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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Securities Available for Sale: |  |  |  |
Amortized Cost |  | $ 241,092 |  | $ 300,998
Gross Unrealized Gains |  | 1,734 |  | 3,408
Gross Unrealized Losses |  | (729) |  | (515)
Fair Value |  | 242,097 |  | 303,891
Securities Held to Maturity: |  |  |  |
Fair Value |  | 46 |  | 46
Available-for-sale Amortized Cost [Abstract] |  |  |  |
Due Less Than One Year |  | 125 |  |
Due After One Year Through Five Years |  | 2,697 |  |
Due After Five Years Through Ten Years |  | 1,965 |  |
Due After Ten Years |  | 575 |  |
Total |  | 5,362 |  |
Mortgage-Backed Securities |  | 235,730 |  |
Amortized Cost |  | 241,092 |  | 300,998
Available-for-sale Fair Value [Abstract] |  |  |  |
Due Less Than One Year |  | 127 |  |
Due After One Year Through Five Years |  | 2,847 |  |
Due After Five Years Through Ten Years |  | 1,973 |  |
Due After Ten Years |  | 340 |  |
Total |  | 5,287 |  |
Mortgage-Backed Securities |  | 236,810 |  |
Fair Value |  | 242,097 |  | 303,891
Held-to-maturity Amortized Cost [Abstract] |  |  |  |
Due Less Than One Year |  | 0 |  |
Due After One Year Through Five Years |  | 45 |  |
Due After Five Years Through Ten Years |  | 0 |  |
Due After Ten Years |  | 0 |  |
Total |  | 45 |  |
Mortgage-Backed Securities |  | 0 |  |
Amortized Cost |  | 45 |  |
Held-to-maturity Fair Value [Abstract] |  |  |  |
Due Less Than One Year |  | 0 |  |
Due After One Year Through Five Years |  | 46 |  |
Due After Five Years Through Ten Years |  | 0 |  |
Due After Ten Years |  | 0 |  |
Total |  | 46 |  |
Mortgage-Backed Securities |  | 0 |  |
Fair Value |  | 46 |  | 46
Proceeds from sale of investment securities available for sale |  | 161,811 | 251,044 |
Available-for-sale securities, gross realized gains |  | 2,204 | 1,947 |
Available-for-sale securities, gross realized losses |  | (137) | (2) |
Other than temporary impairment charges |  | (60) |  |
Fair value of securities on nonaccrual status |  | 132 |  | 132
Investment securities pledged |  | 78,187 |  | 136,838
Continuous unrealized loss position [Abstract] |  |  |  |
Less Than 12 Months, Fair value |  | 68,596 |  | 27,664
12 Months or Greater, Fair value |  | 2,367 |  | 1,195
Total, Fair Value |  | 70,963 |  | 28,859
Less Than 12 Months, Gross Unrealized Losses |  | (465) |  | (209)
12 Months or Greater, Gross Unrealized Losses |  | (264) |  | (306)
Total, Unrealized Losses |  | (729) |  | (515)
Debt securities with unrealized losses, depreciated (in hundredths) |  | 1.02% |  |
Number of asset-backed security owned |  | 1 |  |
Periods for asset-backed security in continuous unrealized loss position, minimum |  | 12 months |  |
Number of issuance of trust preferred security |  | 1 |  |
Book value of trust preferred security |  | 367 |  |
Unrealized loss on trust preferred security |  | 235 |  |
Other than temporary impairment written off | 60 |  |  |
US Government Agencies Mortgage-Backed [Member] |  |  |  |
Securities Available for Sale: |  |  |  |
Amortized Cost |  | 235,730 |  | 291,097
Gross Unrealized Gains |  | 1,573 |  | 3,152
Gross Unrealized Losses |  | (493) |  | (188)
Fair Value |  | 236,810 |  | 294,061
