Loans (Details 3) (USD $)				9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013 Greater than	Sep. 30, 2013 Commercial	Dec. 31, 2012 Commercial	Sep. 30, 2012 Commercial	Sep. 30, 2013 Real estate - commercial	Sep. 30, 2012 Real estate - commercial	Sep. 30, 2013 Real estate - commercial Owner occupied general purpose	Dec. 31, 2012 Real estate - commercial Owner occupied general purpose	Sep. 30, 2013 Real estate - commercial Owner occupied special purpose	Dec. 31, 2012 Real estate - commercial Owner occupied special purpose	Sep. 30, 2013 Real estate - commercial Non-owner occupied general purpose	Dec. 31, 2012 Real estate - commercial Non-owner occupied general purpose	Sep. 30, 2013 Real estate - commercial Non-owner occupied special purpose	Dec. 31, 2012 Real estate - commercial Non-owner occupied special purpose	Sep. 30, 2013 Real estate - commercial Retail properties	Dec. 31, 2012 Real estate - commercial Retail properties	Sep. 30, 2013 Real estate - commercial Farm	Dec. 31, 2012 Real estate - commercial Farm	Sep. 30, 2013 Real estate - construction	Sep. 30, 2012 Real estate - construction	Sep. 30, 2013 Real estate - construction Homebuilder	Dec. 31, 2012 Real estate - construction Homebuilder	Sep. 30, 2013 Real estate - construction Land	Dec. 31, 2012 Real estate - construction Land	Sep. 30, 2013 Real estate - construction Commercial speculative	Dec. 31, 2012 Real estate - construction Commercial speculative	Sep. 30, 2013 Real estate - construction All other	Dec. 31, 2012 Real estate - construction All other	Sep. 30, 2013 Real estate - residential	Sep. 30, 2012 Real estate - residential	Sep. 30, 2013 Real estate - residential Investor	Dec. 31, 2012 Real estate - residential Investor	Sep. 30, 2013 Real estate - residential Owner occupied	Dec. 31, 2012 Real estate - residential Owner occupied	Sep. 30, 2013 Real estate - residential Revolving and junior liens	Dec. 31, 2012 Real estate - residential Revolving and junior liens	Sep. 30, 2013 Consumer	Dec. 31, 2012 Consumer	Sep. 30, 2012 Consumer	Sep. 30, 2013 All other	Dec. 31, 2012 All other	Sep. 30, 2012 All other	Sep. 30, 2013 Pass	Dec. 31, 2012 Pass	Sep. 30, 2013 Pass Commercial	Dec. 31, 2012 Pass Commercial	Sep. 30, 2013 Pass Real estate - commercial Owner occupied general purpose	Dec. 31, 2012 Pass Real estate - commercial Owner occupied general purpose	Sep. 30, 2013 Pass Real estate - commercial Owner occupied special purpose	Dec. 31, 2012 Pass Real estate - commercial Owner occupied special purpose	Sep. 30, 2013 Pass Real estate - commercial Non-owner occupied general purpose	Dec. 31, 2012 Pass Real estate - commercial Non-owner occupied general purpose	Sep. 30, 2013 Pass Real estate - commercial Non-owner occupied special purpose	Dec. 31, 2012 Pass Real estate - commercial Non-owner occupied special purpose	Sep. 30, 2013 Pass Real estate - commercial Retail properties	Dec. 31, 2012 Pass Real estate - commercial Retail properties	Sep. 30, 2013 Pass Real estate - commercial Farm	Dec. 31, 2012 Pass Real estate - commercial Farm	Sep. 30, 2013 Pass Real estate - construction Homebuilder	Dec. 31, 2012 Pass Real estate - construction Homebuilder	Sep. 30, 2013 Pass Real estate - construction Land	Dec. 31, 2012 Pass Real estate - construction