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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Fair Value of Derivatives (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Mar. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) item
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Loan pool hedge | $ 50,000,000.0 |  |
Term of interest rate risk cash flow hedge | 5 years |  |
Amount of ineffectiveness, included in net income |  | $ 0 |
Interest Rate Products |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Notional Amount |  | 25,800,000 |
Designated as Hedging Instrument [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative liabilities designated as hedging instruments, fair value |  | $ 2,705,000 |
Designated as Hedging Instrument [Member] | Interest Rate Products |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative assets designated as hedging instruments, classified in other assets |  |  | $ 808,000
Derivative liabilities designated as hedging instruments, fair value |  |  | $ 4,102,000
Designated as Hedging Instrument [Member] | Interest Rate Products | OSBC Affiliates |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative, number of transactions | item |  | 2 | 2
Notional Amount |  | $ 75,774,000 | $ 75,774,000
Derivative liabilities designated as hedging instruments, classified in other liabilities |  | 2,705,000 | 4,102,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Cash collateral pledged with financial institutions, dollars |  | 18,500,000 | 17,200,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | OSBC Affiliates |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative assets designated as hedging instruments, classified in other assets |  |  | $ 808,000
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative assets not designated as hedging instruments, fair value |  | 1,882,000 |
Total Derivative liabilities not designated as hedging instruments, fair value |  | $ 958,000 |
Not Designated as Hedging Instrument [Member] | Interest Rate Products | Commercial Loan Customers |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative, number of transactions | item |  | 23 | 26
Notional Amount |  | $ 150,712,000 | $ 165,005,000
Interest rate derivatives, derivative assets not designated as hedging instruments, classified in other assets |  | 952,000 | 2,686,000
Interest rate derivatives, derivative not designated as hedging instruments, classified in other liabilities |  | $ 952,000 | $ 2,686,000
Weighted average maturity |  | 5 years 10 months 24 days | 3 years 10 months 24 days
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Cash collateral pledged with financial institutions, dollars |  | $ 0 | $ 180,000,000,000
Investment securities pledged with financial institutions, dollars |  | $ 0 | $ 0
Number of correspondent financial institutions where investment securities are pledged | item |  | 1 | 1
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments and Forward Contracts. |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative, number of transactions | item |  | 81 | 3
Notional Amount |  | $ 32,994,000 | $ 17,173,000
Interest rate derivatives, derivative assets not designated as hedging instruments, classified in other assets |  | $ 930,000 |
Interest rate derivatives, derivative not designated as hedging instruments, classified in other liabilities |  |  | $ 21,000
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments and Forward Contracts. | Commercial Loan Customers |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative, number of transactions | item |  |  | 87
Notional Amount |  |  | $ 34,414,000
Interest rate derivatives, derivative assets not designated as hedging instruments, classified in other assets |  |  | 508,000
Not Designated as Hedging Instrument [Member] | Other Contracts |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Derivative, number of transactions | item |  | 3 |
Notional Amount |  | $ 17,050,000 |
Derivative assets designated as hedging instruments, classified in other assets |  |  | 3,194,000
Derivative liabilities designated as hedging instruments, classified in other liabilities |  |  | $ 2,707,000
Interest rate derivatives, derivative not designated as hedging instruments, classified in other liabilities |  | 6,000 |
Interest Income [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Amount to be reclassified as an increase to interest expense during the next twelve months |  | 178,000 |
Interest Expense [Member] |  |  |
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk |  |  |
Amount to be reclassified as an increase to interest expense during the next twelve months |  | $ 162,000 |

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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