Netting of Derivative Assets and Derivative Liabiities (Details) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Derivative [Line Items]
Derivative Assets, Netting Adjustments and Cash Collateral	[1],[2]	$ 196,861		$ 144,402
Derivative liability, Netting Adjustments and Cash Collateral	[1],[2]	80,245		33,534
Derivative assets		227,720		159,731
Derivative liabilities		(24,404)		(10,271)
Derivative Asset, Fair value, amount offset against collateral		227,720		158,736
Derivative Liability, Fair value, amount offset against collateral		(2,962)		(856)
Derivative Liabilities, additional net exposure, collateral pledged to counterparties in excess of net liabilities		158		300
Uncleared derivatives [Member]
Derivative [Line Items]
Derivative Asset, total gross recognized amount		13,187		4,950
Derivative Liability, total gross recognized amount		(100,449)		(42,199)
Derivative Assets, Netting Adjustments and Cash Collateral		(13,187)	[3]	(3,519)	[4]
Derivative liability, Netting Adjustments and Cash Collateral		76,740	[3]	31,928	[4]
Derivative assets		147		1,658
Derivative liabilities		(24,404)		(10,271)
Derivative Assets, fair value of securities pledged as collateral than can be sold or repledged		0	[5]	(995)	[6]
Derivative Liabilities, fair value of securities pledged as collateral that can be sold or repledged		0	[5]	82	[6]
Derivative Assets, fair value of securities pledged as collateral that cannot be sold or repledged		0	[5]	0	[6]
Derivative Liabilities, fair value of securities pledged as collateral that cannot be sold or repledged		21,442	[5]	9,333	[6]
Derivative Asset, Fair value, amount offset against collateral		147		663
Derivative Liability, Fair value, amount offset against collateral		(2,962)		(856)
Cleared derivatives [Member]
Derivative [Line Items]
Derivative Asset, total gross recognized amount		17,526		10,152
Derivative Liability, total gross recognized amount		(3,506)		(1,606)
Derivative Assets, Netting Adjustments and Cash Collateral		210,047	[3]	147,921	[4]
Derivative liability, Netting Adjustments and Cash Collateral		3,506	[3]	1,606	[4]
Derivative assets		227,573		158,073
Derivative liabilities		0		0
Derivative Assets, fair value of securities pledged as collateral than can be sold or repledged		0	[5]	0	[6]
Derivative Liabilities, fair value of securities pledged as collateral that can be sold or repledged		0	[5]	0	[6]
Derivative Assets, fair value of securities pledged as collateral that cannot be sold or repledged		0	[5]	0	[6]
Derivative Liabilities, fair value of securities pledged as collateral that cannot be sold or repledged		0	[5]	0	[6]
Derivative Asset, Fair value, amount offset against collateral		227,573		158,073
Derivative Liability, Fair value, amount offset against collateral		0		0
Mortgage Receivable [Member] | Uncleared derivatives [Member] | Mortgage-delivery commitments [Member]
Derivative [Line Items]
Derivative Asset, Mortgage delivery commitments		147		227
Derivative Liabilities, Mortgage delivery commitments		$ (695)		$ 0

[1] Amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions with the same counterparty. Cash collateral and related accrued interest posted was $278.3 million and $178.5 million at March 31, 2020, and December 31, 2019, respectively. The change in cash collateral posted is included in the net change in interest-bearing deposits in the statement of cash flows. Cash collateral and related accrued interest received was $1.2 million and $561 thousand at March 31, 2020, and December 31, 2019.

[2] These amounts represent the effect of master-netting agreements intended to allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing member and/or counterparty.

[3] Includes gross amounts of netting adjustments and cash collateral.

[4] Includes gross amounts of netting adjustments and cash collateral.

[5] Includes non-cash collateral at fair value. Any overcollateralization with a counterparty is not included in the determination of the net amount. At March 31, 2020, we had additional net credit exposure of $158 thousand due to instances where our collateral pledged to a counterparty exceeded our net derivative liability position.

[6] Includes non-cash collateral at fair value. Any overcollateralization with a counterparty is not included in the determination of the net amount. At December 31, 2019, we had additional net credit exposure of $300 thousand due to instances where our collateral pledged to a counterparty exceeded our net derivative liability position.