Loans, Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Recorded Investment
With no related allowance recorded	$ 14,891		$ 14,891		$ 26,840
With an allowance recorded	3,503		3,503		1,102
Total	18,394		18,394		27,942
Unpaid Principal Balance
With no related allowance recorded	17,003		17,003		29,445
With an allowance recorded	3,510		3,510		1,126
Total	20,513		20,513		30,571
Related Allowance
With an allowance recorded	381		381		62
Average Recorded Investment
With no related allowance recorded	16,285	$ 23,179	18,815	$ 21,117
With an allowance recorded	3,518	1,024	3,562	1,038
Total	19,803	24,203	22,377	22,155
Interest Income Recognized
With no related allowance recorded	360	392	995	920
With an allowance recorded	29	15	93	46
Total	389	407	1,088	966
Cash basis interest expense on impaired loans			47,000	85,000
Commercial and industrial [Member]
Recorded Investment
With no related allowance recorded	817		817		926
With an allowance recorded	239		239		264
Total	1,056		1,056		1,190
Unpaid Principal Balance
With no related allowance recorded	1,358		1,358		1,457
With an allowance recorded	245		245		269
Total	1,603		1,603		1,726
Related Allowance
With an allowance recorded	7		7		10
Average Recorded Investment
With no related allowance recorded	960	1,261	866	950
With an allowance recorded	244	276	253	283
Total	1,204	1,537	1,119	1,233
Interest Income Recognized
With no related allowance recorded	11	35	20	56
With an allowance recorded	4	4	11	13
Total	15	39	31	69
Commercial, secured by real estate [Member]
Recorded Investment
With no related allowance recorded	10,186		10,186		21,266
With an allowance recorded	2,496		2,496		150
Total	12,682		12,682		21,416
Unpaid Principal Balance
With no related allowance recorded	11,065		11,065		22,451
With an allowance recorded	2,496		2,496		150
Total	13,561		13,561		22,601
Related Allowance
With an allowance recorded	346		346		3
Average Recorded Investment
With no related allowance recorded	11,409	17,364	13,891	16,143
With an allowance recorded	2,514	152	2,563	154
Total	13,923	17,516	16,454	16,297
Interest Income Recognized
With no related allowance recorded	290	269	787	657
With an allowance recorded	13	3	47	9
Total	303	272	834	666
Residential real estate [Member]
Recorded Investment
With no related allowance recorded	3,569		3,569		4,122
With an allowance recorded	750		750		665
Total	4,319		4,319		4,787
Unpaid Principal Balance
With no related allowance recorded	4,135		4,135		4,872
With an allowance recorded	751		751		684
Total	4,886		4,886		5,556
Related Allowance
With an allowance recorded	28		28		49
Average Recorded Investment
With no related allowance recorded	3,600	3,935	3,724	3,420
With an allowance recorded	741	573	725	577
Total	4,341	4,508	4,449	3,997
Interest Income Recognized
With no related allowance recorded	51	77	161	174
With an allowance recorded	12	8	34	23
Total	63	85	195	197
Consumer [Member]
Recorded Investment
With no related allowance recorded	11		11		13
With an allowance recorded	18		18		23
Total	29		29		36
Unpaid Principal Balance
With no related allowance recorded	11		11		13
With an allowance recorded	18		18		23
Total	29		29		36
Related Allowance
With an allowance recorded	0		0		0
Average Recorded Investment
With no related allowance recorded	12	68	12	37
With an allowance recorded	19	23	21	24
Total	31	91	33	61
Interest Income Recognized
With no related allowance recorded	0	1	1	2
With an allowance recorded	0	0	1	1
Total	0	1	2	3
Agricultural [Member]
Recorded Investment
With no related allowance recorded	0		0		177
With an allowance recorded	0		0		0
Total	0		0		177
Unpaid Principal Balance
With no related allowance recorded	0		0		177
With an allowance recorded	0		0		0
Total	0		0		177
Related Allowance
With an allowance recorded	0		0		0
Average Recorded Investment
With no related allowance recorded	0	177	0	177
With an allowance recorded	0	0	0	0
Total	0	177	0	177
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Total	0	0	0	0
Other [Member]
Recorded Investment
With no related allowance recorded	308		308		336
With an allowance recorded	0		0		0
Total	308		308		336
Unpaid Principal Balance
With no related allowance recorded	434		434		475
With an allowance recorded	0		0		0
Total	434		434		475
Related Allowance
With an allowance recorded	0		0		$ 0
Average Recorded Investment
With no related allowance recorded	304	374	322	390
With an allowance recorded	0	0	0	0
Total	304	374	322	390
Interest Income Recognized
With no related allowance recorded	8	10	26	31
With an allowance recorded	0	0	0	0
Total	$ 8	$ 10	$ 26	$ 31