Security Types (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	$ 0	$ 111
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	1,865	1,830
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	47,436	45,771
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	220,918	211,763
Available-for-sale Securities, Fair Value, Total	270,219	259,475
Available-for-sale Securities, Gross Unrealized Gain	7,401	8,534
Available-for-sale Securities, Gross Unrealized Losses	561	335
Available-for-sale Securities, Amortized Cost Basis	263,379	251,276
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	20,026	20,065
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	24,171	19,460
Available-for-sale Securities, Fair Value, Total	44,197	39,525
Available-for-sale Securities, Gross Unrealized Gain	127	187
Available-for-sale Securities, Gross Unrealized Losses	276	19
Available-for-sale Securities, Amortized Cost Basis	44,346	39,357
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	4,327	4,700
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	146,115	136,760
Available-for-sale Securities, Fair Value, Total	150,442	141,460
Available-for-sale Securities, Gross Unrealized Gain	2,723	3,012
Available-for-sale Securities, Gross Unrealized Losses	124	162
Available-for-sale Securities, Amortized Cost Basis	147,843	138,610
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	0	111
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	1,865	1,830
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	23,083	21,006
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	49,972	54,891
Available-for-sale Securities, Fair Value, Total	74,920	77,838
Available-for-sale Securities, Gross Unrealized Gain	4,423	5,222
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Amortized Cost Basis	70,497	72,616
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	660	652
Available-for-sale Securities, Fair Value, Total	660	652
Available-for-sale Securities, Gross Unrealized Gain	128	113
Available-for-sale Securities, Gross Unrealized Losses	161	154
Available-for-sale Securities, Amortized Cost Basis	$ 693	$ 693