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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Additional Information (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) bank | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Repayments of FHLB advances |  | $ 0 | $ 0 | $ 335,000,000
Weighted average interest rate (percent) |  | 4.59% | 0.20% |
Investment in capital stock of the federal reserve |  | $ 34,500,000 | $ 27,300,000 |
Number of correspondent banks | bank |  | 5 |  |
Available capacity |  | $ 445,000,000 | 441,000,000 |
Other borrowings |  | 0 | 25,000,000 |
Securities sold under repurchase agreements |  | 0 | 0 |
Collateral | Federal Home Loan Bank Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Advances from FHLB collateralized |  | $ 214,400,000 |  |
Revolving Credit Facility |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Line of credit facility |  |  | 50,000,000 |
Line of credit facility, commitment fee percentage |  | 0.40% |  |
Line of credit facility, current borrowing capacity |  | $ 0 | 0 |
Revolving Credit Facility | SOFR |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Basis spread on variable rate (percent) |  | 1.85% |  |
Federal Reserve Bank Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Amount of additional available borrowing |  | $ 1,060,000,000.00 |  |
Line of credit facility |  | 949,100,000 | 455,400,000 |
Other borrowings |  | 0 | 0 |
FHLB Advance Repaid June 2020 |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Repayments of FHLB advances | $ 100,000,000 |  |  |
Weighted average interest rate (percent) | 2.07% |  |  |
Extinguishment fee | $ 2,500,000 |  |  |
FHLB Advance Refinanced June 2020 |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
FHLB term advances refinanced | $ 111,000,000 |  |  |
Line of Credit | Unsecured Federal Funds Line of Credit |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Line of credit facility |  | 210,000,000 |  |
Other borrowings |  | 0 | 0 |
Other borrowings |  | 0 | 25,000,000 |
Collateralized loan obligations | Federal Reserve Bank Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Advances from FHLB collateralized |  | 1,310,000,000 | 813,800,000 |
Collateral on line of credit facility |  | 122,600,000 | 8,900,000 |
Federal Home Loan Bank of San Francisco |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
FHLB stock |  | 22,600,000 | $ 17,300,000 |
Federal Home Loan Bank of San Francisco | Real Estate Loans |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Overnight borrowings |  | 20,000,000 |  |
Term advances |  | 611,000,000 |  |
Term advances with put feature |  | $ 100,000,000 |  |
Weighted average life of advances maturing |  | 5 years |  |
Secured borrowing capacity from FHLB |  | $ 1,990,000,000 |  |
Advances from FHLB collateralized |  | 2,960,000,000 |  |
Federal Home Loan Bank of San Francisco | Investment Securities | Federal Home Loan Bank Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Secured borrowing capacity from FHLB |  | $ 162,400,000 |  |

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- Definition Federal Home Loan Bank, Advances, General Debt Obligations, Disclosure, Weighted Average Interest Rate, Variable + References No definition available. + Details
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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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