Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,559,151		$ 1,701,379
Gross Unrealized Gains	128		16,943
Gross Unrealized (Losses)	(187,558)		(14,475)
Allowance for Credit Losses	0	$ 0	0
Debt securities available for sale	1,371,721		1,703,847
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	67,491		34,711
Gross Unrealized Gains	0		404
Gross Unrealized (Losses)	(4,210)		(236)
Debt securities available for sale	63,281		34,879
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,399,397		1,553,491
Gross Unrealized Gains	122		14,141
Gross Unrealized (Losses)	(175,867)		(13,273)
Debt securities available for sale	1,223,652		1,554,359
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,698		4,159
Gross Unrealized Gains	0		20
Gross Unrealized (Losses)	(141)		0
Debt securities available for sale	3,557		4,179
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,565		109,018
Gross Unrealized Gains	6		2,378
Gross Unrealized (Losses)	(7,340)		(966)
Debt securities available for sale	$ 81,231		$ 110,430

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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