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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Apr. 28, 2020
Composition of Borrowed Funds
Borrowed funds	$ 404,162,000	$ 429,229,000
Borrowed funds, average balance	$ 425,458,000	$ 429,624,000
Borrowed funds, interest rate during period	1.84%	1.91%
Federal funds purchased
Composition of Borrowed Funds
Borrowed funds	$ 0	$ 0
Borrowed funds, average balance	$ 0	$ 71,000
Borrowed funds, interest rate during period	0.00%	0.69%
Federal Reserve PPPLF
Composition of Borrowed Funds
Borrowed funds	$ 0	$ 0	$ 29,600,000
Borrowed funds, average balance	$ 0	$ 15,207,000
Borrowed funds, interest rate during period	0.00%	0.35%
FHLB advances
Composition of Borrowed Funds
Borrowed funds	$ 357,800,000	$ 394,500,000
Borrowed funds, average balance	$ 384,581,000	$ 379,891,000
Borrowed funds, interest rate during period	1.30%	1.45%
Line of Credit
Composition of Borrowed Funds
Borrowed funds	$ 0	$ 0
Borrowed funds, average balance	$ 100,000	$ 0
Borrowed funds, interest rate during period	2.89%	0.00%
Other borrowings
Composition of Borrowed Funds
Borrowed funds	$ 12,512,000	$ 920,000
Borrowed funds, average balance	$ 6,950,000	$ 676,000
Borrowed funds, interest rate during period	4.28%	12.60%
Subordinated notes payable
Composition of Borrowed Funds
Borrowed funds	$ 23,778,000	$ 23,747,000
Borrowed funds, average balance	$ 23,761,000	$ 23,725,000
Borrowed funds, interest rate during period	5.94%	5.95%
Junior subordinated notes
Composition of Borrowed Funds
Borrowed funds	$ 10,072,000	$ 10,062,000
Borrowed funds, average balance	$ 10,066,000	$ 10,054,000
Borrowed funds, interest rate during period	11.02%	11.09%

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