Debt instrument extended date.

No definition available.

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- Definition

Debt instrument floating, floor interest rate.

+ References

No definition available.

+ Details

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- Definition

Line of credit facility additional borrowings capacity.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Section 50
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-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(2))
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-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Period of time between issuance and maturity of debt instrument, 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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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- Definition

Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

Fair value of the securities pledged as collateral against securities loaned.

+ References

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- Definition

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

+ References

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Borrowings - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
Borrowings - Additional Information (Detail) - USD ($)	Mar. 11, 2019	Mar. 13, 2017	Jun. 29, 2020	Mar. 31, 2021	Dec. 31, 2020	Jul. 23, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 40,000,000	$ 30,000,000
Debt Instrument, Maturity Date	May 15, 2020			Aug. 15, 2021
Debt instrument extended date				Aug. 15, 2020
Debt instrument term		5 years
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
Debt instrument floating daily, floor Interest Rate		3.50%
Subordinated notes maturity date	May 15, 2020			Aug. 15, 2021
Trust Preferred Securities [Member] \| FCB Capital Trust II [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Apr. 15, 2035
Subordinated notes maturity date				Apr. 15, 2035
Trust Preferred Securities [Member] \| FCB Capital Trust II [Member] \| Three month LIBOR [Member]
Debt Instrument [Line Items]
Subordinated debenture basis spread on variable rate				2.00%
Trust Preferred Securities [Member] \| FCB Capital Trust III [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Jun. 15, 2037
Subordinated notes maturity date				Jun. 15, 2037
Trust Preferred Securities [Member] \| FCB Capital Trust III [Member] \| Three month LIBOR [Member]
Debt Instrument [Line Items]
Subordinated debenture basis spread on variable rate				1.89%
Trust Preferred Securities [Member] \| Community First Statutory Trust I [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Dec. 26, 2032
Subordinated notes maturity date				Dec. 26, 2032
Trust Preferred Securities [Member] \| Community First Statutory Trust I [Member] \| Three month LIBOR [Member]
Debt Instrument [Line Items]
Subordinated debenture basis spread on variable rate				3.25%
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 745,463,000	$ 763,506,000
Line of credit facility additional borrowing capacity				719,762,000	661,490,000
Federal Reserve Bank [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				275,328,000
Pledged loan outstanding balance				292,646,000
Pledged securities, fair value				58,650,000
Secured borrowings from this facility				0			$ 0
Bank Stock Loan [Member]
Debt Instrument [Line Items]
Bank stock loan				$ 0	$ 0
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date			Jun. 30, 2030
Debt instrument term				9 years 3 months 18 days	9 years 6 months
Subordinated notes aggregate principal amount			$ 42,000,000	$ 75,000,000	$ 75,000,000	$ 33,000,000
Subordinated notes maturity date			Jun. 30, 2030
Subordinated notes commencement date			Dec. 30, 2020
Subordinated notes fixed interest rate percentage			7.00%
Subordinated notes description			From June 29, 2020, through June 29, 2025, the Company will pay interest on the notes semi-annually in arrears on June 30 and December 30 of each year, commencing on December 30, 2020, at a fixed interest rate of 7.00%. Beginning June 30, 2025, the notes convert to a floating interest rate, to be reset quarterly, equal to the then-current Three-Month Term SOFR, as defined in the Indenture, plus 688 basis points. Interest payments during the floating-rate period will be paid quarterly in arrears on March 30, June 30, September 30 and December 30 of each year, commencing on September 30, 2025.
Debt instrument, frequency of periodic payment				semi-annually
Subordinated notes commencement date			Dec. 30, 2020
Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member] \| SOFR plus [Member]
Debt Instrument [Line Items]
Subordinated notes commencement date			Sep. 30, 2025
Debt instrument, frequency of periodic payment			quarterly
Subordinated notes variable interest rate percentage			SOFR, as defined in the Indenture, plus 688 basis points
Subordinated notes commencement date			Sep. 30, 2025
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Debt Instrument [Line Items]
Residential mortgage-backed securities, fair value				$ 42,569,000	$ 47,113,000