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Investment Securities - Debt Securities, Held-to-maturity, Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	$ 870,294	$ 840,259
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	322,877	361,107
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	7,152	7,189
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	1,909	1,928
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	201,097	204,495
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	150,852	151,711
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	186,407	$ 113,829
AAA
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	62,327
AAA | Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AAA | Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AAA | Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AAA | Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AAA | Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AAA | Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	62,327
AA
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	7,132
AA | Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	7,132
A
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	34,563
A | Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
A | Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
A | Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
A | Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
A | Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
A | Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	34,563
BBB
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	9,256
BBB | Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
BBB | Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
BBB | Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
BBB | Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
BBB | Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	0
BBB | Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	9,256
Not Rated
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	757,016
Not Rated | Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	322,877
Not Rated | Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	7,152
Not Rated | Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	1,909
Not Rated | Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	201,097
Not Rated | Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	150,852
Not Rated | Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Investment securities held to maturity	$ 73,129

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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