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Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedNine Months Ended
September 30September 30
2024202320242023
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$685 $(363)1,187 272 
Less: net gains (losses) recognized during the period on equity securities sold during the period81 (34)519 (33)
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$604 $(329)$668 $305 
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, 2024December 31, 2023
 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$229,642 $— $(16,558)$— $213,084 $230,198 $— $(23,060)$— $207,138 
U.S. treasury securities674,920 — (34,007)— 640,913 824,597 — (55,495)— 769,102 
Agency mortgage-backed securities346,931 60 (29,282)— 317,709 314,269 24 (37,246)— 277,047 
Agency collateralized mortgage obligations32,277 8 (1,646)— 30,639 35,713 6 (2,530)— 33,189 
State, county, and municipal securities196 — — — 196 195 — (5)— 190 
Pooled trust preferred securities issued by banks and insurers 1,180 — (153)— 1,027 1,188 — (170)— 1,018 
Small business administration pooled securities49,587 — (5,944)— 43,643 53,702 — (7,130)— 46,572 
Total available for sale securities$1,334,733 $68 $(87,590)$— $1,247,211 $1,459,862 $30 $(125,636)$— $1,334,256 
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, 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 $— $— $213,084 $(16,558)$213,084 $(16,558)
U.S. treasury securities14 — — 640,913 (34,007)640,913 (34,007)
Agency mortgage-backed securities104 47,479 (188)266,901 (29,094)314,380 (29,282)
Agency collateralized mortgage obligations9 — — 28,452 (1,646)28,452 (1,646)
Pooled trust preferred securities issued by banks and insurers1 — — 1,027 (153)1,027 (153)
Small business administration pooled securities8 — — 43,643 (5,944)43,643 (5,944)
Total 145 $47,479 $(188)$1,194,020 $(87,402)$1,241,499 $(87,590)
December 31, 2023
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 $— $— $207,138 $(23,060)$207,138 $(23,060)
U.S. treasury securities17 — — 769,102 (55,495)769,102 (55,495)
Agency mortgage-backed securities115 1,091 (11)273,447 (37,235)274,538 (37,246)
Agency collateralized mortgage obligations12 339 (2)31,682 (2,528)32,021 (2,530)
State, county, and municipal securities1 190 (5)— — 190 (5)
Pooled trust preferred securities issued by banks and insurers1 — — 1,018 (170)1,018 (170)
Small business administration pooled securities8 — — 46,572 (7,130)46,572 (7,130)
Total 163 $1,620 $(18)$1,328,959 $(125,618)$1,330,579 $(125,636)
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, 2024December 31, 2023
 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$28,218 $— $(156)$— $28,062 $29,521 $— $(1,113)$— $28,408 
U.S. treasury securities100,772 — (6,582)— 94,190 100,712 — (9,177)— 91,535 
Agency mortgage-backed securities798,919 644 (48,044)— 751,519 829,431 175 (65,878)— 763,728 
Agency collateralized mortgage obligations437,552 — (57,209)— 380,343 477,517 — (69,606)— 407,911 
Single issuer trust preferred securities issued by banks1,500 — (49)— 1,451 1,500 — (127)— 1,373 
Small business administration pooled securities125,354 482 (3,936)— 121,900 130,426 384 (6,157)— 124,653 
Total held to maturity securities$1,492,315 $1,126 $(115,976)$— $1,377,465 $1,569,107 $559 $(152,058)$— $1,417,608 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at September 30, 2024 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $229,642 $213,084 $— $— $— $— $229,642 $213,084 
U.S. treasury securities196,815 192,493 478,105 448,420 — — — — 674,920 640,913 
Agency mortgage-backed securities16 16 139,183 128,734 71,034 66,751 136,698 122,208 346,931 317,709 
Agency collateralized mortgage obligations— — — — 2,598 2,446 29,679 28,193 32,277 30,639 
State, county, and municipal securities— — 196 196 — — — — 196 196 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,180 1,027 1,180 1,027 
Small business administration pooled securities— — — — — — 49,587 43,643 49,587 43,643 
Total available for sale securities$196,831 $192,509 $847,126 $790,434 $73,632 $69,197 $217,144 $195,071 $1,334,733 $1,247,211 
Held to maturity securities
U.S. government agency securities$28,218 $28,062 $— $— $— $— $— $— $28,218 $28,062 
U.S. treasury securities— — 99,779 93,334 993 856 — — 100,772 94,190 
Agency mortgage-backed securities— — 463,840 441,693 158,938 142,894 176,141 166,932 798,919 751,519 
Agency collateralized mortgage obligations— — 63,176 60,049 17,779 16,183 356,597 304,111 437,552 380,343 
Single issuer trust preferred securities issued by banks— — 1,500 1,451 — — — — 1,500 1,451 
Small business administration pooled securities— — — — 7,076 6,643 118,278 115,257 125,354 121,900 
Total held to maturity securities$28,218 $28,062 $628,295 $596,527 $184,786 $166,576 $651,016 $586,300 $1,492,315 $1,377,465 
Total$225,049 $220,571 $1,475,421 $1,386,961 $258,418 $235,773 $868,160 $781,371 $2,827,048 $2,624,676