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Note 7 - Investment Securities | 6 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 7. Investment Securities The following tables set forth the amortized cost, gross unrealized gains, gross unrealized losses, and fair value of securities available-for-sale ("AFS") as of June 30, 2025, and December 31, 2024
|  | June 30, 2025 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 768,375 |  |  | $ | 14 |  |  | $ | 140 |  |  | $ | 768,249 |
U.S. government agency entities |  |  | 7,991 |  |  |  | 54 |  |  |  | 111 |  |  |  | 7,934 |
Mortgage-backed securities |  |  | 751,160 |  |  |  | 102 |  |  |  | 92,831 |  |  |  | 658,431 |
Collateralized mortgage obligations |  |  | 26,023 |  |  |  | — |  |  |  | 2,096 |  |  |  | 23,927 |
Corporate debt securities |  |  | 193,154 |  |  |  | 79 |  |  |  | 3,341 |  |  |  | 189,892 |
Total |  | $ | 1,746,703 |  |  | $ | 249 |  |  | $ | 98,519 |  |  | $ | 1,648,433 |
|  | December 31, 2024 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 621,212 |  |  | $ | 250 |  |  | $ | — |  |  | $ | 621,462 |
U.S. government agency entities |  |  | 9,226 |  |  |  | 50 |  |  |  | 127 |  |  |  | 9,149 |
Mortgage-backed securities |  |  | 797,145 |  |  |  | 67 |  |  |  | 113,196 |  |  |  | 684,016 |
Collateralized mortgage obligations |  |  | 27,747 |  |  |  | — |  |  |  | 3,191 |  |  |  | 24,556 |
Corporate debt securities |  |  | 213,331 |  |  |  | 145 |  |  |  | 5,531 |  |  |  | 207,945 |
Total |  | $ | 1,668,661 |  |  | $ | 512 |  |  | $ | 122,045 |  |  | $ | 1,547,128 |
As of June 30, 2025, and December 31, 2024, the amortized cost of AFS securities excluded accrued interest receivables of $4.3 million and $4.6 million, respectively, which are included in accrued interest receivable on the Consolidated Balance Sheets. For the Company’s accounting policy related to AFS securities accrued interest receivable, see Note 1 - Summary of Significant Accounting Policies – Securities Available for Sale – Allowance for Credit Losses on Available for Sale Securities to the Consolidated Financial Statements in the Company’s 2024 Form 10-K. The amortized cost and fair value of AFS securities as of June 30, 2025, by contractual maturities, are set forth in the table below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or repayment penalties.
|  | June 30, 2025 |
|  | Securities AFS |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 838,473 |  |  | $ | 837,566 |
Due after one year through five years |  |  | 153,104 |  |  |  | 149,740 |
Due after five years through ten years |  |  | 72,971 |  |  |  | 69,984 |
Due after ten years |  |  | 682,155 |  |  |  | 591,143 |
Total |  | $ | 1,746,703 |  |  | $ | 1,648,433 |
Equity Securities - The Company recognized an unrealized net loss of $1.4 million for the three months ended June 30, 2025, compared to an unrealized net loss of $1.4 million for the three months ended June 30, 2024. The Company recognized an unrealized net loss of $5.6 million for the six months ended June 30, 2025, compared to an unrealized net loss of $10.5 million for the six months ended June 30, 2024. The $4.9 million decrease in unrealized loss was due to a smaller decrease in fair value of equity investments with readily determinable fair values for the six months ended June 30, 2025, as compared to the six months ended June 30, 2024. Equity securities were $28.8 million and $34.4 million as of June 30, 2025, and December 31, 2024, respectively. The following tables set forth the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of June 30, 2025, and December 31, 2024:
|  | June 30, 2025 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 570,370 |  |  | $ | 140 |  |  | $ | — |  |  | $ | — |  |  | $ | 570,370 |  |  | $ | 140 |
U.S. government agency entities |  |  | 2,332 |  |  |  | 2 |  |  |  | 2,845 |  |  |  | 109 |  |  |  | 5,177 |  |  |  | 111 |
Mortgage-backed securities |  |  | 28,273 |  |  |  | 424 |  |  |  | 628,662 |  |  |  | 92,407 |  |  |  | 656,935 |  |  |  | 92,831 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 23,927 |  |  |  | 2,096 |  |  |  | 23,927 |  |  |  | 2,096 |
Corporate debt securities |  |  | 9,980 |  |  |  | 20 |  |  |  | 119,833 |  |  |  | 3,321 |  |  |  | 129,813 |  |  |  | 3,341 |
Total |  | $ | 610,955 |  |  | $ | 586 |  |  | $ | 775,267 |  |  | $ | 97,933 |  |  | $ | 1,386,222 |  |  | $ | 98,519 |
|  | December 31, 2024 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (In thousands) |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency entities |  | $ | 4,199 |  |  | $ | 8 |  |  | $ | 2,108 |  |  | $ | 119 |  |  | $ | 6,307 |  |  | $ | 127 |
Mortgage-backed securities |  |  | 29,955 |  |  |  | 959 |  |  |  | 653,236 |  |  |  | 112,237 |  |  |  | 683,191 |  |  |  | 113,196 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 24,556 |  |  |  | 3,191 |  |  |  | 24,556 |  |  |  | 3,191 |
Corporate debt securities |  |  | 24,900 |  |  |  | 100 |  |  |  | 127,744 |  |  |  | 5,431 |  |  |  | 152,644 |  |  |  | 5,531 |
Total |  | $ | 59,054 |  |  | $ | 1,067 |  |  | $ | 807,644 |  |  | $ | 120,978 |  |  | $ | 866,698 |  |  | $ | 122,045 |
As of June 30, 2025, the Company had a total of 183 AFS securities in a gross unrealized loss position with no credit impairment, consisting primarily of 147 mortgage-backed securities, 14 Corporate debt securities, 11 U.S. treasury securities, eight U.S. government agency securities, and three collateralized mortgage obligations. In comparison, as of December 31, 2024, the Company has a total of 182 AFS securities in a gross unrealized loss position with no credit impairment, consisting primarily of 154 mortgage-backed securities, 16 Corporate debt securities, nine U.S. government agency securities, and three collateralized mortgage obligations. Allowance for Credit Losses The AFS securities that were in an unrealized loss position at June 30, 2025, were evaluated to determine whether the decline in fair value below the amortized cost basis resulted from a credit loss or other factors. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 1 - Summary of Significant Accounting Policies - Allowance for Credit Losses on Available for Sale Securities to the Consolidated Financial Statements in the Company’s 2024 Form 10-K. The Company concluded the unrealized losses were primarily attributed to yield curve movement, together with widened liquidity spreads and credit spreads. The issuers have not, to the Company’s knowledge, established any cause for default on these securities. The Company expects to recover the amortized cost basis of its securities and has no present intent to sell and will not be required to sell securities AFS that have declined below their cost before their anticipated recovery. Accordingly, no allowance for credit losses was recorded as of June 30, 2025, against these securities, and there was no provision for credit losses recognized for the three and six months ended June 30, 2025. AFS securities having a carrying value of $17.7 million and $17.8 million as of June 30, 2025, and December 31, 2024, respectively, were pledged to secure public deposits and other borrowings.

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