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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Components of accumulated other comprehensive income
(Dollars in thousands)
June 30, 2013
 
December 31, 2012
Unrealized gains on available-for-sale securities
$
39,539

 
95,328

Tax effect
(15,381
)
 
(37,083
)
Net of tax amount
24,158

 
58,245

Unrealized losses on derivatives used for cash flow hedges
(1,270
)
 
(16,832
)
Tax effect
494

 
6,549

Net of tax amount
(776
)
 
(10,283
)
Total accumulated other comprehensive income
$
23,382

 
47,962