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Securities (Tables)
 12 Months Ended
Dec. 31, 2013
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 securities, as of the dates indicated:

 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair
Value
December 31, 2013:
  

 
  

 
  

 
  

Obligations of states and political subdivisions
$
30,143

 
$
1,075

 
$
(11
)
 
$
31,207

Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
397,409

 
5,528

 
(7,034
)
 
395,903

Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
385,847

 
912

 
(12,324
)
 
374,435

Private issue collateralized mortgage obligations
7,329

 
10

 
(407
)
 
6,932

Total available-for-sale securities
$
820,728

 
$
7,525

 
$
(19,776
)
 
$
808,477

December 31, 2012:
  

 
  

 
  

 
 

Obligations of states and political subdivisions
$
31,112

 
$
1,928

 
$
—

 
$
33,040

Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
345,528

 
12,699

 
(79
)
 
358,148

Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
375,627

 
6,181

 
(120
)
 
381,688

Private issue collateralized mortgage obligations
8,871

 
—

 
(697
)
 
8,174

Total available-for-sale securities
$
761,138

 
$
20,808

 
$
(896
)
 
$
781,050
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, 2013 and 2012, 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, 2013:
  

 
  

 
  

 
  

 
  

 
  

Obligations of states and political subdivisions
$
2,143

 
$
(11
)
 
$
—

 
$
—

 
$
2,143

 
$
(11
)
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
145,424

 
(4,189
)
 
43,915

 
(2,845
)
 
189,339

 
(7,034
)
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
239,278

 
(7,738
)
 
73,376

 
(4,586
)
 
312,654

 
(12,324
)
Private issue collateralized mortgage obligations
122

 
(4
)
 
4,945

 
(403
)
 
5,067

 
(407
)
Total
$
386,967

 
$
(11,942
)
 
$
122,236

 
$
(7,834
)
 
$
509,203

 
$
(19,776
)
December 31, 2012:
  

 
  

 
  

 
  

 
  

 
  

Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
$
42,782

 
$
(79
)
 
$
—

 
$
—

 
$
42,782

 
$
(79
)
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
73,098

 
(120
)
 
—

 
—

 
73,098

 
(120
)
Private issue collateralized mortgage obligations
—

 
—

 
8,174

 
(697
)
 
8,174

 
(697
)
Total
$
115,880

 
$
(199
)
 
$
8,174

 
$
(697
)
 
$
124,054

 
$
(896
)
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:

 
Years Ended December 31,
  
2013
 
2012
 
2011
Proceeds from sales of securities
$
17,613

 
$
115,493

 
$
54,600

Gross realized gains
785

 
2,826

 
2,258

Gross realized losses
—

 
(289
)
 
(73
)
OTTI
—

 
(39
)
 
(109
)
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The amortized cost and estimated fair values of AFS debt securities by contractual maturity at December 31, 2013 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
Due in one year or less
$
1,654

 
$
1,667

Due after one year through five years
29,753

 
30,433

Due after five years through ten years
155,014

 
155,315

Due after ten years
634,307

 
621,062

  
$
820,728

 
$
808,477