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Security Types (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
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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