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Fair Value - Summary of loans accounted for under the fair value option (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans held for sale	$ 91,243		$ 91,243		$ 208,704
Interest income	9,545	$ 12,622	39,434	$ 29,818
Loans Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Contractual balance	88,682		88,682		199,975
Interest income			2,770	1,904
Gain (loss)	2,561		2,561		8,729
Change in fair value	(1,381)	1,300	(6,168)	3,190
Total gain (loss)			(3,398)	5,094
SBA Loan
Fair Value, Option, Quantitative Disclosures [Line Items]
Contractual balance	9,657		9,657		9,266
Interest income			462	465
Gain (loss)	148		148		$ (2)
Change in fair value	$ 72	$ 55	151	49
Total gain (loss)			$ 613	$ 514

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Far Value, Option, Loans As Assets, Contractual Balance

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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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-Topic 825
-SubTopic 10
-Section 50
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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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