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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 security | Sep. 30, 2013 | Sep. 30, 2014 security | Sep. 30, 2013 | Dec. 31, 2013 security | Sep. 30, 2014 GSE collateralized mortgage obligations security | Dec. 31, 2013 GSE collateralized mortgage obligations security | Sep. 30, 2014 GSE mortgage-backed securities security | Dec. 31, 2013 GSE mortgage-backed securities security | Sep. 30, 2014 Trust preferred securities security | Dec. 31, 2013 Trust preferred securities security | Sep. 30, 2014 Municipal bonds security | Dec. 31, 2013 Municipal bonds security | Sep. 30, 2014 Mutual funds - GSE mortgage related securities security | Dec. 31, 2013 Mutual funds - GSE mortgage related securities security | Sep. 30, 2014 Credit concentration risk Stockholders' equity Non-US Government and agency securities | Dec. 31, 2013 Credit concentration risk Stockholders' equity Non-US Government and agency securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Securities, Less than 12 months | 28 |  | 28 |  | 52 | 8 | [1] | 21 | [1] | 20 | [1] | 29 | [1] | 0 | 0 | 0 | 1 | 0 | 1 |  |
Number of Securities, 12 months or longer | 22 |  | 22 |  | 11 | 13 | [1] | 3 | [1] | 6 | [1] | 7 | [1] | 1 | 1 | 1 | 0 | 1 | 0 |  |
Number of Securities, Total | 50 |  | 50 |  | 63 | 21 | [1] | 24 | [1] | 26 | [1] | 36 | [1] | 1 | 1 | 1 | 1 | 1 | 1 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value - Less than 12 months | $ 163,001,000 |  | $ 163,001,000 |  | $ 416,122,000 | $ 75,980,000 | [1] | $ 198,713,000 | [1] | $ 87,021,000 | [1] | $ 203,276,000 | [1] | $ 0 | $ 0 | $ 0 | $ 1,112,000 | $ 0 | $ 13,021,000 |  |
Fair Value - 12 months or longer | 215,841,000 |  | 215,841,000 |  | 31,871,000 | 135,497,000 | [1] | 13,381,000 | [1] | 61,916,000 | [1] | 14,793,000 | [1] | 4,050,000 | 3,697,000 | 1,146,000 | 0 | 13,232,000 | 0 |  |
Fair Value - Total | 378,842,000 |  | 378,842,000 |  | 447,993,000 | 211,477,000 | [1] | 212,094,000 | [1] | 148,937,000 | [1] | 218,069,000 | [1] | 4,050,000 | 3,697,000 | 1,146,000 | 1,112,000 | 13,232,000 | 13,021,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Unrealized Losses - Less than 12 months | (1,310,000) |  | (1,310,000) |  | (20,227,000) | (876,000) | [1] | (12,460,000) | [1] | (434,000) | [1] | (7,293,000) | [1] | 0 | 0 | 0 | (70,000) | 0 | (404,000) |  |
Gross Unrealized Losses - 12 months or longer | (8,263,000) |  | (8,263,000) |  | (2,466,000) | (4,891,000) | [1] | (1,151,000) | [1] | (2,683,000) | [1] | (496,000) | [1] | (477,000) | (819,000) | (18,000) | 0 | (194,000) | 0 |  |
Gross Unrealized Losses - Total | (9,573,000) |  | (9,573,000) |  | (22,693,000) | (5,767,000) | [1] | (13,611,000) | [1] | (3,117,000) | [1] | (7,789,000) | [1] | (477,000) | (819,000) | (18,000) | (70,000) | (194,000) | (404,000) |  |
Maximum exposure to any single issuer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00%
Gross unrealized gains (losses) included in accumulated other comprehensive income during the period |  | 2,000,000 |  | (21,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on available-for-sale securities | (3,004,000) | 2,021,000 | 14,790,000 | (21,389,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income as a result of securities being sold | $ 0 | $ 0 | $ 0 | $ 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Investments in U.S. Government agency and U.S. Government sponsored enterprises

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