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Debt (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Maturity of federal funds purchased from correspondent banks		one business day
Real estate secured loans		$ 1,337,974,000
Current borrowing available		497,748,000
Maximum borrowing capacity		933,422,000
Short term borrowings				$ 125,617,000
Long-term debt outstanding		74,858,000		75,115,000
FHLB prepayment	$ 22,500,000		$ 22,500,000
FHLB prepayment penalties	$ 26,000		$ 165,000
FHLB [Member]
Debt Instrument [Line Items]
Letter of credit outstanding, amount		362,520,000		288,950,000
Paycheck Protection Program Liquidity Facility [Member]
Debt Instrument [Line Items]
Short term borrowings		$ 0		125,617,000
Short-term borrowings, term		five years
Short-term borrowings, interest Rate		0.35%
Other Correspondent Banks [Member]
Debt Instrument [Line Items]
Outstanding drawings		$ 0		0
Line of credit facility, remaining borrowing capacity		35,000,000
Short term borrowings		0		0
FHLB Short-Term Borrowings [Member]
Debt Instrument [Line Items]
Outstanding drawings		$ 0		$ 0

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Amount of drawings outstanding on short-term borrowings.

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Federal home loan bank advances penalties.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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