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Securities (Tables)
 9 Months Ended
Sep. 30, 2015
Gain (Loss) on Investments [Line Items]  
Realized Gain (Loss) on Investments [Table Text Block]
When securities are sold, the adjusted cost of the specific security sold is used to compute the gain or loss on the sale.
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2015
 
2014
 
2015
 
2014
 
(Dollars in thousands)
Equity securities classified as available for sale:
 
 
 
 
 
 
 
Gross realized gains
$
—

 
$
67

 
$
19

 
$
138

Gross realized losses
—

 
—

 
(8
)
 
—

Net realized gain on equity securities
$
—

 
$
67

 
$
11

 
$
138

Fixed income securities classified as available for sale:
 
 
 
 
 
 
 
Gross realized gains
$
—

 
$
—

 
$
798

 
$
—

Gross realized losses
—

 
—

 
(1,124
)
 
—

Net realized loss on fixed income securities
$
—

 
$
—

 
$
(326
)
 
$
—
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:
 
September 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
$
36,895

 
$
692

 
$
—

 
$
37,587

 
$
41,369

 
$
139

 
$
(22
)
 
$
41,486

Agency mortgage-backed securities
206,778

 
6,247

 
(104
)
 
212,921

 
211,168

 
7,203

 
(693
)
 
217,678

Agency collateralized mortgage obligations
51,868

 
611

 
(404
)
 
52,075

 
63,059

 
599

 
(623
)
 
63,035

State, county, and municipal securities
4,557

 
114

 
—

 
4,671

 
5,106

 
117

 
—

 
5,223

Single issuer trust preferred securities issued by banks
2,877

 
9

 
(45
)
 
2,841

 
2,913

 
12

 
(16
)
 
2,909

Pooled trust preferred securities issued by banks and insurers (1)
2,226

 
—

 
(640
)
 
1,586

 
7,906

 
195

 
(1,780
)
 
6,321

Small business administration pooled securities

41,018

 
155

 
(17
)
 
41,156

 
—

 
—

 
—

 
—

Equity securities
13,200

 
245

 
(490
)
 
12,955

 
11,572

 
567

 
(237
)
 
11,902

Total available for sale securities
$
359,419

 
$
8,073

 
$
(1,700
)
 
$
365,792

 
$
343,093

 
$
8,832

 
$
(3,371
)
 
$
348,554

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

 
$
75

 
$
—

 
$
1,084

 
$
1,010

 
$
63

 
$
—

 
$
1,073

Agency mortgage-backed securities
172,684

 
5,718

 
—

 
178,402

 
159,522

 
5,422

 
—

 
164,944

Agency collateralized mortgage obligations
230,820

 
2,769

 
(1,679
)
 
231,910

 
198,220

 
1,842

 
(3,478
)
 
196,584

State, county, and municipal securities
225

 
4

 
—

 
229

 
424

 
4

 
—

 
428

Single issuer trust preferred securities issued by banks
1,500

 
—

 
(4
)
 
1,496

 
1,500

 
—

 
(23
)
 
1,477

Small business administration pooled securities

36,901

 
712

 
—

 
37,613

 
9,775

 
299

 
—

 
10,074

Corporate debt securities
5,000

 
42

 
—

 
5,042

 
5,002

 
117

 
—

 
5,119

Total held to maturity securities
$
448,139

 
$
9,320

 
$
(1,683
)
 
$
455,776

 
$
375,453

 
$
7,747

 
$
(3,501
)
 
$
379,699

Total
$
807,558

 
$
17,393

 
$
(3,383
)
 
$
821,568

 
$
718,546

 
$
16,579

 
$
(6,872
)
 
$
728,253


(1)    Gross unrealized gains and gross unrealized losses include $230,000 of a net loss on non-credit related other-than-temporary impairment ("OTTI") at December 31, 2014. There was no non-credit related OTTI at September 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 September 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
$
—

 
$
—

 
$
5,225

 
$
5,271

Due after one year to five years
42,709

 
43,495

 
118

 
120

Due after five to ten years
81,841

 
83,361

 
29,013

 
29,954

Due after ten years
221,669

 
225,981

 
413,783

 
420,431

Total debt securities
$
346,219

 
$
352,837

 
$
448,139

 
$
455,776

Equity securities
$
13,200

 
$
12,955

 
$
—

 
$
—

Total
$
359,419

 
$
365,792

 
$
448,139

 
$
455,776
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:
 
September 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
8

 
$
6,886

 
$
(18
)
 
$
4,515

 
$
(86
)
 
$
11,401

 
$
(104
)
Agency collateralized mortgage obligations
12

 
16,667

 
(135
)
 
85,255

 
(1,948
)
 
101,922

 
(2,083
)
Single issuer trust preferred securities issued by banks and insurers
3

 
2,541

 
(15
)
 
1,039

 
(34
)
 
3,580

 
(49
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,586

 
(640
)
 
1,586

 
(640
)
Small business administration pooled securities
1

 
11,982

 
(17
)
 
—

 
—

 
11,982

 
(17
)
Equity securities
33

 
2,627

 
(178
)
 
5,018

 
(312
)
 
7,645

 
(490
)
Total temporarily impaired securities
58

 
$
40,703

 
$
(363
)
 
$
97,413

 
$
(3,020
)
 
$
138,116

 
$
(3,383
)

 
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
)
Summary of cumulative credit related component of OTTI
The following table shows the total OTTI that the Company recorded for the periods indicated:
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2015
 
2014
 
2015
 
2014
 
(Dollars in thousands)
Gross change in OTTI recorded on certain investments
$
—

 
$
235

 
$
84

 
$
1,264

Portion of OTTI recognized in OCI
—

 
(235
)
 
(84
)
 
(1,264
)
Total credit related OTTI recognized in earnings
$
—

 
$
—

 
$
—

 
$
—

The following table shows the cumulative credit related component of OTTI for the periods indicated:
 
Three Months Ended
 
Nine Months Ended
 
September 30
 
September 30
 
2015
 
2014
 
2015
 
2014
 
(Dollars in thousands)
Balance at beginning of period
$
—

 
$
(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

 
—

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
)