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Securities (Tables)
 12 Months Ended
Dec. 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 costs and estimated fair values of AFS and HTM securities, as of the dates indicated:
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair
Value
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

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 December 31, 2014 and 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
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
)
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 investment securities, the gross realized gains and losses, and OTTI of securities:
 
For The Years Ended
December 31,
  
2014
 
2013
 
2012
Proceeds from sales of securities
$
25,695

 
$
17,613

 
$
115,493

Gross realized gains
451

 
785

 
2,826

Gross realized losses
—

 
—

 
(289
)
OTTI
—

 
—

 
(39
)
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The amortized cost and estimated fair values of securities by contractual maturity at December 31, 2014 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
$
2,381

 
$
2,416

Due after one year through five years
97,183

 
97,441

Due after five years through ten years
96,658

 
98,023

Due after ten years
567,331

 
565,183

  
$
763,553

 
$
763,063

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
—

 
—

Due after five years through ten years
2,316

 
2,330

Due after ten years
17,863

 
18,095

 
$
20,179

 
$
20,425