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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income
Changes in AOCI for the periods indicated are summarized as follows:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
 
 
Before
Tax
 
Tax
Effect
 
Net
of Tax
 
Before
Tax
 
Tax
Effect
 
Net
of Tax
 
 
(Dollars in thousands)
Unrealized gains (losses) on debt securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
Balance at beginning of period
 
$
14,402

 
$
(5,509
)
 
$
8,893

 
$
(6,504
)
 
$
2,509

 
$
(3,995
)
Net unrealized holding gain (loss) arising during the period
 
(19,242
)
 
4,801

 
(14,441
)
 
17,505

 
(6,719
)
 
10,786

Amounts reclassified to (gain) loss on investment securities, net
 
(405
)
 
101

 
(304
)
 
(82
)
 
32

 
(50
)
Cumulative adjustment from adoption of new accounting standards
 
(1,587
)
 
2,312

 
725

 
—

 
—

 
—

Balance at end of period
 
(6,832
)
 
1,705

 
(5,127
)
 
10,919

 
(4,178
)
 
6,741

Unrealized gains (losses) on derivative instruments:
 
 
 
 
 
 
 
 
 
 
 
 
Balance at beginning of period
 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized holding gains (losses) arising during the period
 
(1,483
)
 
370

 
(1,113
)
 
—

 
—

 
—

Amounts reclassified to interest on borrowings
 
—

 
—

 
—

 
—

 
—

 
—

Balance at end of period
 
(1,483
)
 
370

 
(1,113
)
 
—

 
—

 
—

Total accumulated other comprehensive income (loss)
 
$
(8,315
)
 
$
2,075

 
$
(6,240
)
 
$
10,919

 
$
(4,178
)
 
$
6,741