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Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without and Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment $ 894 $ 1,354  
Impaired loans, with no related allowance, unpaid principal balance 1,505 2,102  
Impaired loans, with related allowance, recorded investment 567 1,518  
Impaired loans, with related allowance, unpaid principal balance 567 1,518  
Impaired loans, recorded investment 1,461 2,872  
Impaired loans, unpaid principal balance 2,072 3,620  
Impaired loans, related allowance 567 751  
Impaired loans, with no related allowance, average recorded investment 1,640 1,704 $ 4,021
Impaired loans, with no related allowance, interest income, accrual method 11 28 34
Impaired loans, with related allowance, average recorded investment 795 2,290 7,987
Impaired loans, with related allowance, interest income, accrual method 8 77 313
Impaired loans, average recorded investment 2,435 3,994 12,008
Impaired loans, interest income, accrual method 19 105 347
Impaired loans, interest lost on nonaccrual loans 128 136 333
Commercial loan [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 164  
Impaired loans, with no related allowance, unpaid principal balance 0 310  
Impaired loans, with related allowance, recorded investment 142 292  
Impaired loans, with related allowance, unpaid principal balance 142 292  
Impaired loans, recorded investment 142 456  
Impaired loans, unpaid principal balance 142 602  
Impaired loans, related allowance 142 150  
Impaired loans, with no related allowance, average recorded investment 116 271 206
Impaired loans, with no related allowance, interest income, accrual method 0 0 9
Impaired loans, with related allowance, average recorded investment 204 544 3,468
Impaired loans, with related allowance, interest income, accrual method 2 11 85
Impaired loans, average recorded investment 320 815 3,674
Impaired loans, interest income, accrual method 2 11 94
Construction, land and land development [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 60 376  
Impaired loans, with no related allowance, unpaid principal balance 663 978  
Impaired loans, with related allowance, recorded investment 0 825  
Impaired loans, with related allowance, unpaid principal balance 0 825  
Impaired loans, recorded investment 60 1,201  
Impaired loans, unpaid principal balance 663 1,803  
Impaired loans, related allowance 0 200  
Impaired loans, with no related allowance, average recorded investment 259 397 1,475
Impaired loans, with no related allowance, interest income, accrual method 10 15 17
Impaired loans, with related allowance, average recorded investment 190 1,423 3,299
Impaired loans, with related allowance, interest income, accrual method 6 66 165
Impaired loans, average recorded investment 449 1,820 4,774
Impaired loans, interest income, accrual method 16 81 182
1-4 family residential first mortgages [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 352 257  
Impaired loans, with no related allowance, unpaid principal balance 360 257  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 352 257  
Impaired loans, unpaid principal balance 360 257  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 311 355 574
Impaired loans, with no related allowance, interest income, accrual method 1 7 1
Impaired loans, with related allowance, average recorded investment 0 144 183
Impaired loans, with related allowance, interest income, accrual method 0 0 8
Impaired loans, average recorded investment 311 499 757
Impaired loans, interest income, accrual method 1 7 9
Home equity [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 0  
Impaired loans, with no related allowance, unpaid principal balance 0 0  
Impaired loans, with related allowance, recorded investment 270 229  
Impaired loans, with related allowance, unpaid principal balance 270 229  
Impaired loans, recorded investment 270 229  
Impaired loans, unpaid principal balance 270 229  
Impaired loans, related allowance 270 229  
Impaired loans, with no related allowance, average recorded investment 0 7 2
Impaired loans, with no related allowance, interest income, accrual method 0 0 0
Impaired loans, with related allowance, average recorded investment 237 125 239
Impaired loans, with related allowance, interest income, accrual method 0 0 11
Impaired loans, average recorded investment 237 132 241
Impaired loans, interest income, accrual method 0 0 11
Commercial real estate [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 482 557  
Impaired loans, with no related allowance, unpaid principal balance 482 557  
Impaired loans, with related allowance, recorded investment 155 172  
Impaired loans, with related allowance, unpaid principal balance 155 172  
Impaired loans, recorded investment 637 729  
Impaired loans, unpaid principal balance 637 729  
Impaired loans, related allowance 155 172  
Impaired loans, with no related allowance, average recorded investment 952 674 1,759
Impaired loans, with no related allowance, interest income, accrual method 0 6 7
Impaired loans, with related allowance, average recorded investment 164 54 798
Impaired loans, with related allowance, interest income, accrual method 0 0 44
Impaired loans, average recorded investment 1,116 728 2,557
Impaired loans, interest income, accrual method 0 6 51
Consumer and other loans [Member]      
Loans, Impaired [Line Items]      
Impaired loans, with no related allowance, recorded investment 0 0  
Impaired loans, with no related allowance, unpaid principal balance 0 0  
Impaired loans, with related allowance, recorded investment 0 0  
Impaired loans, with related allowance, unpaid principal balance 0 0  
Impaired loans, recorded investment 0 0  
Impaired loans, unpaid principal balance 0 0  
Impaired loans, related allowance 0 0  
Impaired loans, with no related allowance, average recorded investment 2 0 5
Impaired loans, with no related allowance, interest income, accrual method 0 0 0
Impaired loans, with related allowance, average recorded investment 0 0 0
Impaired loans, with related allowance, interest income, accrual method 0 0 0
Impaired loans, average recorded investment 2 0 5
Impaired loans, interest income, accrual method $ 0 $ 0 $ 0