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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract Loans	Sep. 30, 2020 contract	Sep. 30, 2021 USD ($) Loans contract	Sep. 30, 2020 contract	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 8,463,000		$ 8,463,000			$ 7,908,000
Reserves specific to modified loans	$ 678,000		$ 678,000			$ 20,000
Number of loans | Loans	2
Defaults on troubled debt restructurings | contract	0	0	0	0
COVID-19 [Member] | Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 335,950		$ 335,950
Commercial Real Estate | Commercial real estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 305,000		305,000
Number of loans | Loans	1
Pre-Modification Outstanding Recorded Investment	$ 333,000
Principal Modification	0
Post Modification Outstanding Recorded Investment	333,000
Commercial Real Estate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 2,489,000		$ 2,489,000		$ 7,175,000
Number of loans | Loans	1		1
Pre-Modification Outstanding Recorded Investment	$ 2,989,000		$ 12,925,000
Principal Modification	0		0
Post Modification Outstanding Recorded Investment	2,489,000		$ 12,925,000
Commercial Real Estate | Agricultural production
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment					779,000
Number of loans | Loans			1
Pre-Modification Outstanding Recorded Investment			$ 850,000
Principal Modification			0
Post Modification Outstanding Recorded Investment			850,000
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	2,489,000		$ 2,489,000
Number of loans | Loans			1
Pre-Modification Outstanding Recorded Investment			$ 2,989,000
Principal Modification			0
Post Modification Outstanding Recorded Investment			2,489,000
Consumer
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	2,794,000		$ 2,794,000
Number of loans | Loans			2
Pre-Modification Outstanding Recorded Investment			$ 3,322,000
Principal Modification			0
Post Modification Outstanding Recorded Investment			2,822,000
Commercial and Real Estate
Financing Receivable, Modifications [Line Items]
Outstanding Recorded Investment	$ 2,489,000		$ 2,489,000		$ 7,954,000
Number of loans | Loans	1		2
Pre-Modification Outstanding Recorded Investment	$ 2,989,000		$ 13,775,000
Principal Modification	0		0
Post Modification Outstanding Recorded Investment	$ 2,489,000		$ 13,775,000

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