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Fair Value of Financial Instruments - Difference Between Fair Value and Unpaid Principal Balance (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value	$ 44,529,000	$ 164,591,000
Aggregate Unpaid Principal Balance	43,447,000	157,333,000
Difference	1,082,000	7,258,000
Nonaccrual mortgage loans held for sale recorded at fair value	1,800,000	681,000
Loans for which the fair value had been elected that were designated as nonaccrual or past due 90 days or more	0	0
Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value	37,032,000	136,026,000
Aggregate Unpaid Principal Balance	36,072,000	129,955,000
Difference	960,000	6,071,000
Commercial real estate LHFI
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value		17,011,000
Aggregate Unpaid Principal Balance		16,760,000
Difference		251,000
Securities carried at fair value through income
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate Fair Value	7,497,000	11,554,000
Aggregate Unpaid Principal Balance	7,375,000	10,618,000
Difference	122,000	936,000
U.S. government agency securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Loans, 90 days or more past due	$ 1,200,000	$ 473,000

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Fair Value, Option, Aggregate Fair Value

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(2)
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