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Securities Available-for-Sale (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Composition of Securities Available-for-Sale
The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:
 
December 31, 2017
 
December 31, 2016
(dollars in thousands)
Amortized
Cost

 
Gross
Unrealized
Gains

 
Gross
Unrealized
Losses

 
Fair Value

 
Amortized
Cost

 
Gross
Unrealized
Gains

 
Gross
Unrealized
Losses

 
Fair Value

U.S. Treasury securities
$
19,943

 
$
—

 
$
(154
)
 
$
19,789

 
$
24,891

 
$
47

 
$
(127
)
 
$
24,811

Obligations of U.S. government corporations and agencies
162,045

 
341

 
(193
)
 
162,193

 
230,989

 
1,573

 
(383
)
 
232,179

Collateralized mortgage obligations of U.S. government corporations and agencies
109,916

 
93

 
(1,321
)
 
108,688

 
130,046

 
465

 
(734
)
 
129,777

Residential mortgage-backed securities of U.S. government corporations and agencies
32,388

 
679

 
(213
)
 
32,854

 
36,606

 
984

 
(232
)
 
37,358

Commercial mortgage-backed securities of U.S. government corporations and agencies(1)
244,018

 
247

 
(2,044
)
 
242,221

 
127,311

 
243

 
(1,950
)
 
125,604

Obligations of states and political subdivisions
123,159

 
4,285

 
(42
)
 
127,402

 
128,783

 
3,772

 
(46
)
 
132,509

Debt Securities
691,469

 
5,645

 
(3,967
)
 
693,147

 
678,626

 
7,084

 
(3,472
)
 
682,238

Marketable equity securities
3,815

 
1,330

 
(1
)
 
5,144

 
7,579

 
3,670

 
—

 
11,249

Total
$
695,284

 
$
6,975

 
$
(3,968
)
 
$
698,291

 
$
686,205

 
$
10,754

 
$
(3,472
)
 
$
693,487


(1)Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.
Schedule of Gross and Net Realized Gains and Losses on Sale of Securities
The following table shows the composition of gross and net realized gains and losses for the periods presented:
 
Years ended December 31,
(dollars in thousands)
2017

 
2016

 
2015

Gross realized gains
$
3,986

 
$
—

 
$
—

Gross realized losses
(986
)
 
—

 
(34
)
Net Realized (Losses) Gains
$
3,000

 
$
—

 
$
(34
)
Fair Value and Age of Gross Unrealized Losses by Investment Category
The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:
 
December 31, 2017
 
Less Than 12 Months
 
12 Months or More
 
 
 
Total
(dollars in thousands)
Number
of
Securities

 
Fair
Value

 
Unrealized
Losses

 
Number
of
Securities

 
Fair
Value

 
Unrealized
Losses

 
Number
of
Securities

 
Fair
Value

 
Unrealized
Losses

U.S. Treasury securities
3

 
$
19,789

 
$
(154
)
 
—

 
$
—

 
$
—

 
3

 
$
19,789

 
$
(154
)
Obligations of U.S. government corporations and agencies
9

 
63,635

 
(144
)
 
1

 
10,017

 
(49
)
 
10

 
73,652

 
(193
)
Collateralized mortgage obligations of U.S. government corporations and agencies
7

 
47,465

 
(248
)
 
7

 
45,809

 
(1,073
)
 
14

 
93,274

 
(1,321
)
Residential mortgage-backed securities of U.S. government corporations and agencies
1

 
2,333

 
(10
)
 
2

 
8,638

 
(203
)
 
3

 
10,971

 
(213
)
Commercial mortgage-backed securities of U.S. government corporations and agencies
14

 
128,300

 
(775
)
 
5

 
48,746

 
(1,269
)
 
19

 
177,046

 
(2,044
)
Obligations of states and political subdivisions
2

 
10,330

 
(42
)
 
—

 
—

 
—

 
2

 
10,330

 
(42
)
Debt Securities
36

 
271,852

 
(1,373
)
 
15

 
113,210

 
(2,594
)
 
