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SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2014
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,956

 
$
6

 
$
—

 
$
4,962

Obligations of states and political subdivisions
28,681

 
995

 
(2
)
 
29,674

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
394,010

 
5,793

 
(5,040
)
 
394,763

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
372,200

 
752

 
(11,613
)
 
361,339

Private issue collateralized mortgage obligations
6,838

 
40

 
(374
)
 
6,504

Total AFS securities
$
806,685

 
$
7,586

 
$
(17,029
)
 
$
797,242

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
6,973

 
$
29

 
$
(35
)
 
$
6,967

Total HTM securities
$
6,973

 
$
29

 
$
(35
)
 
$
6,967

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 March 31, 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
March 31, 2014
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
631

 
$
(2
)
 
$
—

 
$
—

 
$
631

 
$
(2
)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
131,887

 
(2,760
)
 
43,244

 
(2,280
)
 
175,131

 
(5,040
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
202,801

 
(5,901
)
 
98,773

 
(5,712
)
 
301,574

 
(11,613
)
Private issue collateralized mortgage obligations
467

 
(1
)
 
4,566

 
(373
)
 
5,033

 
(374
)
Total AFS securities
$
335,786

 
$
(8,664
)
 
$
146,583

 
$
(8,365
)
 
$
482,369

 
$
(17,029
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
3,183

 
$
(35
)
 
$
—

 
$
—

 
$
3,183

 
$
(35
)
Total HTM securities
$
3,183

 
$
(35
)
 
$
—

 
$
—

 
$
3,183

 
$
(35
)
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
March 31,
 
2014
 
2013
Proceeds from sales of securities
$
9,437

 
$
4,875

Gross realized gains
166

 
138

Gross realized losses
—

 
—
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
 
Amortized
Cost
 
Fair
Value
AFS Securities
 
 
 
Due in one year or less
$
875

 
$
891

Due after one year through five years
30,121

 
30,671

Due after five years through ten years
159,389

 
160,327

Due after ten years
616,300

 
605,353

 
$
806,685

 
$
797,242

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
—

 
—

Due after five years through ten years
1,188

 
1,177

Due after ten years
5,785

 
5,790

 
$
6,973

 
$
6,967