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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: 
 
December 31, 2016
(in thousands)
Amortized Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair Value
Available for sale securities:
 
 
 
 
 
 
 
    Obligations of U.S. Government-sponsored enterprises
$
107,312

 
$
348

 
$
—

 
$
107,660

    Obligations of states and political subdivisions
36,486

 
630

 
(485
)
 
36,631

    Agency mortgage-backed securities
319,345

 
1,101

 
(3,940
)
 
316,506

          Total securities available for sale
$
463,143

 
$
2,079

 
$
(4,425
)
 
$
460,797

 
 
 
 
 
 
 
 
Held to maturity securities:
 
 
 
 
 
 
 
    Obligations of states and political subdivisions
$
14,759

 
$
11

 
$
(242
)
 
$
14,528

    Agency mortgage-backed securities
65,704

 
45

 
(638
)
 
65,111

          Total securities held to maturity
$
80,463

 
$
56

 
$
(880
)
 
$
79,639

 
 
 
 
 
 
 
 
 
December 31, 2015
(in thousands)
Amortized Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair Value
Available for sale securities:
 
 
 
 
 
 
 
    Obligations of U.S. Government-sponsored enterprises
$
98,699

 
$
309

 
$
—

 
$
99,008

    Obligations of states and political subdivisions
40,700

 
1,343

 
(342
)
 
41,701

    Agency mortgage-backed securities
311,516

 
2,046

 
(2,501
)
 
311,061

Total securities available for sale
$
450,915

 
$
3,698

 
$
(2,843
)
 
$
451,770

 
 
 
 
 
 
 
 
Held to maturity securities:
 
 
 
 
 
 
 
    Obligations of states and political subdivisions
$
14,831

 
$
63

 
$
(50
)
 
$
14,844

    Agency mortgage-backed securities
28,883

 
—

 
(286
)
 
28,597

Total securities held to maturity
$
43,714

 
$
63

 
$
(336
)
 
$
43,441
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: 
 
December 31, 2016
(in thousands)
Amortized Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair Value
Available for sale securities:
 
 
 
 
 
 
 
    Obligations of U.S. Government-sponsored enterprises
$
107,312

 
$
348

 
$
—

 
$
107,660

    Obligations of states and political subdivisions
36,486

 
630

 
(485
)
 
36,631

    Agency mortgage-backed securities
319,345

 
1,101

 
(3,940
)
 
316,506

          Total securities available for sale
$
463,143

 
$
2,079

 
$
(4,425
)
 
$
460,797

 
 
 
 
 
 
 
 
Held to maturity securities:
 
 
 
 
 
 
 
    Obligations of states and political subdivisions
$
14,759

 
$
11

 
$
(242
)
 
$
14,528

    Agency mortgage-backed securities
65,704

 
45

 
(638
)
 
65,111

          Total securities held to maturity
$
80,463

 
$
56

 
$
(880
)
 
$
79,639

 
 
 
 
 
 
 
 
 
December 31, 2015
(in thousands)
Amortized Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair Value
Available for sale securities:
 
 
 
 
 
 
 
    Obligations of U.S. Government-sponsored enterprises
$
98,699

 
$
309

 
$
—

 
$
99,008

    Obligations of states and political subdivisions
40,700

 
1,343

 
(342
)
 
41,701

    Agency mortgage-backed securities
311,516

 
2,046

 
(2,501
)
 
311,061

Total securities available for sale
$
450,915

 
$
3,698

 
$
(2,843
)
 
$
451,770

 
 
 
 
 
 
 
 
Held to maturity securities:
 
 
 
 
 
 
 
    Obligations of states and political subdivisions
$
14,831

 
$
63

 
$
(50
)
 
$
14,844

    Agency mortgage-backed securities
28,883

 
—

 
(286
)
 
28,597

Total securities held to maturity
$
43,714

 
$
63

 
$
(336
)
 
$
43,441
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at December 31, 2016, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 4 years. 
 
Available for sale
 
Held to maturity
(in thousands)
Amortized Cost
 
Estimated
Fair Value
 
Amortized Cost
 
Estimated
Fair Value
Due in one year or less
$
52,457

 
$
52,574

 
$
658

 
$
655

Due after one year through five years
76,529

 
77,254

 
5,609

 
5,559

Due after five years through ten years
11,912

 
11,842

 
7,380

 
7,241

Due after ten years
2,900

 
2,620

 
1,112

 
1,073

Mortgage-backed securities
319,345

 
316,507

 
65,704

 
65,111

 
$
463,143

 
$
460,797

 
$
80,463

 
$
79,639
Schedule of Unrealized Loss on Investments
The following table represents a summary of investment securities that had an unrealized loss:
 
 
December 31, 2016
Less than 12 months
 
12 months or more
 
Total
(in thousands)
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Obligations of states and political subdivisions
21,361

 
408

 
3,553

 
320

 
24,914

 
728

Agency mortgage-backed securities
267,734

 
4,084

 
12,883

 
493

 
280,617

 
4,577

 
$
289,095

 
$
4,492

 
$
16,436

 
$
813

 
$
305,531

 
$
5,305

 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
Less than 12 months
 
12 months or more
 
Total
(in thousands)
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
Obligations of states and political subdivisions
2,199

 
12

 
9,395

 
380

 
11,594

 
392

Agency mortgage-backed securities
189,229

 
2,050

 
21,020

 
737

 
210,249

 
2,787

 
$
191,428

 
$
2,062

 
$
30,415

 
$
1,117

 
$
221,843

 
$
3,179
Schedule of Realized Gain (Loss)
The gross gains and losses realized from sales of available for sale investment securities were as follows:
 
 
December 31,
(in thousands)
2016
 
2015
 
2014
Gross gains realized
$
86

 
$
63

 
$
—

Gross losses realized
—

 
(40
)
 
—

Proceeds from sales
2,493

 
41,069

 
—