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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Activity within Accumulated Other Comprehensive Income (Loss), Net of Tax
The following table illustrates the activity within accumulated other comprehensive income (loss) by component, net of tax:
 
(Dollars in thousands)
Gains on Available-For-Sale Securities
 
Losses on Derivatives Used for Cash Flow Hedges
 
Total
Balance at December 31, 2015
$
13,935

 
(11,946
)
 
1,989

Other comprehensive income (loss) before reclassifications
18,755

 
(7,344
)
 
11,411

Amounts reclassified from accumulated other comprehensive income
399

 
3,039

 
3,438

Net current period other comprehensive income (loss)
19,154

 
(4,305
)
 
14,849

Balance at September 30, 2016
$
33,089

 
(16,251
)
 
16,838

Balance at December 31, 2016
$
1,639

 
(9,021
)
 
(7,382
)
Other comprehensive income (loss) before reclassifications
10,520

 
(1,102
)
 
9,418

Amounts reclassified from accumulated other comprehensive income
318

 
2,313

 
2,631

Net current period other comprehensive income
10,838

 
1,211

 
12,049

Balance at September 30, 2017
$
12,477

 
(7,810
)
 
4,667