| Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] |
| (Dollars in thousands, except per share data) | | | | |
| | | | | |
| Consideration: | | | | |
| Cash | | $ | 50,876 | |
| Common stock (924,999 shares issued at $48.55 per share) | | | 44,909 | |
| Total consideration | | $ | 95,785 | |
| | | | | |
| Identifiable assets acquired | | | | |
| Cash and due from banks | | $ | 62,361 | |
| Interest-earning deposits | | | 42,084 | |
| Securities available for sale | | | 198,399 | |
| Loans, net | | | 201,320 | |
| Premises and equipment | | | 7,482 | |
| Core deposit intangible | | | 19,038 | |
| Other assets | | | 16,875 | |
| Total identifiable assets acquired | | | 547,559 | |
| | | | | |
| Identifiable liabilities assumed | | | | |
| Deposits | | $ | 474,898 | |
| Other liabilities | | | 1,093 | |
| Total identifiable liabilities acquired | | | 475,991 | |
| | | | | |
| Net identifiable assets acquired | | $ | 71,568 | |
| | | | | |
| Goodwill | | $ | 24,217 | |
|
| Business Combination, Pro Forma Information [Table Text Block] |
| | | Three Months Ended September 30, | | | Nine Months Ended September 30, | |
| (Dollars in thousands, except per share data) | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| | | | | | | | | | | | | | | | | |
| Net interest income | | $ | 60,872 | | | $ | 57,455 | | | $ | 173,800 | | | $ | 165,838 | |
| Provision for credit losses | | | 700 | | | | 179 | | | | (2,900 | ) | | | 3,586 | |
| Noninterest income | | | 12,303 | | | | 10,954 | | | | 35,437 | | | | 32,104 | |
| Noninterest expense | | | 43,226 | | | | 38,803 | | | | 123,917 | | | | 112,279 | |
| Income before income taxes | | | 29,249 | | | | 29,427 | | | | 88,220 | | | | 82,077 | |
| Income tax expense | | | 4,815 | | | | 4,212 | | | | 14,561 | | | | 13,130 | |
| | | | | | | | | | | | | | | | | |
| Net income | | $ | 24,434 | | | $ | 25,215 | | | $ | 73,659 | | | $ | 68,947 | |
| | | | | | | | | | | | | | | | | |
| Earnings per share | | $ | 1.41 | | | $ | 1.47 | | | $ | 4.27 | | | $ | 4.02 | |
|