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Securities (Tables)
 12 Months Ended
Dec. 31, 2016
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, 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

December 31, 2015:
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,971

 
$
69

 
$
—

 
$
5,040

Obligations of states and political subdivisions
17,355

 
339

 
—

 
17,694

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
419,429

 
3,474

 
(3,857
)
 
419,046

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
312,719

 
409

 
(6,271
)
 
306,857

Subordinated corporate bonds
1,000

 
—

 
(4
)
 
996

Total AFS debt securities
755,474

 
4,291

 
(10,132
)
 
749,633

Equity securities
712

 
2

 
(9
)
 
705

Total AFS securities
$
756,186

 
$
4,293

 
$
(10,141
)
 
$
750,338

HTM Securities:


 


 


 


Obligations of states and political subdivisions
$
84,144

 
$
1,564

 
$
(61
)
 
$
85,647

Total HTM securities
$
84,144

 
$
1,564

 
$
(61
)
 
$
85,647
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, 2016 and 2015, 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, 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
)
December 31, 2015:
  

 
  

 
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
234,897

 
$
(2,351
)
 
$
45,629

 
$
(1,506
)
 
$
280,526

 
$
(3,857
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
111,143

 
(1,068
)
 
147,180

 
(5,203
)
 
258,323

 
(6,271
)
Subordinated corporate bonds
996

 
(4
)
 
—

 
—

 
996

 
(4
)
Equity securities
615

 
(9
)
 
—

 
—

 
615

 
(9
)
Total AFS securities
$
347,651

 
$
(3,432
)
 
$
192,809

 
$
(6,709
)
 
$
540,460

 
$
(10,141
)
HTM Securities:


 


 


 


 


 


Obligations of states and political subdivisions
$
5,507

 
$
(61
)
 
$
—

 
$
—

 
$
5,507

 
$
(61
)
Total HTM securities
$
5,507

 
$
(61
)
 
$
—

 
$
—

 
$
5,507

 
$
(61
)
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,
  
2016
 
2015
 
2014
Proceeds from sales of securities
$
28,850

 
$
12,426

 
$
25,695

Gross realized gains
125

 
221

 
451

Gross realized losses
(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, 2016 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
$
1,034

 
$
1,039

Due after one year through five years
86,362

 
86,299

Due after five years through ten years
129,521

 
129,248

Due after ten years
571,680

 
562,540

  
$
788,597

 
$
779,126

HTM Securities
 
 
 
Due after one year through five years
$
5,599

 
$
5,650

Due after five years through ten years
4,210

 
4,221

Due after ten years
84,800

 
84,725

 
$
94,609

 
$
94,596