Land	Sep. 30, 2013 Pass Real estate - construction Commercial speculative	Dec. 31, 2012 Pass Real estate - construction Commercial speculative	Sep. 30, 2013 Pass Real estate - construction All other	Dec. 31, 2012 Pass Real estate - construction All other	Sep. 30, 2013 Pass Real estate - residential Investor	Dec. 31, 2012 Pass Real estate - residential Investor	Sep. 30, 2013 Pass Real estate - residential Owner occupied	Dec. 31, 2012 Pass Real estate - residential Owner occupied	Sep. 30, 2013 Pass Real estate - residential Revolving and junior liens	Dec. 31, 2012 Pass Real estate - residential Revolving and junior liens	Sep. 30, 2013 Pass Consumer	Dec. 31, 2012 Pass Consumer	Sep. 30, 2013 Pass All other	Dec. 31, 2012 Pass All other	Sep. 30, 2013 Special Mention	Dec. 31, 2012 Special Mention	Sep. 30, 2013 Special Mention Commercial	Dec. 31, 2012 Special Mention Commercial	Sep. 30, 2013 Special Mention Real estate - commercial Owner occupied general purpose	Dec. 31, 2012 Special Mention Real estate - commercial Owner occupied general purpose	Sep. 30, 2013 Special Mention Real estate - commercial Owner occupied special purpose	Dec. 31, 2012 Special Mention Real estate - commercial Owner occupied special purpose	Sep. 30, 2013 Special Mention Real estate - commercial Non-owner occupied general purpose	Dec. 31, 2012 Special Mention Real estate - commercial Non-owner occupied general purpose	Sep. 30, 2013 Special Mention Real estate - commercial Non-owner occupied special purpose	Dec. 31, 2012 Special Mention Real estate - commercial Non-owner occupied special purpose	Sep. 30, 2013 Special Mention Real estate - commercial Retail properties	Dec. 31, 2012 Special Mention Real estate - commercial Retail properties	Sep. 30, 2013 Special Mention Real estate - commercial Farm	Dec. 31, 2012 Special Mention Real estate - commercial Farm	Sep. 30, 2013 Special Mention Real estate - construction Homebuilder	Dec. 31, 2012 Special Mention Real estate - construction Homebuilder	Sep. 30, 2013 Special Mention Real estate - construction Commercial speculative	Sep. 30, 2013 Special Mention Real estate - construction All other	Dec. 31, 2012 Special Mention Real estate - construction All other	Sep. 30, 2013 Special Mention Real estate - residential Investor	Dec. 31, 2012 Special Mention Real estate - residential Investor	Sep. 30, 2013 Special Mention Real estate - residential Owner occupied	Dec. 31, 2012 Special Mention Real estate - residential Owner occupied	Sep. 30, 2013 Special Mention Real estate - residential Revolving and junior liens	Dec. 31, 2012 Special Mention Real estate - residential Revolving and junior liens	Dec. 31, 2012 Special Mention All other	Sep. 30, 2013 Substandard	Dec. 31, 2012 Substandard	Sep. 30, 2013 Substandard Commercial	Dec. 31, 2012 Substandard Commercial	Sep. 30, 2013 Substandard Real estate - commercial Owner occupied general purpose	Dec. 31, 2012 Substandard Real estate - commercial Owner occupied general purpose	Sep. 30, 2013 Substandard Real estate - commercial Owner occupied special purpose	Dec. 31, 2012 Substandard Real estate - commercial Owner occupied special purpose	Sep. 30, 2013 Substandard Real estate - commercial Non-owner occupied general purpose	Dec. 31, 2012 Substandard Real