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Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Equity securities gains and losses [Table Text Block] |
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
| 2025 |  | 2024 |  | 2025 |  | 2024
| Dollars in thousands
Net gains recognized during the period on equity securities | $ | 380 |  |  | $ | 685 |  |  | $ | 549 |  |  | $ | 1,187 |
Less: net gains recognized during the period on equity securities sold during the period | 12 |  |  | 81 |  |  | 18 |  |  | 519 |
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date | $ | 368 |  |  | $ | 604 |  |  | $ | 531 |  |  | $ | 668 |
Debt Securities, Available-for-sale [Table Text Block] | The following table summarizes the amortized cost, allowance for credit losses, and fair value of available for sale securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) at the dates indicated:
| September 30, 2025 |  | December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for credit losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for credit losses |  | Fair Value
| (Dollars in thousands)
U.S. government agency securities | $ | 228,889 |  |  | $ | — |  |  | $ | (11,714) |  |  | $ | — |  |  | $ | 217,175 |  |  | $ | 229,452 |  |  | $ | — |  |  | $ | (19,792) |  |  | $ | — |  |  | $ | 209,660 |
U.S. treasury securities | 485,194 |  |  | 14 |  |  | (18,231) |  |  | — |  |  | 466,977 |  |  | 628,017 |  |  | — |  |  | (36,016) |  |  | — |  |  | 592,001 |
Agency mortgage-backed securities | 727,744 |  |  | 4,224 |  |  | (24,703) |  |  | — |  |  | 707,265 |  |  | 415,918 |  |  | 25 |  |  | (37,782) |  |  | — |  |  | 378,161 |
Agency collateralized mortgage obligations | 279,977 |  |  | 830 |  |  | (4,630) |  |  | — |  |  | 276,177 |  |  | 31,168 |  |  | 1 |  |  | (2,174) |  |  | — |  |  | 28,995 |
Non-taxable municipal securities | 14,611 |  |  | 54 |  |  | — |  |  | — |  |  | 14,665 |  |  | 197 |  |  | — |  |  | (3) |  |  | — |  |  | 194 |
Taxable municipal securities | 217,056 |  |  | 2,355 |  |  | (67) |  |  | — |  |  | 219,344 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Pooled trust preferred securities issued by banks and insurers | 1,120 |  |  | — |  |  | (80) |  |  | — |  |  | 1,040 |  |  | 1,180 |  |  | — |  |  | (85) |  |  | — |  |  | 1,095 |
Small business administration pooled securities | 43,756 |  |  | — |  |  | (5,179) |  |  | — |  |  | 38,577 |  |  | 48,032 |  |  | — |  |  | (7,194) |  |  | — |  |  | 40,838 |
Total available for sale securities | $ | 1,998,347 |  |  | $ | 7,477 |  |  | $ | (64,604) |  |  | $ | — |  |  | $ | 1,941,220 |  |  | $ | 1,353,964 |  |  | $ | 26 |  |  | $ | (103,046) |  |  | $ | — |  |  | $ | 1,250,944 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] | These available for sale securities are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position:
| September 30, 2025
|  |  | Less than 12 months |  | 12 months or longer |  | Total
| # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
U.S. government agency securities | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | 217,175 |  |  | $ | (11,714) |  |  | $ | 217,175 |  |  | $ | (11,714) |
U.S. treasury securities | 10 |  |  | — |  |  | — |  |  | 460,467 |  |  | (18,231) |  |  | 460,467 |  |  | (18,231) |
