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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]  
Securities Available for Sale
The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available for sale at September 30, 2017 and December 31, 2016 (in thousands):
 

September 30, 2017
 

Amortized
cost

Gross
unrealized
gains

Gross
unrealized
losses
 
Fair
value
U.S. Treasury obligations
 
$
5,995

 
—

 
(1
)
 
5,994

Agency obligations

28,031


15


(11
)
 
28,035

Mortgage-backed securities

965,863


7,477


(4,928
)
 
968,412

State and municipal obligations

3,695


112


—

 
3,807

Corporate obligations
 
21,049

 
420

 
(10
)
 
21,459

Equity securities

397


201


—

 
598

 

$
1,025,030


8,225


(4,950
)
 
1,028,305

 
 
December 31, 2016
 
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
U.S. Treasury obligations
 
$
7,995

 
13

 
—

 
8,008

Agency obligations
 
57,123

 
90

 
(25
)
 
57,188

Mortgage-backed securities
 
952,992

 
7,249

 
(8,380
)
 
951,861

State and municipal obligations
 
3,727

 
19

 
(3
)
 
3,743

Corporate obligations
 
19,013

 
35

 
(11
)
 
19,037

Equity securities
 
397

 
152

 
—

 
549

 
 
$
1,041,247

 
7,558

 
(8,419
)
 
1,040,386
Available for sale securities with temporary impairment
The following tables present the fair value and gross unrealized losses for securities available for sale with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands):
 

September 30, 2017 Unrealized Losses
 

Less than 12 months
 
12 months or longer
 
Total
 

Fair 
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
U.S. Treasury obligations
 
$
5,994

 
(1
)
 
—

 
—

 
5,994

 
(1
)
Agency obligations

16,008

 
(11
)
 
—

 
—

 
16,008

 
(11
)
Mortgage-backed securities

424,627

 
(3,956
)
 
50,881

 
(972
)
 
475,508

 
(4,928
)
Corporate obligations
 
—

 
—

 
991

 
(10
)
 
991

 
(10
)


$
446,629

 
(3,968
)
 
51,872

 
(982
)
 
498,501

 
(4,950
)
 

December 31, 2016 Unrealized Losses
 

Less than 12 months
 
12 months or longer
 
Total
 

Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
Agency obligations
 
$
14,000

 
(25
)
 
—

 
—

 
14,000

 
(25
)
Mortgage-backed securities
 
553,629

 
(8,377
)
 
65

 
(3
)
 
553,694

 
(8,380
)
State and municipal obligations
 
661

 
(3
)
 
—

 
—

 
661

 
(3
)
Corporate obligations
 
—

 
—

 
990

 
(11
)
 
990

 
(11
)


$
568,290

 
(8,405
)
 
1,055

 
(14
)
 
569,345

 
(8,419
)
Investment Securities Held to Maturity
The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the estimated fair value for investment securities held to maturity at September 30, 2017 and December 31, 2016 (in thousands):
 
 
September 30, 2017
 
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations

$
4,307

 
—

 
(55
)
 
4,252

Mortgage-backed securities

475

 
17

 
—

 
492

State and municipal obligations

467,113

 
10,407

 
(1,761
)
 
475,759

Corporate obligations

9,950

 
6

 
(34
)
 
9,922

 

$
481,845

 
10,430

 
(1,850
)
 
490,425

 
 
 
 
 
 
 
 
 

 
 
December 31, 2016
 
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
Agency obligations
 
$
4,306

 
2

 
(83
)
 
4,225

Mortgage-backed securities
 
893

 
31

 
—

 
924

State and municipal obligations
 
473,653

 
6,635

 
(5,436
)
 
474,852

Corporate obligations
 
9,331

 
7

 
(52
)
 
9,286

 
 
$
488,183

 
6,675

 
(5,571
)
 
489,287

The following tables present the fair value and gross unrealized losses for investment securities held to maturity with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands):
 
 
September 30, 2017 Unrealized Losses
 
 
Less than 12 months
 
12 months or longer
 
Total
 
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
Agency obligations

$
3,853

 
(55
)
 
—

 
—

 
3,853

 
(55
)
State and municipal obligations

62,881

 
(938
)
 
22,251

 
(823
)
 
85,132

 
(1,761
)
Corporate obligations

6,646

 
(34
)
 
—

 
—

 
6,646

 
(34
)
 

$
73,380

 
(1,027
)
 
22,251

 
(823
)
 
95,631

 
(1,850
)
 
 
December 31, 2016 Unrealized Losses
 
 
Less than 12 months
 
12 months or longer
 
Total
 
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
 
Fair
value
 
Gross
unrealized
losses
Agency obligations
 
$
3,525

 
(83
)
 
—

 
—

 
3,525

 
(83
)
State and municipal obligations
 
172,152

 
(5,132
)
 
6,617

 
(304
)
 
178,769

 
(5,436
)
Corporate obligations
 
4,697

 
(52
)
 
—

 
—

 
4,697

 
(52
)
 
 
$
180,374

 
(5,267
)
 
6,617

 
(304
)
 
186,991

 
(5,571
)
Available-for-sale Securities [Member]  
Fair Value, Option, Quantitative Disclosures [Line Items]  
Investment Securities Classified by Contractual Maturity
The amortized cost and fair value of securities available for sale at September 30, 2017, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
 
September 30, 2017
 
 
Amortized
cost
 
Fair
value
Due in one year or less
 
$
35,452

 
35,445

Due after one year through five years
 
2,423

 
2,471

Due after five years through ten years
 
20,895

 
21,379

Due after ten years
 
—

 
—

 
 
$
58,770

 
59,295
Held-to-maturity Securities [Member]  
Fair Value, Option, Quantitative Disclosures [Line Items]  
Investment Securities Classified by Contractual Maturity
The amortized cost and fair value of investment securities in the held to maturity portfolio at September 30, 2017 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
 
September 30, 2017
 
 
Amortized
cost
 
Fair
value
Due in one year or less

$
14,723

 
14,755

Due after one year through five years

65,170

 
66,276

Due after five years through ten years

254,191

 
259,908

Due after ten years

147,286

 
148,994



$
481,370

 
489,933