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Securities Purchased Under Agreements to Resell and Investment (Gains and losses by category) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
12 months or more    
Available for sale - Amortized cost $ 24,344 $ 23,485
Available for sale - Unrealized Loss 5,471 5,718
Available-for-sale, Fair Value 18,873 17,767
Less than 12 months    
Available for sale - Amortized cost 402,468 534,577
Available for sale - Unrealized Loss 8,721 14,996
Available for sale - Fair Value 393,747 519,581
Available for sale - amortized cost 426,812 558,062
Available for sale - unrealized loss 14,192 20,714
Total Fair Value 412,620 537,348
Collateralized Mortgage Obligations [Member]
   
12 months or more    
Available for sale - Amortized cost 1,897 2,559
Available for sale - Unrealized Loss 163 237
Available-for-sale, Fair Value 1,734 2,322
Less than 12 months    
Available for sale - Amortized cost 177,882 182,661
Available for sale - Unrealized Loss 3,976 6,577
Available for sale - Fair Value 173,906 176,084
Available for sale - amortized cost 179,779 185,220
Available for sale - unrealized loss 4,139 6,814
Total Fair Value 175,640 178,406
US States and Political Subdivisions Debt Securities [Member]
   
12 months or more    
Available for sale - Amortized cost 22,367 20,845
Available for sale - Unrealized Loss 5,298 5,470
Available-for-sale, Fair Value 17,069 15,375
Less than 12 months    
Available for sale - Amortized cost   100,190
Available for sale - Unrealized Loss   1,375
Available for sale - Fair Value   98,815
Available for sale - amortized cost 22,367 121,035
Available for sale - unrealized loss 5,298 6,845
Total Fair Value 17,069 114,190
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
12 months or more    
Available for sale - Amortized cost 80 81
Available for sale - Unrealized Loss 10 11
Available-for-sale, Fair Value 70 70
Less than 12 months    
Available for sale - Amortized cost 121 122
Available for sale - Unrealized Loss 13 13
Available for sale - Fair Value 108 109
Available for sale - amortized cost 201 203
Available for sale - unrealized loss 23 24
Total Fair Value 178 179
FNMA and FHLMC [Member]
   
Less than 12 months    
Available for sale - Amortized cost 214,926 220,913
Available for sale - Unrealized Loss 4,690 6,669
Available for sale - Fair Value 210,236 214,244
Available for sale - amortized cost 214,926 220,913
Available for sale - unrealized loss 4,690 6,669
Total Fair Value 210,236 214,244
Other Debt Obligations [Member]
   
Less than 12 months    
Available for sale - Amortized cost   20,000
Available for sale - Unrealized Loss   320
Available for sale - Fair Value   19,680
Available for sale - amortized cost   20,000
Available for sale - unrealized loss   320
Total Fair Value   19,680
US Government-sponsored Enterprises Debt Securities [Member]
   
Less than 12 months    
Available for sale - Amortized cost 9,539 10,691
Available for sale - Unrealized Loss 42 42
Available for sale - Fair Value 9,497 10,649
Available for sale - amortized cost 9,539 10,691
Available for sale - unrealized loss 42 42
Total Fair Value $ 9,497 $ 10,649