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SECURITIES (Tables)
 6 Months Ended
Jun. 30, 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 securities available-for-sale (“AFS”), as of June 30, 2013 and December 31, 2012: 
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
June 30, 2013
 

 
 

 
 

 
 

Obligations of states and political subdivisions
$
29,079

 
$
1,410

 
$
—

 
$
30,489

Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
347,342

 
6,837

 
(5,401
)
 
348,778

Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
408,826

 
1,271

 
(7,840
)
 
402,257

Private issue collateralized mortgage obligations
8,106

 
12

 
(273
)
 
7,845

Total securities available-for-sale
$
793,353

 
$
9,530

 
$
(13,514
)
 
$
789,369

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 securities available-for-sale
$
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 June 30, 2013 and December 31, 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
June 30, 2013
 

 
 

 
 

 
 

 
 

 
 

Mortgage-backed securities
$
171,566

 
$
(5,401
)
 
$
—

 
$
—

 
$
171,566

 
$
(5,401
)
Collateralized mortgage obligations
298,708

 
(7,840
)
 
—

 
—

 
298,708

 
(7,840
)
Private issue collateralized mortgage obligations
139

 
(5
)
 
5,985

 
(268
)
 
6,124

 
(273
)
Total
$
470,413

 
$
(13,246
)
 
$
5,985

 
$
(268
)
 
$
476,398

 
$
(13,514
)
December 31, 2012
 

 
 

 
 

 
 

 
 

 
 

Mortgage-backed securities
$
42,782

 
$
(79
)
 
$
—

 
$
—

 
$
42,782

 
$
(79
)
Collateralized mortgage obligations
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 tables details the Company’s sales of investment securities, the gross realized gains and losses, and impairment of securities:


 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Available-for-sale
2013
 
2012
 
2013
 
2012
Proceeds from sales of securities
$
—

 
$
18,324

 
$
4,875

 
$
31,364

Gross realized gains
—

 
951

 
138

 
1,104

Gross realized (losses)
—

 
(200
)
 
—

 
(203
)
Other-than-temporary impairment of securities
—

 
—

 
—

 
(29
)
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
Available-for-sale
Amortized
Cost
 
Fair
Value
Due in one year or less
$
1,881

 
$
1,924

Due after one year through five years
25,541

 
26,278

Due after five years through ten years
129,625

 
130,554

Due after ten years
636,306

 
630,613

 
$
793,353

 
$
789,369