Loans - Loans Receivable, Impaired, Interest Income, Cash Basis Method (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 42,291
Interest Income Recognized	738
Cash Basis Income Recognized	629
Residential Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	4,552
Interest Income Recognized	64
Cash Basis Income Recognized	60
Residential Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	2,080
Interest Income Recognized	30
Cash Basis Income Recognized	32
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	6,632
Interest Income Recognized	94
Cash Basis Income Recognized	92
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	7,365
Interest Income Recognized	166
Cash Basis Income Recognized	132
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	1,989
Interest Income Recognized	33
Cash Basis Income Recognized	26
Multi-Family Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	1,332
Interest Income Recognized	20
Cash Basis Income Recognized	20
Agriculture Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	12,903
Interest Income Recognized	206
Cash Basis Income Recognized	197
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	24,743
Interest Income Recognized	459
Cash Basis Income Recognized	408
Commercial Working Capital [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	8,089
Interest Income Recognized	143
Cash Basis Income Recognized	91
Commercial Loans Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	1,870
Interest Income Recognized	27
Cash Basis Income Recognized	24
Home Equity and Improvement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	921
Interest Income Recognized	14
Cash Basis Income Recognized	13
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	9,959
Interest Income Recognized	170
Cash Basis Income Recognized	115
Consumer Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	36
Interest Income Recognized	1
Cash Basis Income Recognized	1
Commercial Real Estate Other Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	1,154
Interest Income Recognized	34
Cash Basis Income Recognized	$ 33