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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 Security | Sep. 30, 2012 | Dec. 31, 2012
Securities Available for Sale [Abstract] |  |  |
Amortized Cost | $ 267,919 |  | $ 268,527
Gross Unrealized Gains | 298 |  | 974
Gross Unrealized Losses | (10,863) |  | (1,200)
Fair Value | 257,354 |  | 268,301
Securities Held to Maturity [Abstract] |  |  |
Fair Value | 39 |  | 42
Available-for-sale Amortized Cost [Abstract] |  |  |
Due in One Year or Less | 273 |  |
Due After One Year Through Five Years | 2,599 |  |
Due After Five Years Through Ten Years | 1,604 |  |
Due After Ten Years | 1,020 |  |
Total | 5,496 |  |
Mortgage-Backed Securities | 262,423 |  |
Amortized Cost | 267,919 |  |
Available-for-sale Fair Value [Abstract] |  |  |
Due in One Year or Less | 276 |  |
Due After One Year Through Five Years | 2,694 |  |
Due After Five Years Through Ten Years | 1,582 |  |
Due After Ten Years | 736 |  |
Total | 5,288 |  |
Mortgage-Backed Securities | 252,066 |  |
Fair Value | 257,354 |  |
Held-to-maturity Amortized Cost [Abstract] |  |  |
Due in One Year or Less | 0 |  |
Due After One Year Through Five Years | 39 |  |
Due After Five Years Through Ten Years | 0 |  |
Due After Ten Years | 0 |  |
Total | 39 |  |
Mortgage-Backed Securities | 0 |  |
Amortized Cost | 39 |  |
Held-to-maturity Fair Value [Abstract] |  |  |
Due in One Year or Less | 0 |  |
Due After One Year Through Five Years | 39 |  |
Due After Five Years Through Ten Years | 0 |  |
Due After Ten Years | 0 |  |
Total | 39 |  |
Mortgage-Backed Securities | 0 |  |
Fair Value | 39 |  |
Proceeds from sale of investment securities available for sale | 36,217 | 161,811 |
Available-for-sale securities, gross realized gains | 191 | 2,204 |
Available-for-sale securities, gross realized losses | (193) | (137) |
Other than temporary impairment charges |  | (60) |
Fair value of securities on nonaccrual status | 132 |  | 132
Investment securities pledged | 93,350 |  | 117,451
Continuous unrealized loss position [Abstract] |  |  |
Less Than 12 Months, Fair value | 223,253 |  | 143,535
12 Months or Greater, Fair value | 5,585 |  | 132
Total, Fair Value | 228,838 |  | 143,667
Less Than 12 Months, Gross Unrealized Losses | (10,528) |  | (966)
12 Months or Greater, Gross Unrealized Losses | (335) |  | (234)
Total, Unrealized Losses | (10,863) |  | (1,200)
Debt securities with unrealized losses, depreciated (in hundredths) | 4.53% |  |
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 |  |
US Government Agencies Mortgage-Backed [Member] |  |  |
Securities Available for Sale [Abstract] |  |  |
Amortized Cost | 262,423 |  | 263,187
Gross Unrealized Gains | 199 |  | 835
Gross Unrealized Losses | (10,556) |  | (962)
Fair Value | 252,066 |  | 263,060
Continuous unrealized loss position [Abstract] |  |  |
Less Than 12 Months, Fair value | 221,584 |  | 142,104
12 Months or Greater, Fair value | 5,453 |  | 0
Total, Fair Value | 227,037 |  | 142,104
Less Than 12 Months, Gross Unrealized Losses | (10,456) |  | (962)
12 Months or Greater, Gross Unrealized Losses | (100) |  | 0
Total, Unrealized Losses | (10,556) |  | (962)
State, County & Municipal [Member] |  |  |
Securities Available for Sale [Abstract] |  |  |
Amortized Cost | 4,129 |  | 3,974
Gross Unrealized Gains | 17 |  | 34
Gross Unrealized Losses | (72) |  | (4)
Fair Value | 4,074 |  | 4,004
Securities Held to Maturity [Abstract] |  |  |
Amortized Cost | 39 |  | 41
Gross Unrealized Gains | 0 |  | 1
Gross Unrealized Losses | 0 |  | 0
Fair Value | 39 |  | 42
Continuous unrealized loss position [Abstract] |  |  |
Less Than 12 Months, Fair value | 1,669 |  | 1,431
12 Months or Greater, Fair value | 0 |  | 0
Total, Fair Value | 1,669 |  | 1,431
Less Than 12 Months, Gross Unrealized Losses | (72) |  | (4)
12 Months or Greater, Gross Unrealized Losses | 0 |  | 0
Total, Unrealized Losses | (72) |  | (4)
Corporate Obligations [Member] |  |  |
Securities Available for Sale [Abstract] |  |  |
Amortized Cost | 1,000 |  | 1,000
Gross Unrealized Gains | 82 |  | 105
Gross Unrealized Losses | 0 |  | 0
Fair Value | 1,082 |  | 1,105
Asset-Backed Securities [Member] |  |  |
Securities Available for Sale [Abstract] |  |  |
Amortized Cost | 367 |  | 366
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (235) |  | (234)
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) |  | (234)
Total, Unrealized Losses | $ (235) |  | $ (234)

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