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Securities (Tables)
 3 Months Ended
Mar. 31, 2016
Gain (Loss) on Investments [Line Items]  
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:
 
March 31, 2016
 
December 31, 2015
 
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
$
29,466

 
$
856

 
$
—

 
$
30,322

 
$
29,958

 
$
261

 
$
(4
)
 
$
30,215

Agency mortgage-backed securities
200,081

 
6,950

 
(20
)
 
207,011

 
207,693

 
4,227

 
(983
)
 
210,937

Agency collateralized mortgage obligations
76,481

 
1,001

 
(325
)
 
77,157

 
64,157

 
179

 
(752
)
 
63,584

State, county, and municipal securities
4,529

 
127

 
—

 
4,656

 
4,543

 
116

 
—

 
4,659

Single issuer trust preferred securities issued by banks
2,350

 
8

 
(125
)
 
2,233

 
2,865

 
8

 
(81
)
 
2,792

Pooled trust preferred securities issued by banks and insurers
2,216

 
—

 
(716
)
 
1,500

 
2,217

 
—

 
(645
)
 
1,572

Small business administration pooled securities

39,942

 
849

 
—

 
40,791

 
40,472

 
87

 
(110
)
 
40,449

Equity securities
14,373

 
423

 
(239
)
 
14,557

 
13,235

 
374

 
(568
)
 
13,041

Total available for sale securities
$
369,438

 
$
10,214

 
$
(1,425
)
 
$
378,227

 
$
365,140

 
$
5,252

 
$
(3,143
)
 
$
367,249

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
1,008

 
$
84

 
$
—

 
$
1,092

 
$
1,009

 
$
55

 
$
—

 
$
1,064

Agency mortgage-backed securities
161,452

 
6,123

 
—

 
167,575

 
167,134

 
3,460

 
(219
)
 
170,375

Agency collateralized mortgage obligations
258,620

 
3,866

 
(1,007
)
 
261,479

 
267,348

 
1,195

 
(3,652
)
 
264,891

State, county, and municipal securities
225

 
—

 
—

 
225

 
225

 
2

 
—

 
227

Single issuer trust preferred securities issued by banks
1,500

 
17

 
—

 
1,517

 
1,500

 
22

 
—

 
1,522

Small business administration pooled securities

34,836

 
1,040

 
—

 
35,876

 
35,291

 
437

 
(64
)
 
35,664

Corporate debt securities
—

 
—

 
—

 
—

 
5,000

 
6

 
—

 
5,006

Total held to maturity securities
$
457,641

 
$
11,130

 
$
(1,007
)
 
$
467,764

 
$
477,507

 
$
5,177

 
$
(3,935
)
 
$
478,749

Total
$
827,079

 
$
21,344

 
$
(2,432
)
 
$
845,991

 
$
842,647

 
$
10,429

 
$
(7,078
)
 
$
845,998
Schedule of contractual maturities of securities
A schedule of the contractual maturities of securities available for sale and securities held to maturity as of March 31, 2016 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
$
500

 
$
500

 
$
276

 
$
277

Due after one year to five years
33,068

 
33,743

 
15,263

 
15,875

Due after five to ten years
96,153

 
98,802

 
29,468

 
30,705

Due after ten years
225,344

 
230,625

 
412,634

 
420,907

Total debt securities
$
355,065

 
$
363,670

 
$
457,641

 
$
467,764

Equity securities
$
14,373

 
$
14,557

 
$
—

 
$
—

Total
$
369,438

 
$
378,227

 
$
457,641

 
$
467,764
Schedule of gross unrealized losses and fair value of investments

 
March 31, 2016
 
 
 
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
3

 
$
694

 
$
(2
)
 
$
3,501

 
$
(18
)
 
$
4,195

 
$
(20
)
Agency collateralized mortgage obligations
9

 
—

 
—

 
72,566

 
(1,332
)
 
72,566

 
(1,332
)
Single issuer trust preferred securities issued by banks and insurers
2

 
979

 
(66
)
 
1,000

 
(59
)
 
1,979

 
(125
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,500

 
(716
)
 
1,500

 
(716
)
Equity securities
29

 
2,545

 
(118
)
 
2,249

 
(121
)
 
4,794

 
(239
)
Total temporarily impaired securities
44

 
$
4,218

 
$
(186
)
 
$
80,816

 
$
(2,246
)
 
$
85,034

 
$
(2,432
)

 
December 31, 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)
U.S.government agency securities
3

 
$
1,990

 
$
(4
)
 
$
—

 
$
—

 
$
1,990

 
$
(4
)
Agency mortgage-backed securities
57

 
112,648

 
(1,062
)
 
4,297

 
(140
)
 
116,945

 
(1,202
)
Agency collateralized mortgage obligations
23

 
147,707

 
(1,420
)
 
80,927

 
(2,984
)
 
228,634

 
(4,404
)
Single issuer trust preferred securities issued by banks and insurers
2

 
1,018

 
(33
)
 
1,018

 
(48
)
 
2,036

 
(81
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,572

 
(645
)
 
1,572

 
(645
)
Small business administration pooled securities
3

 
37,986

 
(174
)
 
—

 
—

 
37,986

 
(174
)
Equity securities
34

 
3,481

 
(189
)
 
4,971

 
(379
)
 
8,452

 
(568
)
Total temporarily impaired securities
123

 
$
304,830

 
$
(2,882
)
 
$
92,785

 
$
(4,196
)
 
$
397,615

 
$
(7,078
)
Schedule of Other Than Temporary Impairment [Table Text Block]
The following table shows the total OTTI that the Company recorded for the periods indicated:
 
Three Months Ended
 
March 31
 
2016
 
2015
 
(Dollars in thousands)
Gross change in OTTI recorded on certain investments
$
—

 
$
84

Portion of OTTI recognized in OCI
—

 
(84
)
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
 
March 31
 
2016
 
2015
 
(Dollars in thousands)
Balance at beginning of period
$
—

 
$
(9,997
)
Add
 
 
 
Incurred on securities not previously impaired
—

 
—

Incurred on securities previously impaired
—

 
—

Less
 
 
 
Securities sold during the period
—

 
—

Reclassification due to changes in Company's intent
—

 
—

Increases in cash flow expected to be collected
—

 
—

Balance at end of period
$
—

 
$
(9,997
)