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Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2012
Securities Financing Transactions Disclosures [Abstract]  
Summary of repurchase agreements
 
December 31, 2012
(Dollars in thousands)
Repurchase
Amount
 
Weighted
Average
Fixed Rate
 
Amortized
Cost of
Underlying
Assets
 
Fair
Value of
Underlying
Assets
Overnight
$
285,349

 
0.32
%
 
$
287,597

 
293,958

Maturing within 30 days
4,159

 
0.50
%
 
4,228

 
4,306

 
$
289,508

 
0.32
%
 
$
291,825

 
298,264


 
December 31, 2011
(Dollars in thousands)
Repurchase
Amount
 
Weighted
Average
Fixed Rate
 
Amortized
Cost of
Underlying
Assets
 
Fair
Value of
Underlying
Assets
Overnight
$
257,802

 
0.42
%
 
$
260,124

 
265,592

Maturing within 30 days
841

 
1.00
%
 
1,855

 
1,916

 
$
258,643

 
0.42
%
 
$
261,979

 
267,508