$
84

 
$
1,029

Portion of OTTI recognized in OCI
—

 
(196
)
 
(84
)
 
(1,029
)
Total credit related OTTI recognized in earnings
$
—

 
$
—

 
$
—

 
$
—
Summary of cumulative credit related component of OTTI
The following table shows the cumulative credit related component of OTTI for the periods indicated:
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2015
 
2014
 
2015
 
2014
 
(Dollars in thousands)
Balance at beginning of period
$
(9,997
)
 
$
(9,997
)
 
$
(9,997
)
 
$
(9,997
)
Add
 
 
 
 
 
 
 
Incurred on securities not previously impaired
—

 
—

 
—

 
—

Incurred on securities previously impaired
—

 
—

 
—

 
—

Less
 
 
 
 
 
 
 
Securities sold during the period
9,997

 
—

 
9,997

 
—

Reclassification due to changes in Company's intent
—

 
—

 
—

 
—

Increases in cash flow expected to be collected
—

 
—

 
—

 
—

Balance at end of period
$
—

 
$
(9,997
)
 
$
—

 
$
(9,997
)