Derivatives and Hedging Activities (Narrative) (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) counterparty instrument	Dec. 31, 2021 USD ($) instrument
Derivative [Line Items]
Amount of collateral	$ 4,630,000	$ 26,566,000
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	4,900,000
Notional amount	$ 500,000,000
Number of counterparties | counterparty	4
Counterparty in liability position | counterparty	1
Derivative liability, termination value	$ 5,600,000
Collateral against obligations	4,800,000
Derivatives Not Designated as a Hedging Instruments
Derivative [Line Items]
Credit derivatives, fair value	$ 77,700	$ 108,800
Derivatives Not Designated as a Hedging Instruments | Interest rate products
Derivative [Line Items]
Number of derivative instruments held | instrument	166	166
Derivative notional amount	$ 2,430,000,000	$ 2,420,000,000
Derivatives Not Designated as a Hedging Instruments | Credit contracts
Derivative [Line Items]
Number of derivative instruments held | instrument	13	13
Derivative notional amount	$ 147,200,000	$ 144,800,000
Amount of collateral	$ 70,000
Designated as Hedging Instrument
Derivative [Line Items]
Number of outstanding derivatives | instrument	13