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Debt Securities Held-to-Maturity (Tables)
3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Securities Held-to-Maturity
The following is a summary of debt securities held-to-maturity at March 31, 2019, and December 31, 2018 (in thousands): 
 
March 31, 2019
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Mortgage-backed securities:
 

 
 

 
 

 
 

Pass-through certificates:
 

 
 

 
 

 
 

GSEs
$
9,448

 
$

 
$
128

 
$
9,320

Total securities held-to-maturity
$
9,448

 
$

 
$
128

 
$
9,320

 
December 31, 2018
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Mortgage-backed securities:
 

 
 

 
 

 
 

Pass-through certificates:
 

 
 

 
 

 
 

GSEs
$
9,505

 
$

 
$
256

 
$
9,249

Total securities held-to-maturity
$
9,505

 
$

 
$
256

 
$
9,249

Held-to-maturity Securities
Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2019 and December 31, 2018, were as follows (in thousands):
 
March 31, 2019
 
Less than 12 months
 
12 months or more
 
Total
 
Unrealized losses
 
Estimated fair value
 
Unrealized losses
 
Estimated fair value
 
Unrealized losses
 
Estimated fair value
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Pass-through certificates:
 
 
 
 
 
 
 
 
 
 
 
GSEs
$

 
$

 
$
128

 
$
9,320

 
$
128

 
$
9,320

Total securities held-to-maturity
$

 
$

 
$
128

 
$
9,320

 
$
128

 
$
9,320


 
December 31, 2018
 
Less than 12 months
 
12 months or more
 
Total
 
Unrealized losses
 
Estimated fair value
 
Unrealized losses
 
Estimated fair value
 
Unrealized losses
 
Estimated fair value
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Pass-through certificates:
 
 
 
 
 
 
 
 
 
 
 
GSEs
$
34

 
$
2,133

 
$
222

 
$
7,116

 
$
256

 
$
9,249

Total securities held-to-maturity
$
34

 
$
2,133

 
$
222

 
$
7,116

 
$
256

 
$
9,249