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SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2014
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 cost and estimated fair values of AFS and HTM securities, as of the dates indicated: 
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
September 30, 2014
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,960

 
$
22

 
$
—

 
$
4,982

Obligations of states and political subdivisions
27,240

 
806

 
—

 
28,046

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
377,375

 
5,108

 
(4,279
)
 
378,204

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
360,830

 
867

 
(7,384
)
 
354,313

Private issue collateralized mortgage obligations
6,249

 
76

 
(64
)
 
6,261

Total AFS securities
$
776,654

 
$
6,879

 
$
(11,727
)
 
$
771,806

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
11,490

 
$
210

 
$
(41
)
 
$
11,659

Total HTM securities
$
11,490

 
$
210

 
$
(41
)
 
$
11,659

December 31, 2013
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
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 AFS securities
$
820,728

 
$
7,525

 
$
(19,776
)
 
$
808,477
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 September 30, 2014 and December 31, 2013, 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
September 30, 2014
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
61,223

 
$
(460
)
 
$
127,219

 
$
(3,819
)
 
$
188,442

 
$
(4,279
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
80,475

 
(393
)
 
195,373

 
(6,991
)
 
275,848

 
(7,384
)
Private issue collateralized mortgage obligations
4,719

 
(64
)
 
—

 
—

 
4,719

 
(64
)
Total AFS securities
$
146,417

 
$
(917
)
 
$
322,592

 
$
(10,810
)
 
$
469,009

 
$
(11,727
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
3,401

 
$
(41
)
 
$
—

 
$
—

 
$
3,401

 
$
(41
)
Total HTM securities
$
3,401

 
$
(41
)
 
$
—

 
$
—

 
$
3,401

 
$
(41
)
December 31, 2013
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
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 AFS securities
$
386,967

 
$
(11,942
)
 
$
122,236

 
$
(7,834
)
 
$
509,203

 
$
(19,776
)
Company's Sales of Securities
The following table details the Company’s sales of AFS securities for the period indicated below:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Proceeds from sales of securities
$
—

 
$
12,738

 
$
25,695

 
$
17,613

Gross realized gains
—

 
647

 
451

 
785

Gross realized losses
—

 
—

 
—

 
—
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The amortized cost and estimated fair values of debt securities by contractual maturity at September 30, 2014, 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
$
2,186

 
$
2,209

Due after one year through five years
82,230

 
82,383

Due after five years through ten years
112,277

 
113,046

Due after ten years
579,961

 
574,168

 
$
776,654

 
$
771,806

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
—

 
—

Due after five years through ten years
2,334

 
2,358

Due after ten years
9,156

 
9,301

 
$
11,490

 
$
11,659