Borrowings - Additional Information (Detail) - USD ($)
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3 Months Ended |
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Jul. 17, 2025 |
Sep. 26, 2023 |
Sep. 15, 2023 |
Jul. 12, 2023 |
Feb. 10, 2023 |
Jun. 29, 2020 |
Mar. 31, 2026 |
Dec. 31, 2025 |
Jul. 23, 2020 |
| Debt Instrument [Line Items] |
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| Line of credit facility maximum borrowing capacity |
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$ 25,000,000
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| Debt Instrument, Maturity Date |
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Feb. 10, 2024
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| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |
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20.00%
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| Debt instrument floating daily, floor Interest Rate |
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3.25%
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| Trust Preferred Securities [Member] | FCB Capital Trust II [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
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Apr. 15, 2035
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| Subordinated debenture basis spread on variable rate |
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2.00%
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| Preferred securities liquidation spread percent |
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2.00%
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| Trust Preferred Securities [Member] | FCB Capital Trust II [Member] | Tenor Spread Adjustment [Member] |
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| Debt Instrument [Line Items] |
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| Preferred securities liquidation spread percent |
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0.26%
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| Trust Preferred Securities [Member] | FCB Capital Trust III [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
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Jun. 15, 2037
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| Subordinated debenture basis spread on variable rate |
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1.89%
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| Preferred securities liquidation spread percent |
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1.89%
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| Trust Preferred Securities [Member] | FCB Capital Trust III [Member] | Tenor Spread Adjustment [Member] |
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| Debt Instrument [Line Items] |
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| Preferred securities liquidation spread percent |
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0.26%
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| Trust Preferred Securities [Member] | Community First Statutory Trust I [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
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Dec. 26, 2032
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| Subordinated debenture basis spread on variable rate |
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3.25%
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| Preferred securities liquidation spread percent |
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3.25%
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| Trust Preferred Securities [Member] | Community First Statutory Trust I [Member] | Tenor Spread Adjustment [Member] |
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| Debt Instrument [Line Items] |
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| Preferred securities liquidation spread percent |
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0.26%
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| Trust Preferred Securities [Member] | American State Bank Statutory Trust I [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
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Sep. 15, 2035
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| Subordinated debenture basis spread on variable rate |
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1.80%
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| Preferred securities liquidation spread percent |
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1.80%
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| Trust Preferred Securities [Member] | American State Bank Statutory Trust I [Member] | Tenor Spread Adjustment [Member] |
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| Debt Instrument [Line Items] |
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| Preferred securities liquidation spread percent |
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0.26%
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| Federal Home Loan Bank Advances [Member] |
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| Debt Instrument [Line Items] |
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| Letter of credit |
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$ 59,742,000
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$ 64,635,000
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| Line of credit facility additional borrowing capacity |
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494,792,000
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567,399,000
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| Federal Home Loan Bank Advances [Member] | Qualifying Loans [Member] |
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| Debt Instrument [Line Items] |
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| Line of credit facility maximum borrowing capacity |
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904,073,000
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932,939,000
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| Federal Reserve Bank Borrowings [Member] |
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| Debt Instrument [Line Items] |
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| Line of credit facility maximum borrowing capacity |
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2,142,985,000
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1,863,782,000
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| Federal Reserve Bank Borrowings [Member] | Asset Pledged as Collateral without Right [Member] |
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| Debt Instrument [Line Items] |
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| Pledged loan outstanding balance |
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2,622,634,000
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2,456,465,000
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| Federal Reserve's Bank Term Funding Program [Member] |
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| Debt Instrument [Line Items] |
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| Secured borrowings from this facility |
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0
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0
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| Bank Stock Loan [Member] |
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| Debt Instrument [Line Items] |
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| Bank stock loan |
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$ 0
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0
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| Residential Mortgage-Backed Securities (Issued by Government-Sponsored Entities) [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
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Jun. 30, 2030
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| Subordinated notes aggregate principal amount |
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$ 42,000,000
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$ 33,000,000
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| Subordinated notes commencement date |
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Dec. 30, 2020
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| Debt instrument interest rate percentage |
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7.00%
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| Subordinated notes description |
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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.
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| Debt instrument, frequency of periodic payment |
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semi-annually
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| 7.125% Fixed-to-Floating Rate Subordinated Notes Due 2035 [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Maturity Date |
Aug. 01, 2035
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| Subordinated notes aggregate principal amount |
$ 75,000,000
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$ 75,000,000
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75,000,000
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| Subordinated notes commencement date |
Feb. 01, 2026
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| Debt instrument interest rate percentage |
7.125%
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| Subordinated notes description |
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From July 17, 2025, through August 1, 2030, the Company will pay interest on the notes semi-annually in arrears on February 1 and August 1 of each year, commencing on February 1, 2026, at a fixed interest rate of 7.125%. Beginning August 1, 2030, 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 349 basis points for each quarterly interest period during the floating rate period. Interest payments during the floating-rate period will be paid quarterly in arrears on February 1, May 1, August 1 and November 1 of each year, commencing on November 1, 2030.
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| Debt instrument, frequency of periodic payment |
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semi-annually
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| Subordinated notes variable interest rate percentage |
SOFR, as defined in the Indenture, plus 349 basis points
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| Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |
SOFR plus [Member]
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| Government-Sponsored Residential Mortgage-Backed Securities [Member] |
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| Debt Instrument [Line Items] |
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| Residential mortgage-backed securities, fair value |
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$ 39,826,000
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$ 41,481,000
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