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SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2015
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,964

 
$
121

 
$
—

 
$
5,085

Obligations of states and political subdivisions
22,574

 
593

 
—

 
23,167

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
378,675

 
6,977

 
(930
)
 
384,722

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
334,364

 
2,150

 
(3,133
)
 
333,381

Private issue collateralized mortgage obligations
5,757

 
85

 
(33
)
 
5,809

Total AFS securities
$
746,334

 
$
9,926

 
$
(4,096
)
 
$
752,164

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
41,010

 
$
529

 
$
(40
)
 
$
41,499

Total HTM securities
$
41,010

 
$
529

 
$
(40
)
 
$
41,499

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 March 31, 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
March 31, 2015
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
10,308

 
$
(26
)
 
$
73,476

 
$
(904
)
 
$
83,784

 
$
(930
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
9,308

 
(171
)
 
161,546

 
(2,962
)
 
170,854

 
(3,133
)
Private issue collateralized mortgage obligations
1,818

 
(33
)
 
—

 
—

 
1,818

 
(33
)
Total AFS securities
$
21,434

 
$
(230
)
 
$
235,022

 
$
(3,866
)
 
$
256,456

 
$
(4,096
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
6,160

 
$
(40
)
 
$
—

 
$
—

 
$
6,160

 
$
(40
)
Total HTM securities
$
6,160

 
$
(40
)
 
$
—

 
$
—

 
$
6,160

 
$
(40
)
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 March 31,
 
2015
 
2014
Proceeds from sales of securities
$
—

 
$
9,437

Gross realized gains
—

 
166

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 March 31, 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
$
2,535

 
$
2,588

Due after one year through five years
89,461

 
90,309

Due after five years through ten years
96,423

 
98,530

Due after ten years
557,915

 
560,737

 
$
746,334

 
$
752,164

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
1,118

 
1,159

Due after five years through ten years
2,299

 
2,316

Due after ten years
37,593

 
38,024

 
$
41,010

 
$
41,499