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Securities (Tables)
 9 Months Ended
Sep. 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:
 
September 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
$
23,010

 
$
218

 
$
—

 
$
23,228

 
$
24,006

 
$
238

 
$
—

 
$
24,244

Agency mortgage-backed securities
211,757

 
3,060

 
(253
)
 
214,564

 
173,268

 
2,852

 
(736
)
 
175,384

Agency collateralized mortgage obligations
115,504

 
405

 
(1,080
)
 
114,829

 
101,094

 
106

 
(1,332
)
 
99,868

State, county, and municipal securities
2,492

 
47

 
—

 
2,539

 
3,743

 
50

 
—

 
3,793

Single issuer trust preferred securities issued by banks
2,025

 
19

 
—

 
2,044

 
2,311

 
3

 
(3
)
 
2,311

Pooled trust preferred securities issued by banks and insurers
2,182

 
—

 
(558
)
 
1,624

 
2,200

 
—

 
(616
)
 
1,584

Small business administration pooled securities
50,194

 
45

 
(53
)
 
50,186

 
37,561

 
—

 
(372
)
 
37,189

Equity securities
19,176

 
1,334

 
(399
)
 
20,111

 
19,183

 
641

 
(553
)
 
19,271

Total available for sale securities
$
426,340

 
$
5,128

 
$
(2,343
)
 
$
429,125

 
$
363,366

 
$
3,890

 
$
(3,612
)
 
$
363,644

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

 
$
42

 
$
—

 
$
1,048

 
$
1,007

 
$
47

 
$
—

 
$
1,054

Agency mortgage-backed securities
171,664

 
2,508

 
(192
)
 
173,980

 
156,088

 
2,274

 
(858
)
 
157,504

Agency collateralized mortgage obligations
275,894

 
1,244

 
(2,905
)
 
274,233

 
297,445

 
1,002

 
(3,797
)
 
294,650

Single issuer trust preferred securities issued by banks
1,500

 
39

 
—

 
1,539

 
1,500

 
44

 
—

 
1,544

Small business administration pooled securities
28,734

 
228

 
(100
)
 
28,862

 
31,036

 
189

 
(327
)
 
30,898

Total held to maturity securities
$
478,798

 
$
4,061

 
$
(3,197
)
 
$
479,662

 
$
487,076

 
$
3,556

 
$
(4,982
)
 
$
485,650

Total
$
905,138

 
$
9,189

 
$
(5,540
)
 
$
908,787

 
$
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 September 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
$
3,229

 
$
3,237

 
$
—

 
$
—

Due after one year to five years
36,704

 
37,152

 
15,731

 
15,917

Due after five to ten years
105,842

 
106,576

 
18,158

 
18,654

Due after ten years
261,389

 
262,049

 
444,909

 
445,091

Total debt securities
$
407,164

 
$
409,014

 
$
478,798

 
$
479,662

Equity securities
$
19,176

 
$
20,111

 
$
—

 
$
—

Total
$
426,340

 
$
429,125

 
$
478,798

 
$
479,662
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, 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
23

 
$
88,083

 
$
(438
)
 
$
762

 
$
(7
)
 
$
88,845

 
$
(445
)
Agency collateralized mortgage obligations
25

 
145,572

 
(2,278
)
 
52,466

 
(1,707
)
 
198,038

 
(3,985
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,624

 
(558
)
 
1,624

 
(558
)
Small business administration pooled securities
4

 
46,925

 
(153
)
 
—

 
—

 
46,925

 
(153
)
Equity securities
24

 
897

 
(17
)
 
7,557

 
(382
)
 
8,454

 
(399
)
Total temporarily impaired securities
77

 
$
281,477

 
$
(2,886
)
 
$
62,409

 
$
(2,654
)
 
$
343,886

 
$
(5,540
)

 
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
)