Borrowed Funds (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Debt Disclosure [Abstract]
Interest rate swaps, notional amount	$ 365,000		$ 365,000
FHLB advances, variable rate	$ 365,000		$ 365,000
Interest rate swaps, remaining term to maturity	3 years 9 months 18 days		4 years 1 month 6 days
Interest rate swaps, fair value	$ (22,500)		$ (27,700)
Interest rate swaps, amount reclassified from AOCI	1,783	$ 2,970
Interest rate swaps, future amount to be reclassified from AOCI	8,000
Interest rate swaps, collateral posted	$ 23,100		$ 28,000