Loans, Allowance for Credit Losses and Credit Quality TDR on Financing Receivables Post Modification (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 827,000	[1]	$ 18,301,000	[1]	$ 3,639,000	[1]
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification						3,639,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default		0		3,200,000		0
Contractual Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	218,000		0		822,000
Court ordered concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	0		0		25,000
Extended Maturity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	609,000		4,153,000		2,792,000
Combination rate and maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0		$ 14,148,000		$ 0

[1] The pre-modification and post-modification balances represent the legal principal balance of the loan. Activity presented in the tables above includes no modifications on existing TDRs during the three months ended September 30, 2021, $14.3 million of modifications on existing TDRs during the nine months ended September 30, 2021, and $83,000 and $1.5 million of modifications on existing TDRs during the three and nine months ended September 30, 2020, respectively.