Loans and Leases - Allowance for Credit Losses - Roll Forward (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 9,750	$ 9,043	$ 9,701
Charge-offs		(4,873)	(5,308)	(3,085)
Recoveries		2,496	1,665	3,567
Provision		2,550	4,350	(1,140)
Ending balance		9,923	9,750	9,043
Unallocated [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		30	46	457
Charge-offs		0	0	0
Recoveries		0	0	0
Provision		102	(16)	(411)
Ending balance		132	30	46
Real Estate Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5,831	4,786	3,548
Charge-offs		(1,190)	(2,474)	(101)
Recoveries		647	374	2,235
Provision		347	3,145	(896)
Ending balance		5,635	5,831	4,786
Agricultural Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		256	208	209
Charge-offs		0	0	(154)
Recoveries		0	23	5
Provision		(63)	25	148
Ending balance		193	256	208
Commercial and Industrial and Mortgage Warehouse Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	[1]	2,394	2,772	4,279
Charge-offs	[1]	(1,274)	(608)	(669)
Recoveries	[1]	690	148	310
Provision	[1]	875	82	(1,148)
Ending balance	[1]	2,685	2,394	2,772
Consumer Loans Sector [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1,239	1,231	1,208
Charge-offs		(2,409)	(2,226)	(2,161)
Recoveries		1,159	1,120	1,017
Provision		1,289	1,114	1,167
Ending balance		$ 1,278	$ 1,239	$ 1,231

[1] Includes mortgage warehouse lines