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SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2017
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
8,156

 
$
130

 
$
—

 
$
8,286

Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
526,135

 
2,392

 
(7,030
)
 
521,497

Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
292,901

 
172

 
(6,064
)
 
287,009

Subordinated corporate bonds
5,483

 
190

 
—

 
5,673

Total AFS debt securities
832,675

 
2,884

 
(13,094
)
 
822,465

Equity securities
632

 
144

 
—

 
776

Total AFS securities
$
833,307

 
$
3,028

 
$
(13,094
)
 
$
823,241

HTM Securities:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
94,474

 
$
583

 
$
(713
)
 
$
94,344

Total HTM securities
$
94,474

 
$
583

 
$
(713
)
 
$
94,344

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 March 31, 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
March 31, 2017
 

 
 

 
 

 
 

 
 

 
 

AFS Securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
$
393,109

 
$
(5,745
)
 
$
28,177

 
$
(1,285
)
 
$
421,286

 
$
(7,030
)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
193,320

 
(3,114
)
 
70,552

 
(2,950
)
 
263,872

 
(6,064
)
Total AFS securities
$
586,429

 
$
(8,859
)
 
$
98,729

 
$
(4,235
)
 
$
685,158

 
$
(13,094
)
HTM Securities:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
45,174

 
$
(713
)
 
$
—

 
$
—

 
$
45,174

 
$
(713
)
Total HTM securities
$
45,174

 
$
(713
)
 
$
—

 
$
—

 
$
45,174

 
$
(713
)
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
)
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, 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
$
1,585

 
$
1,587

Due after one year through five years
88,748

 
88,607

Due after five years through ten years
170,189

 
169,920

Due after ten years
572,153

 
562,351

 
$
832,675

 
$
822,465

HTM Securities
 
 
 
Due in one year or less
$
762

 
$
768

Due after one year through five years
4,801

 
4,870

Due after five years through ten years
4,561

 
4,622

Due after ten years
84,350

 
84,084

 
$
94,474

 
$
94,344