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Securities (Tables)
 6 Months Ended
Jun. 30, 2016
Gain (Loss) on Investments [Line Items]  
Reconciliation of fair value of securities
The following table presents a summary of the amortized cost and gross unrealized holding gains and losses recorded in other comprehensive income and fair value of securities available for sale and securities held to maturity for the periods below:
 
June 30, 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
$
26,988

 
$
953

 
$
—

 
$
27,941

 
$
29,958

 
$
261

 
$
(4
)
 
$
30,215

Agency mortgage-backed securities
186,221

 
8,230

 
(3
)
 
194,448

 
207,693

 
4,227

 
(983
)
 
210,937

Agency collateralized mortgage obligations
102,381

 
1,712

 
(123
)
 
103,970

 
64,157

 
179

 
(752
)
 
63,584

State, county, and municipal securities
4,267

 
129

 
—

 
4,396

 
4,543

 
116

 
—

 
4,659

Single issuer trust preferred securities issued by banks
2,337

 
5

 
(78
)
 
2,264

 
2,865

 
8

 
(81
)
 
2,792

Pooled trust preferred securities issued by banks and insurers
2,209

 
—

 
(703
)
 
1,506

 
2,217

 
—

 
(645
)
 
1,572

Small business administration pooled securities

39,252

 
1,212

 
—

 
40,464

 
40,472

 
87

 
(110
)
 
40,449

Equity securities
14,367

 
755

 
(287
)
 
14,835

 
13,235

 
374

 
(568
)
 
13,041

Total available for sale securities
$
378,022

 
$
12,996

 
$
(1,194
)
 
$
389,824

 
$
365,140

 
$
5,252

 
$
(3,143
)
 
$
367,249

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

 
$
92

 
$
—

 
$
1,100

 
$
1,009

 
$
55

 
$
—

 
$
1,064

Agency mortgage-backed securities
155,468

 
6,974

 
—

 
162,442

 
167,134

 
3,460

 
(219
)
 
170,375

Agency collateralized mortgage obligations
247,313

 
5,316

 
(446
)
 
252,183

 
267,348

 
1,195

 
(3,652
)
 
264,891

State, county, and municipal securities
—

 
—

 
—

 
—

 
225

 
2

 
—

 
227

Single issuer trust preferred securities issued by banks
1,500

 
46

 
—

 
1,546

 
1,500

 
22

 
—

 
1,522

Small business administration pooled securities

33,367

 
1,282

 
—

 
34,649

 
35,291

 
437

 
(64
)
 
35,664

Corporate debt securities
—

 
—

 
—

 
—

 
5,000

 
6

 
—

 
5,006

Total held to maturity securities
$
438,656

 
$
13,710

 
$
(446
)
 
$
451,920

 
$
477,507

 
$
5,177

 
$
(3,935
)
 
$
478,749

Total
$
816,678

 
$
26,706

 
$
(1,640
)
 
$
841,744

 
$
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 June 30, 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
$
—

 
$
—

 
$
32

 
$
32

Due after one year to five years
24,601

 
25,143

 
16,186

 
16,973

Due after five to ten years
96,138

 
99,926

 
26,469

 
27,595

Due after ten years
242,916

 
249,920

 
395,969

 
407,320

Total debt securities
$
363,655

 
$
374,989

 
$
438,656

 
$
451,920

Equity securities
$
14,367

 
$
14,835

 
$
—

 
$
—

Total
$
378,022

 
$
389,824

 
$
438,656

 
$
451,920
Schedule of gross unrealized losses and fair value of investments
 
June 30, 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
1

 
$
434

 
$
(3
)
 
$
—

 
$
—

 
$
434

 
$
(3
)
Agency collateralized mortgage obligations
7

 
—

 
—

 
54,467

 
(569
)
 
54,467

 
(569
)
Single issuer trust preferred securities issued by banks and insurers
2

 
—

 
—

 
2,014

 
(78
)
 
2,014

 
(78
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,506

 
(703
)
 
1,506

 
(703
)
Equity securities
25

 
408

 
(22
)
 
6,391

 
(265
)
 
6,799

 
(287
)
Total temporarily impaired securities
36

 
$
842

 
$
(25
)
 
$
64,378

 
$
(1,615
)
 
$
65,220

 
$
(1,640
)

 
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
 
Six Months Ended
 
June 30
 
June 30
 
2016
 
2015
 
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
 
Six Months Ended
 
June 30
 
June 30
 
2016
 
2015
 
2016
 
2015
 
(Dollars in thousands)
Balance at beginning of period
$
—

 
$
(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
$
—

 
$
—

 
$
—

 
$
—