Agency mortgage-backed securities | 111 |  |  | 96,770 |  |  | (481) |  |  | 292,217 |  |  | (24,222) |  |  | 388,987 |  |  | (24,703) |
Agency collateralized mortgage obligations | 57 |  |  | 180,392 |  |  | (3,116) |  |  | 24,341 |  |  | (1,514) |  |  | 204,733 |  |  | (4,630) |
Taxable municipal securities | 18 |  |  | 15,952 |  |  | (67) |  |  | — |  |  | — |  |  | 15,952 |  |  | (67) |
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,040 |  |  | (80) |  |  | 1,040 |  |  | (80) |
Small business administration pooled securities | 8 |  |  | — |  |  | — |  |  | 38,577 |  |  | (5,179) |  |  | 38,577 |  |  | (5,179) |
Total | 214 |  |  | $ | 293,114 |  |  | $ | (3,664) |  |  | $ | 1,033,817 |  |  | $ | (60,940) |  |  | $ | 1,326,931 |  |  | $ | (64,604) |
| December 31, 2024
|  |  | Less than 12 months |  | 12 months or longer |  | Total
| # of holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
| (Dollars in thousands)
U.S. government agency securities | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | 209,660 |  |  | $ | (19,792) |  |  | $ | 209,660 |  |  | $ | (19,792) |
U.S. treasury securities | 13 |  |  | — |  |  | — |  |  | 592,001 |  |  | (36,016) |  |  | 592,001 |  |  | (36,016) |
Agency mortgage-backed securities | 117 |  |  | 127,152 |  |  | (2,867) |  |  | 249,098 |  |  | (34,915) |  |  | 376,250 |  |  | (37,782) |
Agency collateralized mortgage obligations | 11 |  |  | 1,153 |  |  | (4) |  |  | 26,890 |  |  | (2,170) |  |  | 28,043 |  |  | (2,174) |
Non-taxable municipal securities | 1 |  |  | 194 |  |  | (3) |  |  | — |  |  | — |  |  | 194 |  |  | (3) |
Pooled trust preferred securities issued by banks and insurers | 1 |  |  | — |  |  | — |  |  | 1,095 |  |  | (85) |  |  | 1,095 |  |  | (85) |
Small business administration pooled securities | 8 |  |  | — |  |  | — |  |  | 40,838 |  |  | (7,194) |  |  | 40,838 |  |  | (7,194) |
Total | 160 |  |  | $ | 128,499 |  |  | $ | (2,874) |  |  | $ | 1,119,582 |  |  | $ | (100,172) |  |  | $ | 1,248,081 |  |  | $ | (103,046) |
Debt Securities, Held-to-maturity [Table Text Block] | The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized at the dates indicated:
| September 30, 2025 |  | December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for credit losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for credit losses |  | Fair Value
| (Dollars in thousands)
U.S. treasury securities | $ | 100,851 |  |  | $ | — |  |  | $ | (4,527) |  |  | $ | — |  |  | $ | 96,324 |  |  | $ | 100,791 |  |  | $ | — |  |  | $ | (7,769) |  |  | $ | — |  |  | $ | 93,022 |
Agency mortgage-backed securities | 759,083 |  |  | 240 |  |  | (40,093) |  |  | — |  |  | 719,230 |  |  | 788,470 |  |  | 90 |  |  | (62,198) |  |  | — |  |  | 726,362 |
Agency collateralized mortgage obligations | 382,615 |  |  | — |  |  | (47,949) |  |  | — |  |  | 334,666 |  |  | 422,827 |  |  | — |  |  | (65,143) |  |  | — |  |  | 357,684 |
Small business administration pooled securities | 115,068 |  |  | 65 |  |  | (4,601) |  |  | — |  |  | 110,532 |  |  | 122,868 |  |  | — |  |  | (8,135) |  |  | — |  |  | 114,733 |
Total held to maturity securities | $ | 1,357,617 |  |  | $ | 305 |  |  | $ | (97,170) |  |  | $ | — |  |  | $ | 1,260,752 |  |  | $ | 1,434,956 |  |  | $ | 90 |  |  | $ | (143,245) |  |  | $ | — |  |  | $ | 1,291,801 |
