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Security Types (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | $ 112 | $ 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 1,706 | 414
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 34,563 | 37,709
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 218,438 | 261,459
Available-for-sale Securities, Fair Value, Total | 254,819 | 299,582
Available-for-sale Securities, Gross Unrealized Gain | 9,911 | 7,241
Available-for-sale Securities, Gross Unrealized Losses | 173 | 551
Available-for-sale Securities, Amortized Cost Basis | 245,081 | 292,892
US Government and Government Agencies and Authorities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 10,113 | 5,013
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 24,503 | 46,072
Available-for-sale Securities, Fair Value, Total | 34,616 | 51,085
Available-for-sale Securities, Gross Unrealized Gain | 247 | 182
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1
Available-for-sale Securities, Amortized Cost Basis | 34,369 | 50,904
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 4,986 | 14,935
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 132,627 | 149,863
Available-for-sale Securities, Fair Value, Total | 137,613 | 164,798
Available-for-sale Securities, Gross Unrealized Gain | 4,077 | 2,534
Available-for-sale Securities, Gross Unrealized Losses | 0 | 129
Available-for-sale Securities, Amortized Cost Basis | 133,536 | 162,393
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 112 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 1,706 | 414
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 19,464 | 17,761
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 60,687 | 63,538
Available-for-sale Securities, Fair Value, Total | 81,969 | 81,713
Available-for-sale Securities, Gross Unrealized Gain | 5,486 | 4,339
Available-for-sale Securities, Gross Unrealized Losses | 0 | 48
Available-for-sale Securities, Amortized Cost Basis | 76,483 | 77,422
Trust Preferred Securities Pooled [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value |  | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value |  | 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value |  | 0
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value |  | 100
Available-for-sale Securities, Fair Value, Total |  | 100
Available-for-sale Securities, Gross Unrealized Gain |  | 0
Available-for-sale Securities, Gross Unrealized Losses |  | 130
Available-for-sale Securities, Amortized Cost Basis |  | 230
Trust Preferred Securities Individual Issuer [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value | 0 | 0
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 621 | 1,886
Available-for-sale Securities, Fair Value, Total | 621 | 1,886
Available-for-sale Securities, Gross Unrealized Gain | 101 | 186
Available-for-sale Securities, Gross Unrealized Losses | 173 | 243
Available-for-sale Securities, Amortized Cost Basis | $ 693 | $ 1,943

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