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Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Gain (Loss) on Investments [Line Items]  
Reconciliation of fair value of securities
The following table presents a summary of the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated:
 
June 30, 2017
 
December 31, 2016
 
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
$
24,009

 
$
269

 
$
—

 
$
24,278

 
$
24,006

 
$
238

 
$
—

 
$
24,244

Agency mortgage-backed securities
189,780

 
3,065

 
(175
)
 
192,670

 
173,268

 
2,852

 
(736
)
 
175,384

Agency collateralized mortgage obligations
121,292

 
433

 
(1,028
)
 
120,697

 
101,094

 
106

 
(1,332
)
 
99,868

State, county, and municipal securities
3,723

 
52

 
—

 
3,775

 
3,743

 
50

 
—

 
3,793

Single issuer trust preferred securities issued by banks
2,285

 
43

 
—

 
2,328

 
2,311

 
3

 
(3
)
 
2,311

Pooled trust preferred securities issued by banks and insurers
2,202

 
—

 
(609
)
 
1,593

 
2,200

 
—

 
(616
)
 
1,584

Small business administration pooled securities
51,044

 
—

 
(265
)
 
50,779

 
37,561

 
—

 
(372
)
 
37,189

Equity securities
19,161

 
1,086

 
(424
)
 
19,823

 
19,183

 
641

 
(553
)
 
19,271

Total available for sale securities
$
413,496

 
$
4,948

 
$
(2,501
)
 
$
415,943

 
$
363,366

 
$
3,890

 
$
(3,612
)
 
$
363,644

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
1,006

 
$
46

 
$
—

 
$
1,052

 
$
1,007

 
$
47

 
$
—

 
$
1,054

Agency mortgage-backed securities
178,358

 
2,506

 
(416
)
 
180,448

 
156,088

 
2,274

 
(858
)
 
157,504

Agency collateralized mortgage obligations
288,428

 
1,285

 
(2,881
)
 
286,832

 
297,445

 
1,002

 
(3,797
)
 
294,650

Single issuer trust preferred securities issued by banks
1,500

 
37

 
—

 
1,537

 
1,500

 
44

 
—

 
1,544

Small business administration pooled securities
29,100

 
247

 
(157
)
 
29,190

 
31,036

 
189

 
(327
)
 
30,898

Total held to maturity securities
$
498,392

 
$
4,121

 
$
(3,454
)
 
$
499,059

 
$
487,076

 
$
3,556

 
$
(4,982
)
 
$
485,650

Total
$
911,888

 
$
9,069

 
$
(5,955
)
 
$
915,002

 
$
850,442

 
$
7,446

 
$
(8,594
)
 
$
849,294
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, 2017 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
$
3,660

 
$
3,672

 
$
—

 
$
—

Due after one year to five years
35,607

 
36,122

 
15,824

 
16,064

Due after five to ten years
96,985

 
97,760

 
19,574

 
20,045

Due after ten years
258,083

 
258,566

 
462,994

 
462,950

Total debt securities
$
394,335

 
$
396,120

 
$
498,392

 
$
499,059

Equity securities
$
19,161

 
$
19,823

 
$
—

 
$
—

Total
$
413,496

 
$
415,943

 
$
498,392

 
$
499,059
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, 2017
 
 
 
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
36

 
$
111,741

 
$
(589
)
 
$
325

 
$
(2
)
 
$
112,066

 
$
(591
)
Agency collateralized mortgage obligations
25

 
163,824

 
(2,228
)
 
44,015

 
(1,681
)
 
207,839

 
(3,909
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,593

 
(609
)
 
1,593

 
(609
)
Small business administration pooled securities
6

 
72,140

 
(422
)
 
—

 
—

 
72,140

 
(422
)
Equity securities
21

 
1,703

 
(37
)
 
5,953

 
(387
)
 
7,656

 
(424
)
Total temporarily impaired securities
89

 
$
349,408

 
$
(3,276
)
 
$
51,886

 
$
(2,679
)
 
$
401,294

 
$
(5,955
)

 
December 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
57

 
$
137,949

 
$
(1,594
)
 
$
—

 
$
—

 
$
137,949

 
$
(1,594
)
Agency collateralized mortgage obligations
32

 
243,051

 
(3,140
)
 
47,403

 
(1,989
)
 
290,454

 
(5,129
)
Single issuer trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,036

 
(3
)
 
1,036

 
(3
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,583

 
(616
)
 
1,583

 
(616
)
Small business administration pooled securities
5

 
59,846

 
(699
)
 
—

 
—

 
59,846

 
(699
)
Equity securities
25

 
3,625

 
(77
)
 
6,334

 
(476
)
 
9,959

 
(553
)
Total temporarily impaired securities
121

 
$
444,471

 
$
(5,510
)
 
$
56,356

 
$
(3,084
)
 
$
500,827

 
$
(8,594
)