estate - commercial Non-owner occupied general purpose	Sep. 30, 2013 Substandard Real estate - commercial Non-owner occupied special purpose	Dec. 31, 2012 Substandard Real estate - commercial Non-owner occupied special purpose	Sep. 30, 2013 Substandard Real estate - commercial Retail properties	Dec. 31, 2012 Substandard Real estate - commercial Retail properties	Dec. 31, 2012 Substandard Real estate - commercial Farm	Sep. 30, 2013 Substandard Real estate - construction Homebuilder	Dec. 31, 2012 Substandard Real estate - construction Homebuilder	Sep. 30, 2013 Substandard Real estate - construction Land	Dec. 31, 2012 Substandard Real estate - construction Land	Sep. 30, 2013 Substandard Real estate - construction Commercial speculative	Dec. 31, 2012 Substandard Real estate - construction Commercial speculative	Sep. 30, 2013 Substandard Real estate - construction All other	Dec. 31, 2012 Substandard Real estate - construction All other	Sep. 30, 2013 Substandard Real estate - residential Investor	Dec. 31, 2012 Substandard Real estate - residential Investor	Sep. 30, 2013 Substandard Real estate - residential Owner occupied	Dec. 31, 2012 Substandard Real estate - residential Owner occupied	Sep. 30, 2013 Substandard Real estate - residential Revolving and junior liens	Dec. 31, 2012 Substandard Real estate - residential Revolving and junior liens	Sep. 30, 2013 Substandard Consumer	Dec. 31, 2012 Substandard Consumer
Loans by risk rating
Loan commitment for inclusion in credit quality analysis				$ 50,000
Total Loans	$ 1,077,640,000	$ 1,150,050,000	$ 1,208,289,000		$ 98,026,000	$ 93,001,000	$ 84,667,000	$ 554,874,000	$ 621,715,000	$ 113,246,000	$ 127,111,000	$ 169,259,000	$ 161,044,000	$ 135,357,000	$ 143,299,000	$ 76,033,000	$ 74,080,000	$ 44,885,000	$ 48,264,000	$ 16,094,000	$ 25,889,000	$ 30,996,000	$ 48,606,000	$ 4,731,000	$ 6,324,000	$ 4,849,000	$ 3,001,000	$ 12,345,000	$ 17,342,000	$ 9,071,000	$ 15,500,000	$ 376,859,000	$ 436,837,000	$ 130,551,000	$ 150,491,000	$ 118,998,000	$ 124,200,000	$ 127,310,000	$ 139,852,000	$ 2,570,000	$ 3,101,000	$ 3,167,000	$ 14,315,000	$ 17,551,000	$ 13,297,000	$ 964,739,000	$ 978,118,000	$ 89,051,000	$ 88,071,000	$ 97,309,000	$ 113,118,000	$ 159,678,000	$ 134,152,000	$ 118,741,000	$ 105,192,000	$ 61,874,000	$ 68,682,000	$ 35,833,000	$ 32,715,000	$ 14,607,000	$ 21,262,000	$ 1,216,000	$ 1,318,000	$ 4,640,000	$ 2,747,000	$ 5,232,000	$ 7,122,000	$ 8,289,000	$ 14,607,000	$ 116,627,000	$ 123,876,000	$ 111,323,000	$ 110,858,000	$ 123,435,000	$ 133,992,000	$ 2,569,000	$ 3,075,000	$ 14,315,000	$ 17,331,000	$ 43,959,000	$ 55,688,000	$ 8,711,000	$ 3,867,000	$ 8,560,000	$ 2,995,000	$ 1,480,000	$ 9,036,000	$ 1,574,000	$ 14,273,000	$ 9,893,000	$ 3,911,000	$ 3,006,000	$ 1,873,000	$ 1,487,000	$ 2,110,000	$ 1,770,000	$ 2,196,000	$ 3,579,000	$ 34,000	$ 37,000	$ 3,282,000	$ 14,608,000	$ 383,000	$ 396,000	$ 200,000	$ 166,000	$ 220,000	$ 68,942,000	$ 116,244,000	$ 264,000	$ 1,063,000	$ 7,377,000	$ 10,998,000	$ 8,101,000	$ 17,856,000	$ 15,042,000	$ 23,834,000	$ 4,266,000	$ 1,487,000	$ 6,046,000	$ 13,676,000	$ 2,517,000	$ 1,745,000	$ 2,810,000	$ 209,000	$ 254,000	$ 3,534,000	$ 10,220,000	$ 748,000	$ 856,000	$ 10,642,000	$ 12,007,000	$ 7,292,000	$ 12,946,000	$ 3,675,000	$ 5,694,000	$ 1,000	$ 26,000