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Securities (Tables)
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months Ended
March 31
20252024
Dollars in thousands
Net gains recognized during the period on equity securities$98 $609 
Less: net gains recognized during the period on equity securities sold during the period6 435 
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date$92 $174 
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:
 March 31, 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$229,264 $— $(15,997)$— $213,267 $229,452 $— $(19,792)$— $209,660 
U.S. treasury securities578,261 — (28,112)— 550,149 628,017 — (36,016)— 592,001 
Agency mortgage-backed securities479,789 1,033 (30,766)— 450,056 415,918 25 (37,782)— 378,161 
Agency collateralized mortgage obligations30,055 4 (1,771)— 28,288 31,168 1 (2,174)— 28,995 
State, county, and municipal securities197 — (2)— 195 197 — (3)— 194 
Pooled trust preferred securities issued by banks and insurers 1,180 — (85)— 1,095 1,180 — (85)— 1,095 
Small business administration pooled securities46,777 — (6,060)— 40,717 48,032 — (7,194)— 40,838 
Total available for sale securities$1,365,523 $1,037 $(82,793)$— $1,283,767 $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:
 March 31, 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 $— $— $213,267 $(15,997)$213,267 $(15,997)
U.S. treasury securities12 — — 550,149 (28,112)550,149 (28,112)
Agency mortgage-backed securities115 77,425 (1,406)250,191 (29,360)327,616 (30,766)
Agency collateralized mortgage obligations11 1,126 (3)26,236 (1,768)27,362 (1,771)
State, county, and municipal securities1 195 (2)— — 195 (2)
Pooled trust preferred securities issued by banks and insurers1 — — 1,095 (85)1,095 (85)
Small business administration pooled securities8 — — 40,717 (6,060)40,717 (6,060)
Total 157 $78,746 $(1,411)$1,081,655 $(81,382)$1,160,401 $(82,793)
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:
 March 31, 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$100,812 $— $(6,266)$— $94,546 $100,791 $— $(7,769)$— $93,022 
Agency mortgage-backed securities779,032 104 (51,897)— 727,239 788,470 90 (62,198)— 726,362 
Agency collateralized mortgage obligations410,186 — (57,431)— 352,755 422,827 — (65,143)— 357,684 
Small business administration pooled securities119,929 72 (5,408)— 114,593 122,868 — (8,135)— 114,733 
Total held to maturity securities$1,409,959 $176 $(121,002)$— $1,289,133 $1,434,956 $90 $(143,245)$— $1,291,801 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at March 31, 2025 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $229,264 $213,267 $— $— $— $— $229,264 $213,267 
U.S. treasury securities149,714 147,011 428,547 403,138 — — — — 578,261 550,149 
Agency mortgage-backed securities89 89 209,267 199,464 49,469 44,567 220,964 205,936 479,789 450,056 
Agency collateralized mortgage obligations— — — — 2,312 2,158 27,743 26,130 30,055 28,288 
State, county, and municipal securities— — 197 195 — — — — 197 195 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,180 1,095 1,180 1,095 
Small business administration pooled securities— — — — 3,013 2,801 43,764 37,916 46,777 40,717 
Total available for sale securities$149,803 $147,100 $867,275 $816,064 $54,794 $49,526 $293,651 $271,077 $1,365,523 $1,283,767 
Held to maturity securities
U.S. treasury securities$— $— $99,818 $93,703 $994 $843 $— $— $100,812 $94,546 
Agency mortgage-backed securities55,082 54,550 410,973 388,140 161,222 143,682 151,755 140,867 779,032 727,239 
Agency collateralized mortgage obligations— — 61,071 57,957 15,769 14,229 333,346 280,569 410,186 352,755 
Small business administration pooled securities— — — — 6,392 5,986 113,537 108,607 119,929 114,593 
Total held to maturity securities$55,082 $54,550 $571,862 $539,800 $184,377 $164,740 $598,638 $530,043 $1,409,959 $1,289,133 
Total$204,885 $201,650 $1,439,137 $1,355,864 $239,171 $214,266 $892,289 $801,120 $2,775,482 $2,572,900