Available-for-sale Amortized Cost [Abstract] |  |  |  |
Amortized Cost |  | 235,730 |  | 291,097
Available-for-sale Fair Value [Abstract] |  |  |  |
Fair Value |  | 236,810 |  | 294,061
Continuous unrealized loss position [Abstract] |  |  |  |
Less Than 12 Months, Fair value |  | 68,388 |  | 26,440
12 Months or Greater, Fair value |  | 2,235 |  | 0
Total, Fair Value |  | 70,623 |  | 26,440
Less Than 12 Months, Gross Unrealized Losses |  | (464) |  | (188)
12 Months or Greater, Gross Unrealized Losses |  | (29) |  | 0
Total, Unrealized Losses |  | (493) |  | (188)
State, County & Municipal [Member] |  |  |  |
Securities Available for Sale: |  |  |  |
Amortized Cost |  | 3,995 |  | 7,475
Gross Unrealized Gains |  | 43 |  | 132
Gross Unrealized Losses |  | (1) |  | (23)
Fair Value |  | 4,037 |  | 7,584
Securities Held to Maturity: |  |  |  |
Amortized Cost |  | 45 |  | 46
Gross Unrealized Gains |  | 1 |  | 0
Gross Unrealized Losses |  | 0 |  | 0
Fair Value |  | 46 |  | 46
Available-for-sale Amortized Cost [Abstract] |  |  |  |
Amortized Cost |  | 3,995 |  | 7,475
Available-for-sale Fair Value [Abstract] |  |  |  |
Fair Value |  | 4,037 |  | 7,584
Held-to-maturity Fair Value [Abstract] |  |  |  |
Fair Value |  | 46 |  | 46
Continuous unrealized loss position [Abstract] |  |  |  |
Less Than 12 Months, Fair value |  | 208 |  | 1,224
12 Months or Greater, Fair value |  | 0 |  | 73
Total, Fair Value |  | 208 |  | 1,297
Less Than 12 Months, Gross Unrealized Losses |  | (1) |  | (21)
12 Months or Greater, Gross Unrealized Losses |  | 0 |  | (2)
Total, Unrealized Losses |  | (1) |  | (23)
Corporate Obligations [Member] |  |  |  |
Securities Available for Sale: |  |  |  |
Amortized Cost |  | 1,000 |  | 2,000
Gross Unrealized Gains |  | 118 |  | 124
Gross Unrealized Losses |  | 0 |  | (10)
Fair Value |  | 1,118 |  | 2,114
Available-for-sale Amortized Cost [Abstract] |  |  |  |
Amortized Cost |  | 1,000 |  | 2,000
Available-for-sale Fair Value [Abstract] |  |  |  |
Fair Value |  | 1,118 |  | 2,114
Continuous unrealized loss position [Abstract] |  |  |  |
Less Than 12 Months, Fair value |  |  |  | 0
12 Months or Greater, Fair value |  |  |  | 990
Total, Fair Value |  |  |  | 990
Less Than 12 Months, Gross Unrealized Losses |  |  |  | 0
12 Months or Greater, Gross Unrealized Losses |  |  |  | (10)
Total, Unrealized Losses |  |  |  | (10)
Asset-Backed Securities [Member] |  |  |  |
Securities Available for Sale: |  |  |  |
Amortized Cost |  | 367 |  | 426
Gross Unrealized Gains |  | 0 |  | 0
Gross Unrealized Losses |  | (235) |  | (294)
Fair Value |  | 132 |  | 132
Available-for-sale Amortized Cost [Abstract] |  |  |  |
Amortized Cost |  | 367 |  | 426
Available-for-sale Fair Value [Abstract] |  |  |  |
Fair Value |  | 132 |  | 132
Continuous unrealized loss position [Abstract] |  |  |  |
Less Than 12 Months, Fair value |  | 0 |  | 0
12 Months or Greater, Fair value |  | 132 |  | 132
Total, Fair Value |  | 132 |  | 132
Less Than 12 Months, Gross Unrealized Losses |  | 0 |  | 0
12 Months or Greater, Gross Unrealized Losses |  | (235) |  | (294)
Total, Unrealized Losses |  | $ (235) |  | $ (294)

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