51

 
385,062

 
(3,967
)
Marketable equity securities
1

 
70

 
(1
)
 
—

 
—

 
—

 
1

 
70

 
(1
)
Total Temporarily Impaired Securities
37

 
$
271,922

 
$
(1,374
)
 
15

 
$
113,210

 
$
(2,594
)
 
52

 
$
385,132

 
$
(3,968
)
 
December 31, 2016
 
Less Than 12 Months
 
12 Months or More
 
 
 
Total
(dollars in thousands)
Number
of
Securities

 
Fair 
Value

 
Unrealized
Losses

 
Number
of
Securities

 
Fair
Value

 
Unrealized
Losses

 
Number
of
Securities

 
Fair
Value

 
Unrealized
Losses

U.S. Treasury securities
1

 
$
9,811

 
$
(127
)
 
—

 
$
—

 
$
—

 
1

 
$
9,811

 
$
(127
)
Obligations of U.S. government corporations and agencies
7

 
62,483

 
(383
)
 
—

 
—

 
—

 
7

 
62,483

 
(383
)
Collateralized mortgage obligations of U.S. government corporations and agencies
10

 
83,031

 
(734
)
 
—

 
—

 
—

 
10

 
83,031

 
(734
)
Residential mortgage-backed securities of U.S. government corporations and agencies
2

 
10,022

 
(232
)
 
—

 
—

 
—

 
2

 
10,022

 
(232
)
Commercial mortgage-backed securities of U.S. government corporations and agencies
10

 
96,576

 
(1,950
)
 
—

 
—

 
—

 
10

 
96,576

 
(1,950
)
Obligations of states and political subdivisions
1

 
5,577

 
(46
)
 
—

 
—

 
—

 
1

 
5,577

 
(46
)
Debt Securities
31

 
267,500

 
(3,472
)
 
—

 
—

 
—

 
31

 
267,500

 
(3,472
)
Marketable equity securities
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total Temporarily Impaired Securities
31

 
$
267,500

 
$
(3,472
)
 
—

 
$
—

 
$
—

 
31

 
$
267,500

 
$
(3,472
)
Unrealized Gain (Loss) on Investments
The following table displays net unrealized gains and losses, net of tax, on securities available-for-sale included in accumulated other comprehensive income/(loss), for the periods presented:
 
December 31, 2017
 
December 31, 2016
(dollars in thousands)
Gross Unrealized Gains

 
Gross Unrealized Losses

 
Net Unrealized Gains (Losses)

 
Gross Unrealized Gains

 
Gross Unrealized Losses

 
Net Unrealized Gains (Losses)

Total unrealized gains (losses) on securities available for sale
$
6,975

 
$
(3,968
)
 
$
3,007

 
$
10,754

 
$
(3,472
)
 
$
7,282

Income tax (expense) benefit
(2,450
)
 
1,394

 
(1,056
)
 
(3,776
)
 
1,219

 
(2,557
)
Net unrealized gains (losses), net of tax included in accumulated other comprehensive income(loss)
$
4,525

 
$
(2,574
)
 
$
1,951

 
$
6,978

 
$
(2,253
)
 
$
4,725
Amortized Cost and Fair Value of Available-for-Sale Securities
The amortized cost and fair value of securities available-for-sale at December 31, 2017 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
December 31, 2017
(dollars in thousands)
Amortized
Cost

 
Fair Value

Due in one year or less
$
58,501

 
$
58,438

Due after one year through five years
141,646

 
142,859

Due after five years through ten years
70,584

 
72,132

Due after ten years
34,416

 
35,955

 
305,147

 
309,384

Collateralized mortgage obligations of U.S. government corporations and agencies
109,916

 
108,688

Residential mortgage-backed securities of U.S. government corporations and agencies
32,388

 
32,854

Commercial mortgage-backed securities of U.S. government corporations and agencies
244,018

 
242,221

Debt Securities
691,469

 
693,147

Marketable equity securities
3,815

 
5,144

Total
$
695,284

 
$
698,291