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SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
7,235

 
$
157

 
$
—

 
$
7,392

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
524,635

 
2,280

 
(5,239
)
 
521,676

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
279,588

 
268

 
(4,984
)
 
274,872

Subordinated corporate bonds
5,483

 
193

 
—

 
5,676

Total AFS debt securities
816,941

 
2,898

 
(10,223
)
 
809,616

Equity securities
632

 
610

 
—

 
1,242

Total AFS securities
$
817,573

 
$
3,508

 
$
(10,223
)
 
$
810,858

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,340

 
$
1,037

 
$
(369
)
 
$
95,008

Total HTM securities
$
94,340

 
$
1,037

 
$
(369
)
 
$
95,008

December 31, 2016
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
8,848

 
$
153

 
$
—

 
$
9,001

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
485,222

 
2,515

 
(7,115
)
 
480,622

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
289,046

 
265

 
(5,421
)
 
283,890

Subordinated corporate bonds
5,481

 
132

 
—

 
5,613

Total AFS debt securities
788,597

 
3,065

 
(12,536
)
 
779,126

Equity securities
632

 
109

 
—

 
741

Total AFS securities
$
789,229

 
$
3,174

 
$
(12,536
)
 
$
779,867

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,609

 
$
618

 
$
(631
)
 
$
94,596

Total HTM securities
$
94,609

 
$
618

 
$
(631
)
 
$
94,596
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, 2017 and December 31, 2016, 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, 2017
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
364,378

 
$
(4,139
)
 
$
29,988

 
$
(1,100
)
 
$
394,366

 
$
(5,239
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
116,495

 
(1,561
)
 
91,652

 
(3,423
)
 
208,147

 
(4,984
)
Total AFS securities
$
480,873

 
$
(5,700
)
 
$
121,640

 
$
(4,523
)
 
$
602,513

 
$
(10,223
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
20,686

 
$
(369
)
 
$
—

 
$
—

 
$
20,686

 
$
(369
)
Total HTM securities
$
20,686

 
$
(369
)
 
$
—

 
$
—

 
$
20,686

 
$
(369
)
December 31, 2016
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
348,579

 
$
(5,780
)
 
$
29,496

 
$
(1,335
)
 
$
378,075

 
$
(7,115
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
163,412

 
(2,906
)
 
74,212

 
(2,515
)
 
237,624

 
(5,421
)
Total AFS securities
$
511,991

 
$
(8,686
)
 
$
103,708

 
$
(3,850
)
 
$
615,699

 
$
(12,536
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)
Total HTM securities
$
42,805

 
$
(631
)
 
$
—

 
$
—

 
$
42,805

 
$
(631
)
Gain (Loss) on Investments

Sale 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,
 
 
2017
 
2016
 
2017
 
2016
Proceeds from sales of securities
 
$
—

 
$
84

 
$
—

 
$
84

Gross realized gains
 
—

 
4

 
—

 
4

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, 2017, 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
$
1,631

 
$
1,639

Due after one year through five years
103,620

 
103,833

Due after five years through ten years
162,740

 
162,857

Due after ten years
548,950

 
541,287

 
$
816,941

 
$
809,616

HTM Securities
 
 
 
Due in one year or less
$
758

 
$
762

Due after one year through five years
4,769

 
4,835

Due after five years through ten years
5,043

 
5,140

Due after ten years
83,770

 
84,271

 
$
94,340

 
$
95,008