Schedule of contractual maturities of securities [Table Text Block] | A schedule of the contractual maturities of securities available for sale and securities held to maturity at September 30, 2025 is presented below:
| Due in one year or less |  | Due after one year to five years |  | Due after five to ten years |  | Due after ten years |  | Total
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (Dollars in thousands)
Available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities | $ | 30,286 |  |  | $ | 29,471 |  |  | $ | 198,603 |  |  | $ | 187,704 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 228,889 |  |  | $ | 217,175 |
U.S. treasury securities | 194,862 |  |  | 190,736 |  |  | 290,332 |  |  | 276,241 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 485,194 |  |  | 466,977 |
Agency mortgage-backed securities | 23,981 |  |  | 23,356 |  |  | 210,545 |  |  | 205,181 |  |  | 47,258 |  |  | 43,323 |  |  | 445,960 |  |  | 435,405 |  |  | 727,744 |  |  | 707,265 |
Agency collateralized mortgage obligations | 49 |  |  | 49 |  |  | — |  |  | — |  |  | 6,487 |  |  | 6,388 |  |  | 273,441 |  |  | 269,740 |  |  | 279,977 |  |  | 276,177 |
Non-taxable municipal securities | 2,690 |  |  | 2,692 |  |  | 7,811 |  |  | 7,816 |  |  | 4,110 |  |  | 4,157 |  |  | — |  |  | — |  |  | 14,611 |  |  | 14,665 |
Taxable municipal securities | 500 |  |  | 500 |  |  | 91,242 |  |  | 91,982 |  |  | 123,443 |  |  | 124,968 |  |  | 1,871 |  |  | 1,894 |  |  | 217,056 |  |  | 219,344 |
Pooled trust preferred securities issued by banks and insurers | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,120 |  |  | 1,040 |  |  | 1,120 |  |  | 1,040 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | 11,386 |  |  | 10,720 |  |  | 32,370 |  |  | 27,857 |  |  | 43,756 |  |  | 38,577 |
Total available for sale securities | $ | 252,368 |  |  | $ | 246,804 |  |  | $ | 798,533 |  |  | $ | 768,924 |  |  | $ | 192,684 |  |  | $ | 189,556 |  |  | $ | 754,762 |  |  | $ | 735,936 |  |  | $ | 1,998,347 |  |  | $ | 1,941,220 |
Held to maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | — |  |  | $ | — |  |  | $ | 99,857 |  |  | $ | 95,459 |  |  | $ | 994 |  |  | $ | 865 |  |  | $ | — |  |  | $ | — |  |  | $ | 100,851 |  |  | $ | 96,324 |
Agency mortgage-backed securities | 103,854 |  |  | 103,111 |  |  | 377,251 |  |  | 360,916 |  |  | 140,725 |  |  | 126,318 |  |  | 137,253 |  |  | 128,885 |  |  | 759,083 |  |  | 719,230 |
Agency collateralized mortgage obligations | 25,617 |  |  | 25,395 |  |  | 34,633 |  |  | 32,642 |  |  | 13,832 |  |  | 12,656 |  |  | 308,533 |  |  | 263,973 |  |  | 382,615 |  |  | 334,666 |
Small business administration pooled securities | — |  |  | — |  |  | — |  |  | — |  |  | 5,673 |  |  | 5,369 |  |  | 109,395 |  |  | 105,163 |  |  | 115,068 |  |  | 110,532 |
Total held to maturity securities | $ | 129,471 |  |  | $ | 128,506 |  |  | $ | 511,741 |  |  | $ | 489,017 |  |  | $ | 161,224 |  |  | $ | 145,208 |  |  | $ | 555,181 |  |  | $ | 498,021 |  |  | $ | 1,357,617 |  |  | $ | 1,260,752 |
Total | $ | 381,839 |  |  | $ | 375,310 |  |  | $ | 1,310,274 |  |  | $ | 1,257,941 |  |  | $ | 353,908 |  |  | $ | 334,764 |  |  | $ | 1,309,943 |  |  | $ | 1,233,957 |  |  | $ | 3,355,964 |  |  | $ | 3,201,972 |

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