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SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2015
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
June 30, 2015
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,967

 
$
84

 
$
—

 
$
5,051

Obligations of states and political subdivisions
21,192

 
481

 
—

 
21,673

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
381,403

 
5,083

 
(3,219
)
 
383,267

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
329,577

 
1,483

 
(4,187
)
 
326,873

Private issue collateralized mortgage obligations
5,495

 
73

 
(76
)
 
5,492

Total AFS securities
$
742,634

 
$
7,204

 
$
(7,482
)
 
$
742,356

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
60,234

 
$
277

 
$
(702
)
 
$
59,809

Total HTM securities
$
60,234

 
$
277

 
$
(702
)
 
$
59,809

December 31, 2014
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,962

 
$
65

 
$
—

 
$
5,027

Obligations of states and political subdivisions
26,080

 
697

 
—

 
26,777

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
377,657

 
5,656

 
(2,005
)
 
381,308

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
348,855

 
953

 
(5,911
)
 
343,897

Private issue collateralized mortgage obligations
5,999

 
63

 
(8
)
 
6,054

Total AFS securities
$
763,553

 
$
7,434

 
$
(7,924
)
 
$
763,063

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
20,179

 
$
265

 
$
(19
)
 
$
20,425

Total HTM securities
$
20,179

 
$
265

 
$
(19
)
 
$
20,425
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, 2015 and December 31, 2014, 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, 2015
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
120,190

 
$
(1,360
)
 
$
58,881

 
$
(1,859
)
 
$
179,071

 
$
(3,219
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
34,272

 
(312
)
 
154,439

 
(3,875
)
 
188,711

 
(4,187
)
Private issue collateralized mortgage obligations
1,704

 
(76
)
 
—

 
—

 
1,704

 
(76
)
Total AFS securities
$
156,166

 
$
(1,748
)
 
$
213,320

 
$
(5,734
)
 
$
369,486

 
$
(7,482
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
40,243

 
$
(702
)
 
$
—

 
$
—

 
$
40,243

 
$
(702
)
Total HTM securities
$
40,243

 
$
(702
)
 
$
—

 
$
—

 
$
40,243

 
$
(702
)
December 31, 2014
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
42,856

 
$
(171
)
 
$
125,439

 
$
(1,834
)
 
$
168,295

 
$
(2,005
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
75,723

 
(432
)
 
182,512

 
(5,479
)
 
258,235

 
(5,911
)
Private issue collateralized mortgage obligations
1,785

 
(8
)
 
—

 
—

 
1,785

 
(8
)
Total AFS securities
$
120,364

 
$
(611
)
 
$
307,951

 
$
(7,313
)
 
$
428,315

 
$
(7,924
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
5,756

 
$
(19
)
 
$
—

 
$
—

 
$
5,756

 
$
(19
)
Total HTM securities
$
5,756

 
$
(19
)
 
$
—

 
$
—

 
$
5,756

 
$
(19
)
Company's Sales of Securities
The following table details the Company’s sales of AFS securities for the period indicated below:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Proceeds from sales of securities
$
—

 
$
16,258

 
$
—

 
$
25,695

Gross realized gains
—

 
285

 
—

 
451

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 June 30, 2015, 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
$
3,131

 
$
3,188

Due after one year through five years
89,497

 
89,995

Due after five years through ten years
103,955

 
105,684

Due after ten years
546,051

 
543,489

 
$
742,634

 
$
742,356

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
2,250

 
2,284

Due after five years through ten years
1,143

 
1,146

Due after ten years
56,841

 
56,379

 
$
60,234

 
$
59,809