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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Activity in Accumulated Other Comprehensive Income
Activity in accumulated other comprehensive income for the year ended December 31, 2017, 2016 and 2015 was as follows:
 
Unrealized Gains
and Losses on
Available-for-Sale
Securities
 
Unrealized Gains
and Losses on
Interest-Only
Strip
 
Tax Benefit
(Expense)
 
Total
 
 
 
(In thousands)
 
 
For the year ended December 31, 2017
 
 
 
 
 
 
 
Balance at beginning of period
$
(4,089
)
 
$
—

 
$
1,695

 
$
(2,394
)
Other comprehensive loss before reclassification
2,649

 
—

 
(376
)
 
$
2,273

Reclassification from accumulated other comprehensive loss
(1,748
)
 
—

 
—

 
$
(1,748
)
Period change
901

 
—

 
(376
)
 
$
525

Balance at end of period
$
(3,188
)

$
—


$
1,319


$
(1,869
)
 
 
 
 
 
 
 
 
For the year ended December 31, 2016
 
 
 
 
 
 
 
Balance at beginning of period
$
(2,331
)
 
$
9

 
$
2,007

 
$
(315
)
Other comprehensive loss before reclassification
(1,712
)
 
(9
)
 
(312
)
 
$
(2,033
)
Reclassification from accumulated other comprehensive income
(46
)
 
—

 
—

 
$
(46
)
Period change
(1,758
)
 
(9
)
 
(312
)
 
(2,079
)
Balance at end of period
$
(4,089
)

$
—


$
1,695


$
(2,394
)
 
 
 
 
 
 
 
 
For the year ended December 31, 2015
 
 
 
 
 
 
 
Balance at beginning of period
$
(985
)
 
$
16

 
$
1,432

 
$
463

Other comprehensive (loss) income before reclassification
5,265

 
(7
)
 
575

 
$
5,833

Reclassification from accumulated other comprehensive loss
(6,611
)
 


 
—

 
$
(6,611
)
Period change
(1,346
)
 
(7
)
 
575

 
(778
)
Balance at end of period
$
(2,331
)

$
9


$
2,007


$
(315
)