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Accounting Policies (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 63,628,000	$ 65,022,000		$ 52,388,000	$ 49,226,000	$ 42,342,000	$ 21,398,000
Shareholders' equity	(929,750,000)	(904,510,000)		(893,421,000)	(880,818,000)	(867,891,000)	(852,401,000)
Accrued interest receivable on held to maturity debt securities	2,000,000
Allowance for credit losses on available-for-sale portfolio	0
Accrued interest receivable on available for sale debt securities	4,000,000
Accrued interest on loans	13,400,000
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shareholders' equity	(529,474,000)	$ (507,531,000)		(478,489,000)	$ (459,988,000)	$ (441,846,000)	$ (417,764,000)
Unfunded Loan Commitment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses	$ 11,074,000			582,000
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 14,600,000	14,575,000
Shareholders' equity				17,051,000
Cumulative Effect, Period Of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shareholders' equity			17,100,000
Cumulative Effect, Period Of Adoption, Adjustment | Unfunded Loan Commitment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			7,500,000	$ 7,504,000
Cumulative Effect, Period Of Adoption, Adjustment | PCI Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 100,000

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