LOANS, Non-accrual and Past Due Loans (Details) $ in Thousands	Jun. 30, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Jun. 30, 2016 USD ($)
Non-accrual and Past Due Loans [Abstract]
Current & accruing	$ 680,030	$ 672,621
Nonaccrual	3,027	6,297
Total	685,764	679,563	$ 642,689
Commitments to lend additional funds to borrowers whose loans were on non-accrual status	0
30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	1,849	484
60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	858	161
90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	$ 0	$ 0
Commercial [Member]
Non-accrual and Past Due Loans [Abstract]
Number of nonaccrual loans | Loan	1	1
Current & accruing	$ 119,766	$ 121,311
Nonaccrual	2,400	5,000
Total	122,803	126,311	132,347
Commercial [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	535	0
Commercial [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	102	0
Commercial [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	$ 0	$ 0
Commercial Real Estate [Member]
Non-accrual and Past Due Loans [Abstract]
Number of nonaccrual loans | Loan	2	2
Current & accruing	$ 353,805	$ 343,186
Nonaccrual	500	540
Total	355,060	344,210	313,533
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	484
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	755	0
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Agriculture [Member]
Non-accrual and Past Due Loans [Abstract]
Current & accruing	101,340	101,905
Nonaccrual	0	0
Total	101,340	101,905	92,766
Agriculture [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Agriculture [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Agriculture [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	$ 0	$ 0
Residential Mortgage [Member]
Non-accrual and Past Due Loans [Abstract]
Number of nonaccrual loans | Loan	2	3
Current & accruing	$ 41,220	$ 39,463
Nonaccrual	127	654
Total	41,347	40,237	43,670
Residential Mortgage [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Residential Mortgage [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	120
Residential Mortgage [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Residential Construction [Member]
Non-accrual and Past Due Loans [Abstract]
Current & accruing	24,387	23,650
Nonaccrual	0	0
Total	24,802	23,650	17,554
Residential Construction [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	415	0
Residential Construction [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	0
Residential Construction [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	0	$ 0
Consumer [Member]
Non-accrual and Past Due Loans [Abstract]
Number of nonaccrual loans | Loan		1
Current & accruing	39,512	$ 43,106
Nonaccrual	0	103
Total	40,412	43,250	$ 42,819
Consumer [Member] | 30-59 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	899	0
Consumer [Member] | 60-89 Days Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	1	41
Consumer [Member] | 90 Days or More Past Due [Member]
Non-accrual and Past Due Loans [Abstract]
Past due & accruing	$ 0	$ 0