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Investment Securities (Tables)
3 Months Ended
Mar. 31, 2012
Investment Securities [Abstract]  
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Securities Portfolio
                   
    Amortized   Unrealized    Unrealized     Fair
(dollars in thousands)   Cost   Gains   Losses     Value
March 31, 2012                  
Available-for-sale                  
U.S. Treasury $ 65,182 $ 314 $ 0   $ 65,496
U.S. Government-sponsored entities and agencies   276,642   1,269   (1,909 )   276,002
Mortgage-backed securities - Agency   1,181,418   31,806   (113 )   1,213,111
Mortgage-backed securities - Non-agency   84,163   617   (2,115 )   82,665
States and political subdivisions   422,497   28,162   (1,576 )   449,083
Pooled trust preferrred securities   25,465   0   (17,668 )   7,797
Other securities   150,622   9,241   (1,835 )   158,028
Total available-for-sale securities $ 2,205,989 $ 71,409 $ (25,216 ) $ 2,252,182
Held-to-maturity                  
U.S. Government-sponsored entities and agencies $ 176,366 $ 9,848 $ 0   $ 186,214
Mortgage-backed securities - Agency   76,925   3,031   0     79,956
States and political subdivisions   216,089   11,163   (63 )   227,189
Other securities   2,997   0   0     2,997
Total held-to-maturity securities $ 472,377 $ 24,042 $ (63 ) $ 496,356
                   
December 31, 2011                  
Available-for-sale                  
U.S. Treasury $ 65,221 $ 548 $ 0   $ 65,769
U.S. Government-sponsored entities and agencies   171,629   1,621   (65 )   173,185
Mortgage-backed securities - Agency   1,153,629   28,687   (61 )   1,182,255
Mortgage-backed securities - Non-agency   90,355   418   (4,873 )   85,900
States and political subdivisions   376,609   26,428   (193 )   402,844
Pooled trust preferrred securities   25,461   0   (18,134 )   7,327
Other securities   147,897   8,365   (2,266 )   153,996
Total available-for-sale securities $ 2,030,801 $ 66,067 $ (25,592 ) $ 2,071,276
Held-to-maturity                  
U.S. Government-sponsored entities and agencies $ 177,159 $ 11,434 $ 0   $ 188,593
Mortgage-backed securities - Agency   84,075   3,305   0     87,380
States and political subdivisions   216,345   8,548   (176 )   224,717
Other securities   7,011   0   (2 )   7,009
Total held-to-maturity securities $ 484,590 $ 23,287 $ (178 ) $ 507,699
Expected Maturities Of Investment Securities Portfolio
             
  March 31, 2012 Weighted
(dollars in thousands) Amortized Fair Average
Maturity Cost Value Yield
Available-for-sale            
Within one year $ 83,163 $ 83,581 1.82 %
One to five years   114,548   119,593 3.35  
Five to ten years   348,768   360,675 3.34  
Beyond ten years   1,659,510   1,688,333 3.36  
Total $ 2,205,989 $ 2,252,182 3.30 %
 
Held-to-maturity            
Within one year $ 3,049 $ 3,049 2.27 %
One to five years   2,350   2,410 3.29  
Five to ten years   148,411   154,819 2.95  
Beyond ten years   318,567   336,078 4.48  
Total $ 472,377 $ 496,356 3.98 %
Investment Securities With Unrealized Losses By Aggregated Major Security Type And Length Of Time In A Continuous Unrealized Loss Position
                               
    Less than 12 months     12 months or longer     Total  
    Fair   Unrealized     Fair   Unrealized     Fair   Unrealized  
(dollars in thousands)   Value   Losses     Value   Losses     Value   Losses  
March 31, 2012                              
Available-for-Sale                              
U.S. Government-sponsored entities
and agencies
$ 155,753 $ (1,909 ) $ 0 $ 0   $ 155,753 $ (1,909 )
Mortgage-backed securities - Agency   63,492   (113 )   0   0     63,492   (113 )
Mortgage-backed securities - Non-agency   26,983   (1,714 )   23,867   (401 )   50,850   (2,115 )
States and political subdivisions   41,115   (1,541 )   1,349   (35 )   42,464   (1,576 )
Pooled trust preferrred securities   0   0     7,797   (17,668 )   7,797   (17,668 )
Other securities   4,082   (32 )   6,273   (1,803 )   10,355   (1,835 )
Total available-for-sale $ 291,425 $ (5,309 ) $ 39,286 $ (19,907 ) $ 330,711 $ (25,216 )
 
Held-to-Maturity                              
States and political subdivisions $ 3,618 $ (63 ) $ 52 $ 0   $ 3,670 $ (63 )
Total held-to-maturity $ 3,618 $ (63 ) $ 52 $ 0   $ 3,670 $ (63 )
                               
December 31, 2011                              
Available-for-Sale                              
U.S. Government-sponsored entities                              
and agencies $ 24,935 $ (65 ) $ 0 $ 0   $ 24,935 $ (65 )
Mortgage-backed securities - Agency   49,016   (61 )   3   0     49,019   (61 )
Mortgage-backed securities - Non-agency   10,053   (353 )   59,203   (4,520 )   69,256   (4,873 )
States and political subdivisions   9,281   (114 )   1,345   (79 )   10,626   (193 )
Pooled trust preferrred securities   0   0     7,327   (18,134 )   7,327   (18,134 )
Other securities   4,516   (141 )   6,218   (2,125 )   10,734   (2,266 )
Total available-for-sale $ 97,801 $ (734 ) $ 74,096 $ (24,858 ) $ 171,897 $ (25,592 )
 
Held-to-Maturity                              
States and political subdivisions $ 1,613 $ (1 ) $ 13,180 $ (175 ) $ 14,793 $ (176 )
Other securities   22   (2 )   0   0     22   (2 )
Total held-to-maturity $ 1,635 $ (3 ) $ 13,180 $ (175 ) $ 14,815 $ (178 )
Pooled Trust Preferred Securities
Securities With Other-Than-Temporary-Impairment
Securities With Other-Than-Temporary-Impairment, Cumulative Other-Than-Temporary-Impairment