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Securities (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2025202420252024
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$71 $(107)$169 $502 
Less: net gains recognized during the period on equity securities sold during the period— 3 6 438 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$71 $(110)$163 $64 
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:
 June 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$229,078 $— $(13,808)$— $215,270 $229,452 $— $(19,792)$— $209,660 
U.S. treasury securities528,500 — (22,797)— 505,703 628,017 — (36,016)— 592,001 
Agency mortgage-backed securities522,406 2,242 (27,312)— 497,336 415,918 25 (37,782)— 378,161 
Agency collateralized mortgage obligations28,834 2 (1,613)— 27,223 31,168 1 (2,174)— 28,995 
State, county, and municipal securities198 — (1)— 197 197 — (3)— 194 
Pooled trust preferred securities issued by banks and insurers 1,120 — (82)— 1,038 1,180 — (85)— 1,095 
Small business administration pooled securities45,195 — (5,644)— 39,551 48,032 — (7,194)— 40,838 
Total available for sale securities$1,355,331 $2,244 $(71,257)$— $1,286,318 $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:
 June 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 $— $— $215,270 $(13,808)$215,270 $(13,808)
U.S. treasury securities11 — — 505,703 (22,797)505,703 (22,797)
Agency mortgage-backed securities107 45,806 (940)248,583 (26,372)294,389 (27,312)
Agency collateralized mortgage obligations11 1,097 (3)25,253 (1,610)26,350 (1,613)
State, county, and municipal securities1 197 (1)— — 197 (1)
Pooled trust preferred securities issued by banks and insurers1 — — 1,038 (82)1,038 (82)
Small business administration pooled securities8 — — 39,551 (5,644)39,551 (5,644)
Total 148 $47,100 $(944)$1,035,398 $(70,313)$1,082,498 $(71,257)
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)
State, county, and 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:
 June 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$100,831 $— $(5,311)$— $95,520 $100,791 $— $(7,769)$— $93,022 
Agency mortgage-backed securities769,077 196 (45,623)— 723,650 788,470 90 (62,198)— 726,362 
Agency collateralized mortgage obligations395,526 — (53,103)— 342,423 422,827 — (65,143)— 357,684 
Small business administration pooled securities117,469 31 (5,403)— 112,097 122,868 — (8,135)— 114,733 
Total held to maturity securities$1,382,903 $227 $(109,440)$— $1,273,690 $1,434,956 $90 $(143,245)$— $1,291,801 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at June 30, 2025 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $229,078 $215,270 $— $— $— $— $229,078 $215,270 
U.S. treasury securities144,887 142,031 383,613 363,672 — — — — 528,500 505,703 
Agency mortgage-backed securities83 83 208,530 200,868 48,103 43,750 265,690 252,635 522,406 497,336 
Agency collateralized mortgage obligations— — — — 2,212 2,074 26,622 25,149 28,834 27,223 
State, county, and municipal securities— — 198 197 — — — — 198 197 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,120 1,038 1,120 1,038 
Small business administration pooled securities— — — — 11,565 10,785 33,630 28,766 45,195 39,551 
Total available for sale securities$144,970 $142,114 $821,419 $780,007 $61,880 $56,609 $327,062 $307,588 $1,355,331 $1,286,318 
Held to maturity securities
U.S. treasury securities$— $— $99,838 $94,664 $993 $856 $— $— $100,831 $95,520 
Agency mortgage-backed securities78,996 78,171 386,797 367,598 160,809 144,828 142,475 133,053 769,077 723,650 
Agency collateralized mortgage obligations— — 60,364 57,763 14,810 13,440 320,352 271,220 395,526 342,423 
Small business administration pooled securities— — — — 5,781 5,456 111,688 106,641 117,469 112,097 
Total held to maturity securities$78,996 $78,171 $546,999 $520,025 $182,393 $164,580 $574,515 $510,914 $1,382,903 $1,273,690 
Total$223,966 $220,285 $1,368,418 $1,300,032 $244,273 $221,189 $901,577 $818,502 $2,738,234 $2,560,008