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SECURITIES (Tables)
 9 Months Ended
Sep. 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
September 30, 2015
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,969

 
$
125

 
$
—

 
$
5,094

Obligations of states and political subdivisions
19,471

 
401

 
—

 
19,872

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
376,950

 
5,490

 
(1,391
)
 
381,049

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
318,417

 
2,512

 
(2,707
)
 
318,222

Total AFS securities
$
719,807

 
$
8,528

 
$
(4,098
)
 
$
724,237

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
75,368

 
$
1,311

 
$
(101
)
 
$
76,578

Total HTM securities
$
75,368

 
$
1,311

 
$
(101
)
 
$
76,578

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 September 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
September 30, 2015
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
53,164

 
$
(395
)
 
$
57,721

 
$
(996
)
 
$
110,885

 
$
(1,391
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
12,183

 
(188
)
 
145,289

 
(2,519
)
 
157,472

 
(2,707
)
Total AFS securities
$
65,347

 
$
(583
)
 
$
203,010

 
$
(3,515
)
 
$
268,357

 
$
(4,098
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
12,388

 
$
(101
)
 
$
—

 
$
—

 
$
12,388

 
$
(101
)
Total HTM securities
$
12,388

 
$
(101
)
 
$
—

 
$
—

 
$
12,388

 
$
(101
)
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 September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Proceeds from sales of securities
$
12,426

 
$
—

 
$
12,426

 
$
25,695

Gross realized gains
221

 
—

 
221

 
451

Gross realized losses
(217
)
 
—

 
(217
)
 
—
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, 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
$
3,594

 
$
3,634

Due after one year through five years
87,212

 
88,411

Due after five years through ten years
110,852

 
113,415

Due after ten years
518,149

 
518,777

 
$
719,807

 
$
724,237

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
2,234

 
2,290

Due after five years through ten years
1,134

 
1,143

Due after ten years
72,000

 
73,145

 
$
75,368

 
$
76,578