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Securities (Tables)
 12 Months Ended
Dec. 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 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, 2015:
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises
$
4,971

 
$
69

 
$
—

 
$
5,040

Obligations of states and political subdivisions
17,355

 
339

 
—

 
17,694

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
419,429

 
3,474

 
(3,857
)
 
419,046

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
312,719

 
409

 
(6,271
)
 
306,857

Subordinated corporate bonds
1,000

 
—

 
(4
)
 
996

Total AFS debt securities
755,474

 
4,291

 
(10,132
)
 
749,633

Equity securities
712

 
2

 
(9
)
 
705

Total AFS securities
$
756,186

 
$
4,293

 
$
(10,141
)
 
$
750,338

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
84,144

 
$
1,564

 
$
(61
)
 
$
85,647

Total HTM securities
$
84,144

 
$
1,564

 
$
(61
)
 
$
85,647

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 December 31, 2015 and 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
December 31, 2015:
  

 
  

 
  

 
  

 
  

 
  

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
234,897

 
$
(2,351
)
 
$
45,629

 
$
(1,506
)
 
$
280,526

 
$
(3,857
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
111,143

 
(1,068
)
 
147,180

 
(5,203
)
 
258,323

 
(6,271
)
Subordinated corporate bonds
996

 
(4
)
 
—

 
—

 
996

 
(4
)
Equity securities
615

 
(9
)
 
—

 
—

 
615

 
(9
)
Total AFS securities
$
347,651

 
$
(3,432
)
 
$
192,809

 
$
(6,709
)
 
$
540,460

 
$
(10,141
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
5,507

 
$
(61
)
 
$
—

 
$
—

 
$
5,507

 
$
(61
)
Total HTM securities
$
5,507

 
$
(61
)
 
$
—

 
$
—

 
$
5,507

 
$
(61
)
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 investment securities, the gross realized gains and losses, and OTTI of securities:
 
For The Years Ended
December 31,
  
2015
 
2014
 
2013
Proceeds from sales of securities
$
12,426

 
$
25,695

 
$
17,613

Gross realized gains
221

 
451

 
785

Gross realized losses
(217
)
 
—

 
—

Previously recorded OTTI
204

 
—

 
—
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, 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
$
2,787

 
$
2,813

Due after one year through five years
87,743

 
87,722

Due after five years through ten years
114,988

 
115,359

Due after ten years
549,956

 
543,739

  
$
755,474

 
$
749,633

HTM Securities
 
 
 
Due in one year or less
$
—

 
$
—

Due after one year through five years
2,219

 
2,269

Due after five years through ten years
1,125

 
1,135

Due after ten years
80,800

 
82,243

 
$
84,144

 
$
85,647