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Investment securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of investment securities
Investment securities at December 31, 2016 and 2015 consisted of the following (dollars in thousands):
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair value
2016
 

 
 

 
 

 
 

Available-for-sale
 

 
 

 
 

 
 

U.S. Agency mortgage-backed securities (MBS)
$
165,933

 
$
1,828

 
$
(799
)
 
$
166,962

Non-agency MBS
252,153

 
203

 
(3,408
)
 
248,948

U.S. Agency asset-backed securities
6,700

 
419

 
(57
)
 
7,062

Corporate securities
71,213

 
397

 
(287
)
 
71,323

Mutual fund
537

 
—

 
(13
)
 
524

 
$
496,536

 
$
2,847

 
$
(4,564
)
 
$
494,819

Held-to-maturity
 

 
 

 
 

 
 

U.S. Agency mortgage-backed securities (MBS)
$
101,563

 
$
1,195

 
$
(148
)
 
$
102,610

Tax credit investments
287

 
—

 
—

 
287

Obligations of state and political subdivisions
38,707

 
770

 
(102
)
 
39,375

 
$
140,557

 
$
1,965

 
$
(250
)
 
$
142,272

 
 
 
 
 
 
 
 
2015
 

 
 

 
 

 
 

Available-for-sale
 

 
 

 
 

 
 

U.S. Agency MBS
$
154,691

 
$
2,698

 
$
(455
)
 
$
156,934

Non-agency MBS
118,765

 
477

 
(1,016
)
 
118,226

U.S. Agency asset-backed securities
7,468

 
800

 
(23
)
 
8,245

Corporate securities
26,199

 
121

 
—

 
26,320

Mutual fund
525

 
12

 
—

 
537

 
$
307,648

 
$
4,108

 
$
(1,494
)
 
$
310,262

Held-to-maturity
 

 
 

 
 

 
 

U.S. Agency mortgage-backed securities (MBS)
$
98,800

 
$
1,875

 
$
(5
)
 
$
100,670

Tax credit investments
421

 
—

 
—

 
421

Obligations of state and political subdivisions
40,203

 
968

 
(2
)
 
41,169

 
$
139,424

 
$
2,843

 
$
(7
)
 
$
142,260

 
Investment securities, continuous unrealized loss position
The following table presents the fair value and gross unrealized losses of the Bank’s investment securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2016 and 2015 (dollars in thousands):
 
Less than 12 months
 
12 months or more
 
Total
 
Estimated 
fair value
 
Unrealized
losses
 
Estimated 
fair value
 
Unrealized
losses
 
Estimated 
fair value
 
Unrealized
losses
2016
 

 
 

 
 

 
 

 
 

 
 

Available-for-sale
 
 
 
 
 
 
 
 
 
 
 
U.S. Agency MBS
$
51,082

 
$
(786
)
 
$
1,733

 
$
(13
)
 
$
52,815

 
$
(799
)
Non-Agency MBS
211,909

 
(3,268
)
 
1,933

 
(140
)
 
213,842

 
(3,408
)
U.S. Agency asset-backed securities
—

 
—

 
1,918

 
(57
)
 
1,918

 
(57
)
Corporate securities
6,709

 
(287
)
 
—

 
—

 
6,709

 
(287
)
Mutual fund
524

 
(13
)
 
—

 
—

 
524

 
(13
)
 
$
270,224

 
$
(4,354
)
 
$
5,584

 
$
(210
)
 
$
275,808

 
$
(4,564
)
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity
 
 
 
 
 
 
 
 
 
 
 
U.S. Agency MBS
$
7,641

 
$
(148
)
 
$
—

 
$
—

 
$
7,641

 
$
(148
)
Obligations of state and political subdivisions
1,942

 
(102
)
 
—

 
—

 
1,942

 
(102
)
 
$
9,583

 
$
(250
)
 
$
—

 
$
—

 
$
9,583

 
$
(250
)
2015
 

 
 

 
 

 
 

 
 

 
 

Available-for-sale
 
 
 
 
 
 
 
 
 
 
 
U.S. Agency MBS
$
23,630

 
$
(123
)
 
$
34,576

 
$
(332
)
 
$
58,206

 
$
(455
)
Non-Agency MBS
66,412

 
(765
)
 
12,225

 
(251
)
 
78,637

 
(1,016
)
U.S. Agency asset-backed securities
—

 
—

 
1,521

 
(23
)
 
1,521

 
(23
)
 
$
90,042

 
$
(888
)
 
$
48,322

 
$
(606
)
 
$
138,364

 
$
(1,494
)
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity
 
 
 
 
 
 
 
 
 
 
 
U.S. Agency MBS
$
2,063

 
$
(5
)
 
$
—

 
$
—

 
$
2,063

 
$
(5
)
Obligations of state and political subdivisions
725

 
(2
)
 
—

 
—

 
725

 
(2
)
 
$
2,788

 
$
(7
)
 
$
—

 
$
—

 
$
2,788

 
$
(7
)
Investments classified by contractual maturity date
The amortized cost and estimated fair value of investment securities at December 31, 2016, by contractual maturity, are shown below (dollars in thousands). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
Available-for-sale
 
Held-to-maturity
 
Amortized
cost
 
Estimated
fair value
 
Amortized
cost
 
Estimated
fair value
Due in one year or less
$
3,397

 
$
3,411

 
$
—

 
$
—

Due after one year through five years
75,489

 
75,632

 
34,955

 
35,205

Due after five years through ten years
37,600

 
37,341

 
87,817

 
89,323

Due after ten years
379,513

 
377,911

 
17,498

 
17,457

Mutual fund
537

 
524

 
—

 
—

Tax credit investments
—

 
—

 
287

 
287

 
$
496,536

 
$
494,819

 
$
140,557

 
$
142,272