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Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedNine Months Ended
September 30September 30
2025202420252024
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 period12 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, 2025December 31, 2024
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. government agency securities$228,889 $— $(11,714)$— $217,175 $229,452 $— $(19,792)$— $209,660 
U.S. treasury securities485,194 14 (18,231)— 466,977 628,017 — (36,016)— 592,001 
Agency mortgage-backed securities727,744 4,224 (24,703)— 707,265 415,918 25 (37,782)— 378,161 
Agency collateralized mortgage obligations279,977 830 (4,630)— 276,177 31,168 1 (2,174)— 28,995 
Non-taxable municipal securities14,611 54 — — 14,665 197 — (3)— 194 
Taxable municipal securities217,056 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 securities43,756 — (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 months12 months or longerTotal
 # of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
 (Dollars in thousands)
U.S. government agency securities9 $— $— $217,175 $(11,714)$217,175 $(11,714)
U.S. treasury securities10 — — 460,467 (18,231)460,467 (18,231)
Agency mortgage-backed securities111 96,770 (481)292,217 (24,222)388,987 (24,703)
Agency collateralized mortgage obligations57 180,392 (3,116)24,341 (1,514)204,733 (4,630)
Taxable municipal securities18 15,952 (67)— — 15,952 (67)
Pooled trust preferred securities issued by banks and insurers1 — — 1,040 (80)1,040 (80)
Small business administration pooled securities8 — — 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 months12 months or longerTotal
# of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
U.S. government agency securities9 $— $— $209,660 $(19,792)$209,660 $(19,792)
U.S. treasury securities13 — — 592,001 (36,016)592,001 (36,016)
Agency mortgage-backed securities117 127,152 (2,867)249,098 (34,915)376,250 (37,782)
Agency collateralized mortgage obligations11 1,153 (4)26,890 (2,170)28,043 (2,174)
Non-taxable municipal securities1 194 (3)— — 194 (3)
Pooled trust preferred securities issued by banks and insurers1 — — 1,095 (85)1,095 (85)
Small business administration pooled securities8 — — 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, 2025December 31, 2024
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value
 (Dollars in thousands)
U.S. treasury securities$100,851 $— $(4,527)$— $96,324 $100,791 $— $(7,769)$— $93,022 
Agency mortgage-backed securities759,083 240 (40,093)— 719,230 788,470 90 (62,198)— 726,362 
Agency collateralized mortgage obligations382,615 — (47,949)— 334,666 422,827 — (65,143)— 357,684 
Small business administration pooled securities115,068 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 lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
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 securities194,862 190,736 290,332 276,241 — — — — 485,194 466,977 
Agency mortgage-backed securities23,981 23,356 210,545 205,181 47,258 43,323 445,960 435,405 727,744 707,265 
Agency collateralized mortgage obligations49 49 — — 6,487 6,388 273,441 269,740 279,977 276,177 
Non-taxable municipal securities2,690 2,692 7,811 7,816 4,110 4,157 — — 14,611 14,665 
Taxable municipal securities500 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 securities103,854 103,111 377,251 360,916 140,725 126,318 137,253 128,885 759,083 719,230 
Agency collateralized mortgage obligations25,617 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