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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | September 30, 2025 |  |  |  |  |
|  | Fair Value Measurements Using |  |  | Total Fair Value |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Measurements |
|  | ($ In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 776,833 |  |  | $ | — |  |  | $ | — |  |  | $ | 776,833 |
U.S. government agency entities |  |  | — |  |  |  | 6,860 |  |  |  | — |  |  |  | 6,860 |
U.S. government sponsored entities |  |  | — |  |  |  | 25,005 |  |  |  | — |  |  |  | 25,005 |
Mortgage-backed securities |  |  | — |  |  |  | 645,575 |  |  |  | — |  |  |  | 645,575 |
Collateralized mortgage obligations |  |  | — |  |  |  | 23,302 |  |  |  | — |  |  |  | 23,302 |
Corporate debt securities |  |  | — |  |  |  | 165,875 |  |  |  | — |  |  |  | 165,875 |
Total securities AFS |  |  | 776,833 |  |  |  | 866,617 |  |  |  | — |  |  |  | 1,643,450 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 5,686 |  |  |  | — |  |  |  | — |  |  |  | 5,686 |
Preferred stock of government sponsored entities |  |  | 10,278 |  |  |  | — |  |  |  | — |  |  |  | 10,278 |
Other equity securities |  |  | 14,608 |  |  |  | — |  |  |  | — |  |  |  | 14,608 |
Total equity securities |  |  | 30,572 |  |  |  | — |  |  |  | — |  |  |  | 30,572 |
Interest rate swaps |  |  | — |  |  |  | 29,162 |  |  |  | — |  |  |  | 29,162 |
Foreign exchange contracts |  |  | — |  |  |  | 321 |  |  |  | — |  |  |  | 321 |
Total assets |  | $ | 807,405 |  |  | $ | 896,100 |  |  | $ | — |  |  | $ | 1,703,505 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 31,815 |  |  | $ | — |  |  | $ | 31,815 |
Foreign exchange contracts |  |  | — |  |  |  | 185 |  |  |  | — |  |  |  | 185 |
Total liabilities |  | $ | — |  |  | $ | 32,000 |  |  | $ | — |  |  | $ | 32,000 |
|  | December 31, 2024 |  |  |  |  |
|  | Fair Value Measurements Using |  |  | Total Fair Value |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Measurements |
|  | ($ In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 621,462 |  |  | $ | — |  |  | $ | — |  |  | $ | 621,462 |
U.S. government agency entities |  |  | — |  |  |  | 9,149 |  |  |  | — |  |  |  | 9,149 |
Mortgage-backed securities |  |  | — |  |  |  | 684,016 |  |  |  | — |  |  |  | 684,016 |
Collateralized mortgage obligations |  |  | — |  |  |  | 24,556 |  |  |  | — |  |  |  | 24,556 |
Corporate debt securities |  |  | — |  |  |  | 207,945 |  |  |  | — |  |  |  | 207,945 |
Total securities AFS |  |  | 621,462 |  |  |  | 925,666 |  |  |  | — |  |  |  | 1,547,128 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 5,532 |  |  |  | — |  |  |  | — |  |  |  | 5,532 |
Preferred stock of government sponsored entities |  |  | 7,287 |  |  |  | — |  |  |  | — |  |  |  | 7,287 |
Other equity securities |  |  | 20,071 |  |  |  | — |  |  |  | — |  |  |  | 20,071 |
Total equity securities |  |  | 32,890 |  |  |  | — |  |  |  | — |  |  |  | 32,890 |
Interest rate swaps |  |  | — |  |  |  | 39,958 |  |  |  | — |  |  |  | 39,958 |
Foreign exchange contracts |  |  | — |  |  |  | 490 |  |  |  | — |  |  |  | 490 |
Total assets |  | $ | 654,352 |  |  | $ | 966,114 |  |  | $ | — |  |  | $ | 1,620,466 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 36,319 |  |  | $ | — |  |  | $ | 36,319 |
Foreign exchange contracts |  |  | — |  |  |  | 785 |  |  |  | — |  |  |  | 785 |
