Derivative Financial Instruments, Agency Business (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Derivative Financial Instruments
Net (losses) gains from changes in the fair value of derivatives	$ 800	$ 3,400	$ (7,800)
(Loss) gain on derivative instruments	(2,684)	(58,335)	(1,962)
Realized gain (loss) on derivatives	100
Unrealized gain (loss) on derivatives	1,500
Notional Value, classified in Other Assets	280,654	865,975
Other Income
Derivative Financial Instruments
(Loss) gain on derivative instruments	130,200	165,500	$ 90,800
Rate lock commitments
Derivative Financial Instruments
Notional value	11,250
Forward Sale Commitments
Derivative Financial Instruments
Notional value	$ 571,220
Interest Rate Swaps
Derivative Financial Instruments
Derivative, maturity term	3 months
Derivative swap default credit.	5 years
Interest Rate Swaps | Minimum
Derivative Financial Instruments
Derivative Swap Rate Period	5 years
Interest Rate Swaps | Maximum
Derivative Financial Instruments
Derivative Swap Rate Period	10 years
Interest Rate Swaps | Agency Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	$ (57,100)	4,600
Unrealized gain (loss) on derivatives	(1,700)	1,500
Interest Rate Swaps | Structured Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	(3,000)	(400)
Unrealized gain (loss) on derivatives	200	200
Non-Qualifying | Agency Business
Derivative Financial Instruments
Fair Value, classified in Other Assets	1,665	3,892
Fair Value, classified in Other Liabilities	(1,482)	(1,221)
Notional Value, classified in Other Assets	$ 970,670	$ 1,230,417
Non-Qualifying | Rate lock commitments | Agency Business
Derivative Financial Instruments
Count | item	2	7
Fair Value, classified in Other Assets	$ 295	$ 1,967
Fair Value, classified in Other Liabilities	(33)	(231)
Notional Value, classified in Other Assets	$ 11,250	$ 136,354
Non-Qualifying | Forward Sale Commitments | Agency Business
Derivative Financial Instruments
Count | item	55	114
Fair Value, classified in Other Assets	$ 1,370	$ 1,925
Fair Value, classified in Other Liabilities	(1,449)	(990)
Notional Value, classified in Other Assets	$ 571,220	$ 1,048,763
Non-Qualifying | Interest Rate Swaps | Agency Business
Derivative Financial Instruments
Count | item	3,882	453
Notional Value, classified in Other Assets	$ 388,200	$ 45,300