Loans, Loans Portfolio by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	$ 1,162,325	$ 849,060
Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	78,055	36,103
Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	704,535	527,596
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	348,324	252,049
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	17,616	17,563
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	13,297	15,210
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	498	539
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	1,134,641	824,849
Pass [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	74,748	35,683
Pass [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	683,230	506,833
Pass [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	345,478	250,039
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	17,567	17,522
Pass [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	13,120	14,233
Pass [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	498	539
OAEM [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	2,966	2,356
OAEM [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	1,417	176
OAEM [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	1,549	2,180
OAEM [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
OAEM [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
OAEM [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
OAEM [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	24,718	21,855
Substandard [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	1,890	244
Substandard [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	19,756	18,583
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	2,846	2,010
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	49	41
Substandard [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	177	977
Substandard [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	$ 0	$ 0