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Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 security | Dec. 31, 2012 security
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 52 |  | 10 |
Number of Securities, 12 months or longer | 11 |  | 4 |
Number of Securities, Total | 63 |  | 14 |
Fair Value - Less than 12 months | $ 416,122 |  | $ 50,415 |
Fair Value - 12 months or longer | 31,871 |  | 12,088 |
Fair Value - Total | 447,993 |  | 62,503 |
Gross Unrealized Losses - Less than 12 months | (20,227) |  | (707) |
Gross Unrealized Losses - 12 months or longer | (2,466) |  | (729) |
Gross Unrealized Losses - Total | (22,693) |  | (1,436) |
Collateralized mortgage obligations |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 21 | [1] | 3 | [1]
Number of Securities, 12 months or longer | 3 | [1] | 0 | [1]
Number of Securities, Total | 24 | [1] | 3 | [1]
Fair Value - Less than 12 months | 198,713 | [1] | 18,009 | [1]
Fair Value - 12 months or longer | 13,381 | [1] | 0 | [1]
Fair Value - Total | 212,094 | [1] | 18,009 | [1]
Gross Unrealized Losses - Less than 12 months | (12,460) | [1] | (110) | [1]
Gross Unrealized Losses - 12 months or longer | (1,151) | [1] | 0 | [1]
Gross Unrealized Losses - Total | (13,611) | [1] | (110) | [1]
Mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 29 | [1] | 7 | [1]
Number of Securities, 12 months or longer | 7 | [1] | 3 | [1]
Number of Securities, Total | 36 | [1] | 10 | [1]
Fair Value - Less than 12 months | 203,276 | [1] | 32,406 | [1]
Fair Value - 12 months or longer | 14,793 | [1] | 8,251 | [1]
Fair Value - Total | 218,069 | [1] | 40,657 | [1]
Gross Unrealized Losses - Less than 12 months | (7,293) | [1] | (597) | [1]
Gross Unrealized Losses - 12 months or longer | (496) | [1] | (64) | [1]
Gross Unrealized Losses - Total | (7,789) | [1] | (661) | [1]
Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 1 |  |  |
Number of Securities, 12 months or longer | 0 | [1] |  |
Number of Securities, Total | 1 | [1] |  |
Fair Value - Less than 12 months | 1,112 |  |  |
Fair Value - 12 months or longer | 0 | [1] |  |
Fair Value - Total | 1,112 | [1] |  |
Gross Unrealized Losses - Less than 12 months | (70) |  |  |
Gross Unrealized Losses - 12 months or longer | 0 | [1] |  |
Gross Unrealized Losses - Total | (70) | [1] |  |
Trust preferred securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 0 |  | 0 |
Number of Securities, 12 months or longer | 1 |  | 1 |
Number of Securities, Total | 1 |  | 1 |
Fair Value - Less than 12 months | 0 |  | 0 |
Fair Value - 12 months or longer | 3,697 |  | 3,837 |
Fair Value - Total | 3,697 |  | 3,837 |
Gross Unrealized Losses - Less than 12 months | 0 |  | 0 |
Gross Unrealized Losses - 12 months or longer | (819) |  | (665) |
Gross Unrealized Losses - Total | (819) |  | (665) |
Mutual funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Number of Securities, Less than 12 months | 1 |  | 0 |
Number of Securities, 12 months or longer | 0 |  | 0 |
Number of Securities, Total | 1 |  | 0 |
Fair Value - Less than 12 months | 13,021 |  | 0 |
Fair Value - 12 months or longer | 0 |  | 0 |
Fair Value - Total | 13,021 |  | 0 |
Gross Unrealized Losses - Less than 12 months | (404) |  | 0 |
Gross Unrealized Losses - 12 months or longer | 0 |  | 0 |
Gross Unrealized Losses - Total | $ (404) |  | $ 0 |
[1] | Investments in U.S. Government agency and U.S. Government sponsored enterprises

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