| Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
| | | | | | | | | | | | | | | | | | | Percent | |
| | | September 30, 2026 | | | December 31, 2025 | | | Increase | |
| (Dollars in thousands) | | Balance | | | % | | | Balance | | | % | | | (Decrease) | |
| | | | | | | | | | | | | | | | | | | | | |
| Noninterest-bearing checking | | $ | 1,446,357 | | | | 25.8 | % | | $ | 1,339,666 | | | | 25.4 | % | | | 8.0 | % |
| Interest-bearing checking | | | 1,134,807 | | | | 20.2 | | | | 957,598 | | | | 18.1 | | | | 18.5 | |
| Money market | | | 1,900,363 | | | | 33.9 | | | | 1,697,604 | | | | 32.1 | | | | 11.9 | |
| Savings | | | 325,313 | | | | 5.8 | | | | 310,227 | | | | 5.9 | | | | 4.9 | |
| Time Deposits | | | 785,350 | | | | 13.9 | | | | 848,844 | | | | 16.1 | | | | (7.5 | ) |
| Total local deposits | | | 5,592,190 | | | | 99.6 | | | | 5,153,939 | | | | 97.6 | | | | 8.5 | |
| | | | | | | | | | | | | | | | | | | | | |
| Out-of-area time, $100,000 and over | | | 20,086 | | | | 0.4 | | | | 130,513 | | | | 2.4 | | | | (84.6 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Total deposits | | $ | 5,612,276 | | | | 100.0 | % | | $ | 5,284,452 | | | | 100.0 | % | | | 6.2 | % |
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