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Investment Securities Available for Sale, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 38,136,000		$ 38,136,000		$ 26,688,000
Unrealized gains (losses) on investments	1,500,000	$ 8,000,000	3,100,000	$ 6,100,000
Sales Proceeds	0	3,770,000	$ 24,374,000	115,398,000
Contractual maturities (up to)			37 years
Weighted average life of available for sale securities portfolio			6 years		5 years 9 months 18 days
Allowance for credit loss	0		$ 0		$ 0
Debt securities, allowance for credit loss, period increase (decrease)	0	$ 0	0	$ 0
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Accrued interest receivable	$ 400,000		$ 400,000		$ 700,000

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Represents the weighted average life of the available for sale securities portfolio.

+ References

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Contractual maturities of investments.

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Proceeds Including Receivable For Unsettled Trades From Sale of Debt Securities, Available-for-sale

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- Definition

Amount of increase (decrease) in 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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount of unrealized gain (loss) 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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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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