Offsetting of Financial Assets and Liabilities - Derivative Instruments and Short-term Borrowing Arrangements, including those Subject to Master Netting or Similar Arrangements (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Derivative instruments:
Derivative Asset, Gross Amount Recognized		$ 4,422	$ 250
Derivative Asset, Amount Offset		0	0
Derivative Asset		4,422	250
Derivative Asset, Financial Instruments	[1]	(139)	(105)
Derivative Asset, Cash Collateral	[2]	0	0
Derivative Asset, Net amount Total		4,283	145
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		139	228
Derivative Liabilities, Amount Offset		0	0
Derivative Liability		139	228
Derivative Liabilities, Financial Instruments	[1]	(139)	(105)
Derivative Liabilities, Cash Collateral	[2]	0	(107)
Derivative Liabilities, Net amount Total		0	16
Derivative Financial Instruments, Liabilities
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		430,049	446,852
Derivative Liabilities, Amount Offset		0	0
Derivative Liability		430,049	446,852
Derivative Liabilities, Financial Instruments	[1]	(430,049)	(446,729)
Derivative Liabilities, Cash Collateral	[2]	0	(107)
Derivative Liabilities, Net amount Total		0	16
Derivative Financial Instruments, Assets
Derivative instruments:
Derivative Asset, Gross Amount Recognized		4,422	250
Derivative Asset, Amount Offset		0	0
Derivative Asset		4,422	250
Derivative Asset, Financial Instruments	[1]	(139)	(105)
Derivative Asset, Cash Collateral	[2]		0
Derivative Asset, Net amount Total		4,283	145
Repurchase Agreements
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		429,910	446,624
Derivative Liabilities, Amount Offset		0	0
Derivative Liability		429,910	446,624
Derivative Liabilities, Financial Instruments	[1]	(429,910)	(446,624)
Derivative Liabilities, Cash Collateral	[2]	0
Derivative Liabilities, Net amount Total		0
TBA Commitments
Derivative instruments:
Derivative Asset, Gross Amount Recognized		4,162	230
Derivative Asset, Amount Offset		0
Derivative Asset		4,162	230
Derivative Asset, Financial Instruments	[1]	(139)	(105)
Derivative Asset, Cash Collateral	[2]	0	0
Derivative Asset, Net amount Total		4,023	125
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized		139	121
Derivative Liabilities, Amount Offset		0	0
Derivative Liability		139	121
Derivative Liabilities, Financial Instruments	[1]	(139)	(105)
Derivative Liabilities, Cash Collateral	[2]	0
Derivative Liabilities, Net amount Total		0	16
10-year U.S. Treasury Note Futures
Derivative instruments:
Derivative Asset, Gross Amount Recognized			16
Derivative Asset, Amount Offset			0
Derivative Asset		0	16
Derivative Asset, Financial Instruments	[1]		0
Derivative Asset, Cash Collateral	[2]		0
Derivative Asset, Net amount Total			16
Derivative instruments:
Derivative Liability		0	0
Options on U.S. Treasury Note Futures
Derivative instruments:
Derivative Asset, Gross Amount Recognized			4
Derivative Asset, Amount Offset			0
Derivative Asset		0	4
Derivative Asset, Financial Instruments	[1]		0
Derivative Asset, Cash Collateral	[2]		0
Derivative Asset, Net amount Total			4
Derivative instruments:
Derivative Liability		0	0
Interest Rate Swap
Derivative instruments:
Derivative Asset, Gross Amount Recognized		260
Derivative Asset, Amount Offset		0
Derivative Asset		260	0
Derivative Asset, Financial Instruments	[1]	0
Derivative Asset, Cash Collateral	[2]	0
Derivative Asset, Net amount Total		260
Derivative instruments:
Derivative Liabilities, Gross Amount Recognized			107
Derivative Liabilities, Amount Offset			0
Derivative Liability		$ 0	107
Derivative Liabilities, Financial Instruments	[1]		0
Derivative Liabilities, Cash Collateral	[2]		(107)
Derivative Liabilities, Net amount Total			$ 0

[1] Does not include the fair value amount of financial instrument collateral pledged in respect of repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets.

[2] Does not include the amount of cash collateral pledged in respect of derivative instruments and repurchase agreements that exceeds the associated liability presented in the consolidated balance sheets