Loans (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for Loans Losses [Roll Forward]
Beginning Balance	$ 36,641	$ 16,243	$ 16,278	$ 15,823
Provision for Loan Losses	5,900	250	11,050	925
Recoveries	90	144	218	290
Loans Charged-off	(200)	(398)	(768)	(799)
Ending Balance	42,431	16,239	42,431	16,239
Commercial and Industrial Loans and Leases
Allowance for Loans Losses [Roll Forward]
Beginning Balance		3,317	4,799	2,953
Provision for Loan Losses		(303)		44
Recoveries		34		51
Loans Charged-off		(56)		(56)
Ending Balance		2,992		2,992
Commercial Real Estate Loans
Allowance for Loans Losses [Roll Forward]
Beginning Balance	17,310	5,741	4,692	5,291
Provision for Loan Losses	5,049	104	10,215	669
Recoveries	10	14	14	19
Loans Charged-off	0	(18)	0	(138)
Ending Balance	22,369	5,841	22,369	5,841
Agricultural Loans
Allowance for Loans Losses [Roll Forward]
Beginning Balance	6,485	5,453	5,315	5,776
Provision for Loan Losses	545	272	149	(51)
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	7,030	5,725	7,030	5,725
Home Equity Loans
Allowance for Loans Losses [Roll Forward]
Beginning Balance	977	214	200	229
Provision for Loan Losses	85	54	65	39
Recoveries	0	0	0	0
Loans Charged-off	0	(10)	0	(10)
Ending Balance	1,062	258	1,062	258
Consumer Loans
Allowance for Loans Losses [Roll Forward]
Beginning Balance	455	483	434	420
Provision for Loan Losses	109	124	314	333
Recoveries	76	93	188	214
Loans Charged-off	(144)	(278)	(381)	(545)
Ending Balance	496	422	496	422
Residential Mortgage Loans
Allowance for Loans Losses [Roll Forward]
Beginning Balance	2,304	429	333	472
Provision for Loan Losses	87	(47)	316	(79)
Recoveries	0	3	1	6
Loans Charged-off	(31)	(36)	(31)	(50)
Ending Balance	2,360	349	2,360	349
Unallocated
Allowance for Loans Losses [Roll Forward]
Beginning Balance	0	606	505	682
Provision for Loan Losses	0	46	0	(30)
Recoveries	0	0	0	0
Loans Charged-off	0	0	0	0
Ending Balance	$ 0	$ 652	$ 0	$ 652