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Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months | 294,924 | 233,909
Gross Unrealized Holding Losses, Less than 12 months | 1,812 | 1,206
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value | 294,924 | 233,909
Gross Unrealized Holding Losses | 1,812 | 1,206
CMO [Member] |  |
Held-To-Maturity |  |
Fair Value, Less than 12 months | 2,280 | 2,383
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Fair Value | 2,280 | 2,383
Government Agency [Member] |  |
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months | 10,977 |
Gross Unrealized Holding Losses, Less than 12 months | 4 |
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value | 10,977 |
Gross Unrealized Holding Losses | 4 |
Residential mortgage-backed securities[Member] |  |
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months | 55,729 | 75,754
Gross Unrealized Holding Losses, Less than 12 months | 135 | 334
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value | 55,729 | 75,754
Gross Unrealized Holding Losses | 135 | 334
CMO's / REMIC's - Residential [Member] |  |
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months | 196,395 | 133,471
Gross Unrealized Holding Losses, Less than 12 months | 1,050 | 665
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value | 196,395 | 133,471
Gross Unrealized Holding Losses | 1,050 | 665
Municipal Bonds [Member] |  |
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months | 31,823 | 22,184
Gross Unrealized Holding Losses, Less than 12 months | 623 | 203
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value | 31,823 | 22,184
Gross Unrealized Holding Losses | 623 | 203
Other Securities [Member] |  |
Held-To-Maturity |  |
Fair Value, 12 months or longer |  |
Gross unrealized holding losses, 12 months or longer |  |
Available-for-Sale |  |
Fair Value, Less than 12 months |  | 2,500
Gross Unrealized Holding Losses, Less than 12 months |  | 4
Fair Value, 12 months or longer |  |
Gross Unrealized Holding Losses, 12 months or longer |  |
Fair Value |  | 2,500
Gross Unrealized Holding Losses |  | $ 4

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