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Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded $ 5,744,000 $ 12,348,000  
Upaid Principal Balance, With no related allowance recorded 6,664,000 18,628,000  
Recorded Investment, With an allowance recorded 955,000 6,478,000  
Unpaid Principal Balance, With an allowance recorded 1,027,000 6,665,000  
Related Allowance 164,000 612,000  
Total Recorded Investment 6,699,000 18,826,000  
Total Unpaid Principal Balance 7,691,000 25,293,000  
Average Recorded Investment, With no related allowance recorded 8,965,000 6,413,000 $ 7,278,000
Interest Income Recognized, With no related allowance recorded 310,000 26,000 0
Average Recorded Investment, With an allowance recorded 3,827,000 5,013,000 7,090,000
Interest Income Recognized, With an allowance recorded 0 322,000 573,000
Average Recorded Investment, Total 12,792,000 11,426,000 14,368,000
Interest Income Recognized, Total 310,000 348,000 573,000
Forgone interest on nonaccrual loans 340,000 716,000 661,000
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded   6,440,000  
Upaid Principal Balance, With no related allowance recorded   11,713,000  
Average Recorded Investment, With no related allowance recorded 2,921,000 638,000 329,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 243,000 423,000 1,309,000
Interest Income Recognized, With an allowance recorded 0 0 111,000
Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 0 6,440,000  
Upaid Principal Balance, With no related allowance recorded 1,000 9,991,000  
Recorded Investment, With an allowance recorded 30,000 828,000  
Unpaid Principal Balance, With an allowance recorded 33,000 835,000  
Related Allowance 1,000 230,000  
Average Recorded Investment, With no related allowance recorded 2,921,000 638,000 329,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 243,000 423,000 1,309,000
Interest Income Recognized, With an allowance recorded 0 0 111,000
Agricultural land and production      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded   0  
Upaid Principal Balance, With no related allowance recorded   1,722,000  
Real estate      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 4,453,000 3,889,000  
Upaid Principal Balance, With no related allowance recorded 4,672,000 4,208,000  
Recorded Investment, With an allowance recorded 746,000 4,623,000  
Unpaid Principal Balance, With an allowance recorded 800,000 4,783,000  
Related Allowance 128,000 162,000  
Average Recorded Investment, With no related allowance recorded 4,186,000 3,941,000 4,942,000
Interest Income Recognized, With no related allowance recorded 310,000 26,000 0
Average Recorded Investment, With an allowance recorded 3,240,000 4,260,000 5,292,000
Interest Income Recognized, With an allowance recorded 0 322,000 462,000
Owner occupied      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 166,000 1,188,000  
Upaid Principal Balance, With no related allowance recorded 245,000 1,255,000  
Recorded Investment, With an allowance recorded 180,000 199,000  
Unpaid Principal Balance, With an allowance recorded 212,000 219,000  
Related Allowance 18,000 30,000  
Average Recorded Investment, With no related allowance recorded 770,000 2,063,000 2,321,000
Interest Income Recognized, With no related allowance recorded 231,000 2,000 0
Average Recorded Investment, With an allowance recorded 190,000 264,000 997,000
Interest Income Recognized, With an allowance recorded 0 0 86,000
Real estate construction and other land loans      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 3,125,000 547,000  
Upaid Principal Balance, With no related allowance recorded 3,125,000 799,000  
Recorded Investment, With an allowance recorded   3,542,000  
Unpaid Principal Balance, With an allowance recorded   3,542,000  
Related Allowance   72,000  
Average Recorded Investment, With no related allowance recorded 1,266,000 1,276,000 2,342,000
Interest Income Recognized, With no related allowance recorded 79,000 24,000 0
Average Recorded Investment, With an allowance recorded 2,297,000 3,782,000 4,295,000
Interest Income Recognized, With an allowance recorded 0 267,000 329,000
Commercial real estate      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 1,162,000 1,794,000  
Upaid Principal Balance, With no related allowance recorded 1,302,000 1,794,000  
Recorded Investment, With an allowance recorded 566,000 882,000  
Unpaid Principal Balance, With an allowance recorded 588,000 1,022,000  
Related Allowance 110,000 60,000  
Average Recorded Investment, With no related allowance recorded 1,939,000 574,000 279,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 753,000 214,000 0
Interest Income Recognized, With an allowance recorded 0 55,000 47,000
Agricultural real estate      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded   360,000  
Upaid Principal Balance, With no related allowance recorded   360,000  
Average Recorded Investment, With no related allowance recorded 211,000 28,000 0
Interest Income Recognized, With no related allowance recorded 0 0 0
Consumer      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With an allowance recorded 179,000 1,027,000  
Unpaid Principal Balance, With an allowance recorded 194,000 1,047,000  
Related Allowance 35,000 220,000  
Average Recorded Investment, With no related allowance recorded 1,858,000 1,834,000 2,007,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 344,000 330,000 489,000
Interest Income Recognized, With an allowance recorded 0 0 0
Equity loans and lines of credit      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 1,291,000 2,019,000  
Upaid Principal Balance, With no related allowance recorded 1,991,000 2,707,000  
Recorded Investment, With an allowance recorded 166,000 1,008,000  
Unpaid Principal Balance, With an allowance recorded 179,000 1,026,000  
Related Allowance 33,000 217,000  
Average Recorded Investment, With no related allowance recorded 1,858,000 1,826,000 1,998,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 328,000 303,000 489,000
Interest Income Recognized, With an allowance recorded 0 0 0
Consumer and installment      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With an allowance recorded 13,000 19,000  
Unpaid Principal Balance, With an allowance recorded 15,000 21,000  
Related Allowance 2,000 3,000  
Average Recorded Investment, With no related allowance recorded 0 8,000 9,000
Interest Income Recognized, With no related allowance recorded 0 0 0
Average Recorded Investment, With an allowance recorded 16,000 27,000 0
Interest Income Recognized, With an allowance recorded $ 0 $ 0 $ 0