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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

X
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- Definition Amortized cost of investments in available-for-sale securities that have been in a loss position for more than twelve months. + References No definition available. + Details
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