Total liabilities |  | $ | — |  |  | $ | 37,104 |  |  | $ | — |  |  | $ | 37,104 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | As of September 30, 2025 |  |  | Total Losses |
|  | Fair Value Measurements Using |  |  | Total Fair Value |  |  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Measurements |  |  | September 30, 2025 |  |  | September 30, 2024 |  |  | September 30, 2025 |  |  | September 30, 2024 |
|  | ($ In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 5,741 |  |  | $ | 5,741 |  |  | $ | 9,028 |  |  | $ | 1,923 |  |  | $ | 9,115 |  |  | $ | 2,961 |
Commercial real estate loans |  |  | — |  |  |  | — |  |  |  | 32,095 |  |  |  | 32,095 |  |  |  | 314 |  |  |  | 1,746 |  |  |  | 4,153 |  |  |  | 1,997 |
Residential mortgage loans and equity lines |  |  | — |  |  |  | — |  |  |  | 222 |  |  |  | 222 |  |  |  | — |  |  |  | 59 |  |  |  | — |  |  |  | 59 |
Total non-accrual loans |  |  | — |  |  |  | — |  |  |  | 38,058 |  |  |  | 38,058 |  |  |  | 9,342 |  |  |  | 3,728 |  |  |  | 13,268 |  |  |  | 5,017 |
Other real estate owned (1) |  |  | — |  |  |  | — |  |  |  | 34,746 |  |  |  | 34,746 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other equity securities |  |  | — |  |  |  | — |  |  |  | 1,539 |  |  |  | 1,539 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 84 |  |  |  | 84 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total assets |  | $ | — |  |  | $ | — |  |  | $ | 74,427 |  |  | $ | 74,427 |  |  | $ | 9,342 |  |  | $ | 3,728 |  |  | $ | 13,268 |  |  | $ | 5,017 |
(1) Other real estate owned balance of $33.0 million in the Consolidated Balance Sheets is net of estimated disposal costs. |
|  | As of December 31, 2024 |  |  | Total Losses |
|  | Fair Value Measurements Using |  |  | Total Fair Value |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Measurements |  |  | December 31, 2024 |  |  | December 31, 2023 |
|  | ($ In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-accrual loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 10,896 |  |  | $ | 10,896 |  |  | $ | 5,654 |  |  | $ | — |
Commercial real estate loans |  |  | — |  |  |  | — |  |  |  | 15,320 |  |  |  | 15,320 |  |  |  | 4,049 |  |  |  | 4,069 |
Residential mortgage loans and equity lines |  |  | — |  |  |  | — |  |  |  | 243 |  |  |  | 243 |  |  |  | 59 |  |  |  | — |
Total non-accrual loans |  |  | — |  |  |  | — |  |  |  | 26,459 |  |  |  | 26,459 |  |  |  | 9,762 |  |  |  | 4,069 |
Other real estate owned (1) |  |  | — |  |  |  | — |  |  |  | 24,126 |  |  |  | 24,126 |  |  |  | — |  |  |  | — |
Other equity securities |  |  | — |  |  |  | — |  |  |  | 1,539 |  |  |  | 1,539 |  |  |  | — |  |  |  | — |
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 86 |  |  |  | 86 |  |  |  | 147 |  |  |  | 227 |
Total assets |  | $ | — |  |  | $ | — |  |  | $ | 52,210 |  |  | $ | 52,210 |  |  | $ | 9,909 |  |  | $ | 4,296 |
(1) Other real estate owned balance of $23.1 million in the Consolidated Balance Sheets is net of estimated disposal costs. |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | September 30, 2025 |  |  | December 31, 2024 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | ($ In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 166,167 |  |  | $ | 166,167 |  |  | $ | 157,167 |  |  | $ | 157,167 |
