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Loans and Allowance for Credit Losses - Schedule of Collateral-Dependent Non-Accrual Loans (Details) - USD ($)	Dec. 31, 2021		Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 8,376,000			$ 9,233,000
Allowance for credit losses on loans	$ 23,023,000	[1]	$ 22,113,000	$ 22,874,000	[1]
Weighted average ratio of loans value to collateral dependent loans value	67.00%			56.00%
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 8,376,000			$ 17,609,000
Allowance for credit losses on loans	0			0
Nonaccrual collateral dependent loans in process of foreclosure	0			0
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,963,000			16,720,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	413,000			872,000
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			17,000
Commercial real estate | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,269,000			7,147,000
Allowance for credit losses on loans	2,776,000		3,135,000	2,778,000
Commercial real estate | Commercial real estate, owner-occupied | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,269,000			7,147,000
Allowance for credit losses on loans	0			0
Commercial real estate | Commercial real estate, owner-occupied | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	7,269,000			7,147,000
Commercial real estate | Commercial real estate, owner-occupied | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Commercial real estate | Commercial real estate, owner-occupied | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Commercial real estate | Commercial real estate, investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	694,000			1,610,000
Allowance for credit losses on loans	12,739,000		11,624,000	12,682,000
Commercial real estate | Commercial real estate, investor-owned | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	694,000			1,610,000
Allowance for credit losses on loans	0			0
Commercial real estate | Commercial real estate, investor-owned | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	694,000			1,610,000
Commercial real estate | Commercial real estate, investor-owned | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Commercial real estate | Commercial real estate, investor-owned | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	413,000			459,000
Allowance for credit losses on loans	595,000		1,038,000	738,000
Residential loans | Home equity | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	413,000			459,000
Allowance for credit losses on loans	0			0
Residential loans | Home equity | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Residential loans | Home equity | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	413,000			459,000
Residential loans | Home equity | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			0
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	0			17,000
Allowance for credit losses on loans	$ 621,000		$ 406,000	291,000
Consumer loans | Installment and other consumer | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans				17,000
Allowance for credit losses on loans				0
Consumer loans | Installment and other consumer | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans				0
Consumer loans | Installment and other consumer | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans				0
Consumer loans | Installment and other consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans				$ 17,000
[1] Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.

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