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Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities
The following tables summarize the amortized costs and estimated fair values of AFS and HTM securities, as of the dates indicated:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair
Value
December 31, 2017:
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
7,232

 
$
103

 
$
—

 
$
7,335

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
510,176

 
597

 
(7,471
)
 
503,302

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
279,575

 
14

 
(6,790
)
 
272,799

Subordinated corporate bonds
5,484

 
173

 
—

 
5,657

Total AFS debt securities
802,467

 
887

 
(14,261
)
 
789,093

Equity securities
554

 
252

 
—

 
806

Total AFS securities
$
803,021

 
$
1,139

 
$
(14,261
)
 
$
789,899

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,073

 
$
1,077

 
$
(237
)
 
$
94,913

Total HTM securities
$
94,073

 
$
1,077

 
$
(237
)
 
$
94,913

December 31, 2016:
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
8,848

 
$
153

 
$
—

 
$
9,001

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
485,222

 
2,515

 
(7,115
)
 
480,622

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
289,046

 
265

 
(5,421
)
 
283,890

Subordinated corporate bonds
5,481

 
132

 
—

 
5,613

Total AFS debt securities
788,597

 
3,065

 
(12,536
)
 
779,126

Equity securities
632

 
109

 
—

 
741

Total AFS securities
$
789,229

 
$
3,174

 
$
(12,536
)
 
$
779,867

HTM Securities:


 


 


 


Obligations of states and political subdivisions
$
94,609

 
$
618

 
$
(631
)
 
$
94,596

Total HTM securities
$
94,609

 
$
618

 
$
(631
)
 
$
94,596
Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position
The following table presents the estimated fair values and gross unrealized losses of investment securities that were in a continuous loss position at December 31, 2017 and 2016, by length of time that individual securities in each category have been in a continuous loss position:
 
Less Than 12 Months
 
12 Months or More
 
Total
  
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
December 31, 2017:
  

 
  

 
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
221,466

 
$
(2,393
)
 
$
233,971

 
$
(5,078
)
 
$
455,437

 
$
(7,471
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
102,612

 
(696
)
 
164,389

 
(6,094
)
 
267,001

 
(6,790
)
Total AFS securities
$
324,078

 
$
(3,089
)
 
$
398,360

 
$
(11,172
)
 
$
722,438

 
$
(14,261
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
9,317

 
$
(57
)
 
$
9,436

 
$
(180
)
 
$
18,753

 
$
(237
)
Total HTM securities
$
9,317

 
$
(57
)
 
$
9,436

 
$
(180
)
 
$
18,753

 
$
(237
)
December 31, 2016:
  

 
  

 
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
348,579

 
$
(5,780
)
 
$
29,496

 
$
(1,335
)
 
$
378,075

 
$
(7,115
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
163,412

 
(2,906
)
 
74,212

 
(2,515
)
 
237,624

 
(5,421
)
Total AFS securities
$
511,991

 
$
(8,686
)
 
$
103,708

 
$
(3,850
)
 
$
615,699

 
$
(12,536
)
HTM Securities:


 


 


 


 


 


Obligations of states and political subdivisions
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)
Total HTM securities
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)
Company's Sales of Securities
The following table details the Company’s sales of AFS investment securities, the gross realized gains and losses, and OTTI of securities:
 
For The Year Ended
December 31,
  
2017
 
2016
 
2015
Proceeds from sales of securities
$
20,366

 
$
28,850

 
$
12,426

Gross realized gains
869

 
125

 
221

Gross realized losses
(14
)
 
(74
)
 
(217
)
Previously recorded OTTI
—

 
—

 
204
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The amortized cost and estimated fair values of securities by contractual maturity at December 31, 2017 are shown below. 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.
 
Amortized Cost
 
Fair
Value
AFS Securities
 
 
 
Due in one year or less
$
4,986

 
$
4,983

Due after one year through five years
104,294

 
103,572

Due after five years through ten years
212,809

 
209,663

Due after ten years
480,378

 
470,875

  
$
802,467

 
$
789,093

HTM Securities
 
 
 
Due in one year or less
$
751

 
$
751

Due after one year through five years
4,705

 
4,721

Due after five years through ten years
10,110

 
10,192

Due after ten years
78,507

 
79,249

 
$
94,073

 
$
94,913