Short-term investments |  |  | 1,141,886 |  |  |  | 1,141,886 |  |  |  | 882,353 |  |  |  | 882,353 |
Securities AFS |  |  | 1,643,450 |  |  |  | 1,643,450 |  |  |  | 1,547,128 |  |  |  | 1,547,128 |
Loans held for investment, net |  |  | 19,903,082 |  |  |  | 20,447,466 |  |  |  | 19,203,649 |  |  |  | 19,500,647 |
Equity securities |  |  | 32,111 |  |  |  | 32,111 |  |  |  | 34,429 |  |  |  | 34,429 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 114,395 |  |  | $ | 321 |  |  | $ | 62,794 |  |  | $ | 490 |
Interest rate swaps |  |  | 1,064,539 |  |  |  | 29,162 |  |  |  | 1,065,580 |  |  |  | 39,958 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 20,521,149 |  |  | $ | 20,506,029 |  |  | $ | 19,686,199 |  |  | $ | 19,670,327 |
Advances from Federal Home Loan Bank |  |  | 190,000 |  |  |  | 189,312 |  |  |  | 60,000 |  |  |  | 59,606 |
Other borrowings |  |  | 17,628 |  |  |  | 15,338 |  |  |  | 17,740 |  |  |  | 15,281 |
Long-term debt |  |  | 119,136 |  |  |  | 78,627 |  |  |  | 119,136 |  |  |  | 73,752 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 122,381 |  |  | $ | 185 |  |  | $ | 171,945 |  |  | $ | 785 |
Interest rate swaps |  |  | 1,542,988 |  |  |  | 31,815 |  |  |  | 1,198,471 |  |  |  | 36,319 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 3,670,598 |  |  | $ | (18,620 | ) |  | $ | 3,470,296 |  |  | $ | (18,226 | )
Standby letters of credit |  |  | 510,886 |  |  |  | (3,225 | ) |  |  | 439,769 |  |  |  | (2,900 | )
Other letters of credit |  |  | 6,452 |  |  |  | (7 | ) |  |  | 12,347 |  |  |  | (14 | )
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of September 30, 2025 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | ($ In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 166,167 |  |  | $ | 166,167 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 1,141,886 |  |  |  | 1,141,886 |  |  |  | — |  |  |  | — |
Loans held for investment, net |  |  | 20,447,466 |  |  |  | — |  |  |  | — |  |  |  | 20,447,466 |
Equity securities |  |  | 1,539 |  |  |  | — |  |  |  | — |  |  |  | 1,539 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 20,506,029 |  |  |  | — |  |  |  | — |  |  |  | 20,506,029 |
Advances from Federal Home Loan Bank |  |  | 189,312 |  |  |  | — |  |  |  | 189,312 |  |  |  | — |
Other borrowings |  |  | 15,338 |  |  |  | — |  |  |  | — |  |  |  | 15,338 |
Long-term debt |  |  | 78,627 |  |  |  | — |  |  |  | 78,627 |  |  |  | — |
|  | As of December 31, 2024 |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | ($ In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 157,167 |  |  | $ | 157,167 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 882,353 |  |  |  | 882,353 |  |  |  | — |  |  |  | — |
Loans held for investment, net |  |  | 19,500,647 |  |  |  | — |  |  |  | — |  |  |  | 19,500,647 |
Equity securities |  |  | 1,539 |  |  |  | — |  |  |  | — |  |  |  | 1,539 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 19,670,327 |  |  |  | — |  |  |  | — |  |  |  | 19,670,327 |
Advances from Federal Home Loan Bank |  |  | 59,606 |  |  |  | — |  |  |  | 59,606 |  |  |  | — |
Other borrowings |  |  | 15,281 |  |  |  | — |  |  |  | — |  |  |  | 15,281 |
Long-term debt |  |  | 73,752 |  |  |  | — |  |  |  | 73,752 |  |  |  | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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