Recent Accounting Pronouncements (Impact of ASC 326 in Balance Sheet as January 1, 2020) (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ 3,225,232		$ 3,081,973
Allowance for Credit Losses	$ (31,931)	(46,768)	$ (42,431)	(16,278)	$ (15,869)	$ (16,239)	$ (15,823)
Allowance for Credit Losses on Unfunded Loan Commitments	(173)
Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				3,081,973
Allowance for Credit Losses				(16,278)
Allowance for Credit Losses on Unfunded Loan Commitments				0
Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				0
Allowance for Credit Losses	(15,653)
Allowance for Credit Losses on Unfunded Loan Commitments	(173)
Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	534,692	781,547		589,758
Allowance for Credit Losses		(7,700)	(8,787)	(4,799)
Commercial and Industrial Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				532,501
Commercial and Industrial Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	2,191			(57,257)
Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	1,500,247	1,453,280		1,495,862
Allowance for Credit Losses		(28,382)	(22,369)	(4,692)	(4,300)	(5,841)	(5,291)
Commercial Real Estate Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				1,495,862
Commercial Real Estate Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	4,385
Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	384,654	376,215		384,526
Allowance for Credit Losses		(6,715)	(7,030)	(5,315)	(5,352)	(5,725)	(5,776)
Agricultural Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				384,526
Agricultural Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	128
Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	57,257	57,475
Allowance for Credit Losses		(206)	(202)	0
Leases | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				57,257
Leases | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	0			57,257
Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	225,790	218,640		225,755
Allowance for Credit Losses		(995)	(1,062)	(200)	(194)	(258)	(229)
Home Equity Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				225,755
Home Equity Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	35
Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	69,264	64,919		81,217
Allowance for Credit Losses		(492)	(496)	(434)	(418)	(422)	(420)
Consumer Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				69,264
Consumer Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	0			(11,953)
Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	11,953	10,717
Allowance for Credit Losses		(137)	(125)	0
Credit Cards | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				11,953
Credit Cards | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	0			11,953
Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	305,002	262,439		304,855
Allowance for Credit Losses		$ (2,141)	$ (2,360)	(333)	$ (362)	$ (349)	$ (472)
Residential Mortgage Loans | Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				$ 304,855
Residential Mortgage Loans | Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 147