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Allowance for Credit Losses, Allocation of The Allowance For Loan Losses by Portfolio Segment and By Impairment Methodology (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Allowance for Credit Losses [Roll Forward]    
Beginning Balance $ 35,401 $ 34,274
Charge-Offs (96) (276)
Recoveries 5,468 228
Provision 750 1,175
Ending Balance 41,523 35,401
Ending Balance Individually Evaluated for Impairment 1,213 2,197
Ending Balance Collectively Evaluated for Impairment 40,310 33,204
Loans & Leases [Abstract]    
Ending Balance 1,996,359 1,712,244
Ending Balance Individually Evaluated for Impairment 12,044 33,584
Ending Balance Collectively Evaluated for Impairment 1,984,315 1,678,660
Commercial Real Estate [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 7,842 5,178
Charge-Offs 0 0
Recoveries 2,939 11
Provision (718) 2,653
Ending Balance 10,063 7,842
Ending Balance Individually Evaluated for Impairment 61 377
Ending Balance Collectively Evaluated for Impairment 10,002 7,465
Loans & Leases [Abstract]    
Ending Balance 603,650 491,903
Ending Balance Individually Evaluated for Impairment 3,420 20,066
Ending Balance Collectively Evaluated for Impairment 600,230 471,837
Agricultural Real Estate [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 4,185 3,576
Charge-Offs 0 0
Recoveries 0 0
Provision 2,696 609
Ending Balance 6,881 4,185
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 6,881 4,185
Loans & Leases [Abstract]    
Ending Balance 424,034 357,207
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 424,034 357,207
Real Estate Construction [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 1,669 654
Charge-Offs 0 0
Recoveries 2,225 0
Provision (1,409) 1,015
Ending Balance 2,485 1,669
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 2,485 1,669
Loans & Leases [Abstract]    
Ending Balance 151,974 96,519
Ending Balance Individually Evaluated for Impairment 0 4,386
Ending Balance Collectively Evaluated for Impairment 151,974 92,133
Residential 1st Mortgages [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 1,022 1,108
Charge-Offs 0 (73)
Recoveries 8 0
Provision (241) (13)
Ending Balance 789 1,022
Ending Balance Individually Evaluated for Impairment 69 422
Ending Balance Collectively Evaluated for Impairment 720 600
Loans & Leases [Abstract]    
Ending Balance 206,405 171,880
Ending Balance Individually Evaluated for Impairment 2,010 2,108
Ending Balance Collectively Evaluated for Impairment 204,395 169,772
Home Equity Lines and Loans [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 2,426 2,767
Charge-Offs 0 (70)
Recoveries 87 58
Provision (367) (329)
Ending Balance 2,146 2,426
Ending Balance Individually Evaluated for Impairment 35 329
Ending Balance Collectively Evaluated for Impairment 2,111 2,097
Loans & Leases [Abstract]    
Ending Balance 33,056 33,017
Ending Balance Individually Evaluated for Impairment 1,214 1,643
Ending Balance Collectively Evaluated for Impairment 31,842 31,374
Agricultural [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 6,104 12,205
Charge-Offs 0 0
Recoveries 4 8
Provision 200 (6,109)
Ending Balance 6,308 6,104
Ending Balance Individually Evaluated for Impairment 115 114
Ending Balance Collectively Evaluated for Impairment 6,193 5,990
Loans & Leases [Abstract]    
Ending Balance 293,966 281,963
Ending Balance Individually Evaluated for Impairment 606 461
Ending Balance Collectively Evaluated for Impairment 293,360 281,502
Commercial [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 8,195 5,697
Charge-Offs (12) (1)
Recoveries 136 86
Provision (483) 2,413
Ending Balance 7,836 8,195
Ending Balance Individually Evaluated for Impairment 905 914
Ending Balance Collectively Evaluated for Impairment 6,931 7,281
Loans & Leases [Abstract]    
Ending Balance 210,804 230,819
Ending Balance Individually Evaluated for Impairment 4,760 4,874
Ending Balance Collectively Evaluated for Impairment 206,044 225,945
Consumer & Other [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 218 176
Charge-Offs (84) (132)
Recoveries 69 65
Provision (28) 109
Ending Balance 175 218
Ending Balance Individually Evaluated for Impairment 28 41
Ending Balance Collectively Evaluated for Impairment 147 177
Loans & Leases [Abstract]    
Ending Balance 6,592 4,719
Ending Balance Individually Evaluated for Impairment 34 46
Ending Balance Collectively Evaluated for Impairment 6,558 4,673
Leases [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 2,211 639
Charge-Offs 0 0
Recoveries 0 0
Provision 1,083 1,572
Ending Balance 3,294 2,211
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 3,294 2,211
Loans & Leases [Abstract]    
Ending Balance 65,878 44,217
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 65,878 44,217
Unallocated [Member]    
Allowance for Credit Losses [Roll Forward]    
Beginning Balance 1,529 2,274
Charge-Offs 0 0
Recoveries 0 0
Provision 17 (745)
Ending Balance 1,546 1,529
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 1,546 1,529
Loans & Leases [Abstract]    
Ending Balance 0 0
Ending Balance Individually Evaluated for Impairment 0 0
Ending Balance Collectively Evaluated for Impairment 0 0
Restructured Loans [Member]    
Loans & Leases [Abstract]    
Ending Balance Individually Evaluated for Impairment $ 4,900 $ 26,400