Loans (Schedule for Loans Individually Evaluated for Impairment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
With No Related Allowance Recorded:
Unpaid Principal Balance	[1]	$ 4,060		$ 4,060		$ 1,719
Recorded Investment		3,488		3,488		1,107
Average Recorded Investment		3,491	$ 2,507	2,173	$ 2,534
Interest Income Recognized		26	48	82	99
Cash Basis Recognized		0	48	47	64
With An Allowance Recorded:
Unpaid Principal Balance	[1]	6,848		6,848		1,575
Recorded Investment		6,801		6,801		1,431
Allowance for Loan Losses Allocated		1,849		1,849		355
Average Recorded Investment		6,747	1,702	3,785	2,117
Interest Income Recognized		5	0	17	2
Cash Basis Recognized		1	0	8	0
Unpaid Principal Balance	[1]	10,908		10,908		3,294
Recorded Investment		10,289		10,289		2,538
Average Recorded Investment		10,238	4,209	5,958	4,651
Interest Income Recognized		31	48	99	101
Cash Basis Recognized		1	48	55	64
Receivables Acquired with Deteriorated Credit Quality
With No Related Allowance Recorded:
Unpaid Principal Balance	[1]	1,273		1,273		1,018
Recorded Investment		788		788		531
Average Recorded Investment		771	1,362	826	1,060
Interest Income Recognized		0	1	25	14
Cash Basis Recognized		0	1	25	4
With An Allowance Recorded:
Unpaid Principal Balance	[1]	257		257		910
Recorded Investment		212		212		768
Allowance for Loan Losses Allocated		6		6		100
Average Recorded Investment		215	498	255	430
Interest Income Recognized		4	0	15	0
Cash Basis Recognized		0	0	7	0
Commercial and Industrial Loans and Leases
With No Related Allowance Recorded:
Unpaid Principal Balance	[1]	1,223		1,223		85
Recorded Investment		1,182		1,182		29
Average Recorded Investment		1,202	129	456	131
Interest Income Recognized		13	1	15	26
Cash Basis Recognized		0	1	2	12
With An Allowance Recorded:
Unpaid Principal Balance	[1]	3,000		3,000		148
Recorded Investment		2,959		2,959		107
Allowance for Loan Losses Allocated		326		326		27
Average Recorded Investment		2,865	106	1,011	107
Interest Income Recognized		2	0	4	0
Cash Basis Recognized		1	0	2	0
Commercial Real Estate Loans
With No Related Allowance Recorded:
Unpaid Principal Balance	[1]	1,916		1,916		1,278
Recorded Investment		1,573		1,573		784
Average Recorded Investment		1,554	2,066	1,067	2,014
Interest Income Recognized		13	47	43	71
Cash Basis Recognized		0	47	29	51
With An Allowance Recorded:
Unpaid Principal Balance	[1]	3,620		3,620		839
Recorded Investment		3,614		3,614		827
Allowance for Loan Losses Allocated		1,453		1,453		280
Average Recorded Investment		3,654	1,098	2,290	1,844
Interest Income Recognized		3	0	13	2
Cash Basis Recognized		0	0	6	0
Agricultural Loans
With No Related Allowance Recorded:
Unpaid Principal Balance	[1]	921		921		356
Recorded Investment		733		733		294
Average Recorded Investment		735	312	650	389
Interest Income Recognized		0	0	24	2
Cash Basis Recognized		0	0	16	1
With An Allowance Recorded:
Unpaid Principal Balance	[1]	228		228		588
Recorded Investment		228		228		497
Allowance for Loan Losses Allocated		70		70		$ 48
Average Recorded Investment		228	498	484	166
Interest Income Recognized		0	0	0	0
Cash Basis Recognized		$ 0	$ 0	$ 0	$ 0

[1] Unpaid Principal Balance is the remaining contractual principal payments gross of partial charge-offs and discounts.