Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Dec. 31, 2020
Securities Sold under Agreements to Repurchase [Abstract]
Gross Amounts Recognized		$ 219,484	$ 271,081
Gross Amounts Offset in the Statement of Financial Position		0	0
Net Amounts of Liabilities presented in the Statement of Financial Position		219,484	271,081
Financial Instruments		0	0
Fair Value Collateral Posted		219,484	271,081
Net Amount		0	0
Fair value of derivatives in a net liability position		22,200
Posted collateral		20,500
Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Asset derivatives (other assets), fair value		17,442	28,703
Liability derivatives (other liabilities), fair value		21,428	34,967
Derivative Asset [Abstract]
Gross Amounts Offset in the Statement of Financial Position		0	0
Derivative financial instruments		17,442	28,703
Financial Instruments		633	2
Fair Value Collateral Posted		0	0
Net Amount		16,809	28,701
Derivative Liability [Abstract]
Gross Amounts Offset in the Statement of Financial Position		0	0
Net Amounts of Liabilities presented in the Statement of Financial Position		21,428	34,967
Financial Instruments		633	2
Fair Value Collateral Posted		20,519	34,903
Net Amount		276	62
Derivatives Designated as Hedging Instruments: | Other Assets [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		61,962	61,962
Asset derivatives (other assets), fair value		0	0
Derivatives Designated as Hedging Instruments: | Other Liabilities [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value		3,971	5,987
Derivatives not Designated as Hedging Instruments: | Other Assets [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		932,666	1,026,016
Asset derivatives (other assets), fair value		17,442	28,703
Derivatives not Designated as Hedging Instruments: | Other Liabilities [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value		$ 17,457	$ 28,980
Cash Flow Hedging | Cash Flow Hedge 1
Derivative [Line Items]
Derivative, fixed rate		2.60%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		$ 15,465
Cash Flow Hedging | Cash Flow Hedge 2
Derivative [Line Items]
Derivative, fixed rate		2.60%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		$ 14,433
Cash Flow Hedging | Cash Flow Hedge 3
Derivative [Line Items]
Derivative, fixed rate		2.64%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		$ 18,558
Cash Flow Hedging | Cash Flow Hedge 4
Derivative [Line Items]
Derivative, fixed rate		2.64%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		$ 13,506
Cash Flow Hedging | Subordinated Debt [Member]
Derivative [Line Items]
Derivative, Variable Interest Rate		2.62%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount		$ 62,000
Scenario, Forecast | Cash Flow Hedging
Derivative [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	$ 1,500