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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The amortized cost and fair value of investment securities available for sale as of September 30, 2018 and December 31, 2017 are as follows:
 
As of September 30, 2018
(dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
 
Fair Value
U.S. Treasury securities
$
100

 
$
—

 
$
—

 
$
100

Obligations of the U.S. government and agencies
196,334

 
17

 
(5,898
)
 
190,453

Obligations of state and political subdivisions
15,890

 
1

 
(92
)
 
15,799

Mortgage-backed securities
292,005

 
344

 
(7,928
)
 
284,421

Collateralized mortgage obligations
37,811

 
—

 
(1,618
)
 
36,193

Other investment securities
1,100

 
—

 
(2
)
 
1,098

Total
$
543,240

 
$
362

 
$
(15,538
)
 
$
528,064

 
As of December 31, 2017
(dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
 
Fair Value
U.S. Treasury securities
$
200,077

 
$
11

 
$
—

 
$
200,088

Obligations of the U.S. government and agencies
153,028

 
75

 
(2,059
)
 
151,044

Obligations of state and political subdivisions
21,352

 
11

 
(53
)
 
21,310

Mortgage-backed securities
275,958

 
887

 
(1,855
)
 
274,990

Collateralized mortgage obligations
37,596

 
14

 
(948
)
 
36,662

Other investment securities
4,813

 
318

 
(23
)
 
5,108

Total
$
692,824

 
$
1,316

 
$
(4,938
)
 
$
689,202
Summary of Available-for-sale Debt Securities, Unrealized Loss Position, Fair Value
The following tables present the aggregate amount of gross unrealized losses as of September 30, 2018 and December 31, 2017 on available for sale investment securities classified according to the amount of time those securities have been in a continuous unrealized loss position:
 
As of September 30, 2018
 
Less than 12
Months
 
12 Months
or Longer
 
Total
(dollars in thousands)
Fair
Value
 
Unrealized Losses
 
Fair
Value
 
Unrealized Losses
 
Fair
Value
 
Unrealized Losses
Obligations of the U.S. government and agencies
$
82,187

 
$
(1,634
)
 
$
107,601

 
$
(4,264
)
 
$
189,788

 
$
(5,898
)
Obligations of state and political subdivisions
11,009

 
(21
)
 
2,303

 
(71
)
 
13,312

 
(92
)
Mortgage-backed securities
136,170

 
(3,037
)
 
130,269

 
(4,891
)
 
266,439

 
(7,928
)
Collateralized mortgage obligations
10,939

 
(86
)
 
24,945

 
(1,532
)
 
35,884

 
(1,618
)
Other investment securities
549

 
(1
)
 
249

 
(1
)
 
798

 
(2
)
Total
$
240,854

 
$
(4,779
)
 
$
265,367

 
$
(10,759
)
 
$
506,221

 
$
(15,538
)
 
As of December 31, 2017
 
Less than 12
Months
 
12 Months
or Longer
 
Total
(dollars in thousands)
Fair
Value
 
Unrealized Losses
 
Fair
Value
 
Unrealized Losses
 
Fair
Value
 
Unrealized Losses
Obligations of the U.S. government and agencies
$
114,120

 
$
(1,294
)
 
$
26,726

 
$
(765
)
 
$
140,846

 
$
(2,059
)
Obligations of state and political subdivisions
11,144

 
(29
)
 
2,709

 
(24
)
 
13,853

 
(53
)
Mortgage-backed securities
177,919

 
(1,293
)
 
31,787

 
(562
)
 
209,706

 
(1,855
)
Collateralized mortgage obligations
5,166

 
(47
)
 
26,686

 
(901
)
 
31,852

 
(948
)
Other investment securities
1,805

 
(23
)
 
—

 
—

 
1,805

 
(23
)
Total
$
310,154

 
$
(2,686
)
 
$
87,908

 
$
(2,252
)
 
$
398,062

 
$
(4,938
)
Investments Classified by Contractual Maturity Date
The amortized cost and fair value of held to maturity investment securities as of September 30, 2018 and December 31, 2017, by contractual maturity, are shown below:
 
September 30, 2018
 
December 31, 2017
(dollars in thousands)
Amortized
Cost
 
Fair Value
 
Amortized
Cost
 
Fair Value
Mortgage-backed securities(1)
$
8,916

 
$
8,544

 
$
7,932

 
$
7,851

 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
September 30, 2018
 
December 31, 2017
(dollars in thousands)
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Investment securities:
 
 
 
 
 
 
 
Due in one year or less
$
12,265

 
$
12,237

 
$
211,019

 
$
211,019

Due after one year through five years
176,700

 
171,374

 
126,452

 
124,797

Due after five years through ten years
24,459

 
23,839

 
23,147

 
22,804

Due after ten years
—

 
—

 
15,439

 
15,421

Subtotal
213,424

 
207,450

 
376,057

 
374,041

Mortgage-related securities(1)
329,816

 
320,614

 
313,554

 
311,652

Mutual funds with no stated maturity
—

 
—

 
3,213

 
3,509

Total
$
543,240

 
$
528,064

 
$
692,824

 
$
689,202

 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Summary of Held-to-maturity Debt Securities
The amortized cost and fair value of investment securities held to maturity as of September 30, 2018 and December 31, 2017 are as follows:
 
As of September 30, 2018
(dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
 
Fair Value
Mortgage-backed securities
$
8,916

 
$
—

 
$
(372
)
 
$
8,544

 
As of December 31, 2017
(dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
 
Fair Value
Mortgage-backed securities
$
7,932

 
$
5

 
$
(86
)
 
$
7,851
Summary of Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
The following tables present the aggregate amount of gross unrealized losses as of September 30, 2018 and December 31, 2017 on held to maturity securities classified according to the amount of time those securities have been in a continuous unrealized loss position:
 
As of September 30, 2018
 
Less than 12
Months
 
12 Months
or Longer
 
Total
(dollars in thousands)
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Mortgage-backed securities
$
3,882

 
$
(132
)
 
$
4,662

 
$
(240
)
 
$
8,544

 
$
(372
)
 
As of December 31, 2017
 
Less than 12
Months
 
12 Months
or Longer
 
Total
(dollars in thousands)
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Mortgage-backed securities
$
2,756

 
$
(25
)
 
$
3,866

 
$
(61
)
 
$
6,622

 
$
(86
)