Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loans with no related allowance recorded:
Recorded Investment	$ 808	$ 955
Unpaid Principal Balance	1,145	1,151
Average Recorded Investment	456	409
Interest Income Recognized	4	14
Cash Basis Interest Recognized	4	16
Loans with an allowance recorded:
Recorded Investment	8,050	1,932
Unpaid Principal Balance	8,049	1,931
Related Allowance	2,542	1,133
Average Recorded Investment	3,676	3,227
Interest Income Recognized	76	67
Cash Basis Interest Recognized	48	63
Recorded Investment, Total	8,858	2,887
Unpaid Principal Balance, Total	9,194	3,082
Average Recorded Investment, Total	4,132	3,636
Interest Income Recognized, Total	80	81
Cash Basis Interest Recognized, Total	52	79
Commercial Loan Portfolio | Commercial - Closed-End
Loans with no related allowance recorded:
Recorded Investment	10	0
Unpaid Principal Balance	10	0
Average Recorded Investment	3	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	150	175
Unpaid Principal Balance	150	175
Related Allowance	104	110
Average Recorded Investment	123	135
Interest Income Recognized	0	4
Cash Basis Interest Recognized	0	4
Commercial Loan Portfolio | Commercial - Lines of Credit
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	814	423
Unpaid Principal Balance	814	422
Related Allowance	620	383
Average Recorded Investment	484	293
Interest Income Recognized	4	26
Cash Basis Interest Recognized	3	25
Commercial Loan Portfolio | Agriculture & AG RE
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	85
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	80
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Commercial Loan Portfolio | Construction, Land & Development
Loans with no related allowance recorded:
Recorded Investment	32	57
Unpaid Principal Balance	209	235
Average Recorded Investment	28	19
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	72	72
Unpaid Principal Balance	72	72
Related Allowance	59	60
Average Recorded Investment	70	84
Interest Income Recognized	1	4
Cash Basis Interest Recognized	0	1
Commercial Loan Portfolio | Commercial Real Estate - Owner-Occupied
Loans with no related allowance recorded:
Recorded Investment	133	134
Unpaid Principal Balance	275	134
Average Recorded Investment	41	9
Interest Income Recognized	3	7
Cash Basis Interest Recognized	3	9
Loans with an allowance recorded:
Recorded Investment	16	17
Unpaid Principal Balance	16	17
Related Allowance	16	17
Average Recorded Investment	217	313
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Commercial Loan Portfolio | Commercial Real Estate - Non-Owner Occupied
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	3,081	300
Unpaid Principal Balance	3,080	300
Related Allowance	559	75
Average Recorded Investment	989	1,110
Interest Income Recognized	36	0
Cash Basis Interest Recognized	22	0
Retail Residential Loan Portfolio | Residential 1-4 Family - Senior Lien
Loans with an allowance recorded:
Related Allowance	1,005	298
Retail Residential Loan Portfolio | Residential 1-4 Family - Senior Lien | Senior Lien
Loans with no related allowance recorded:
Recorded Investment	363	331
Unpaid Principal Balance	381	349
Average Recorded Investment	218	180
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	3,640	629
Unpaid Principal Balance	3,640	629
Average Recorded Investment	1,463	862
Interest Income Recognized	32	19
Cash Basis Interest Recognized	20	19
Retail Residential Loan Portfolio | Residential 1-4 Family - Jr. Lien & Lines of Credit
Loans with an allowance recorded:
Related Allowance	179	190
Retail Residential Loan Portfolio | Residential 1-4 Family - Jr. Lien & Lines of Credit | Jr. Lien & Lines of Credit
Loans with no related allowance recorded:
Recorded Investment	270	433
Unpaid Principal Balance	270	433
Average Recorded Investment	166	116
Interest Income Recognized	1	7
Cash Basis Interest Recognized	1	7
Loans with an allowance recorded:
Recorded Investment	277	316
Unpaid Principal Balance	277	316
Average Recorded Investment	330	349
Interest Income Recognized	3	14
Cash Basis Interest Recognized	3	14
Retail Residential Loan Portfolio | Consumer
Loans with no related allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	0
Loans with an allowance recorded:
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	1
Interest Income Recognized	0	0
Cash Basis Interest Recognized	$ 0	$ 0