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Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2024202320242023
Dollars in thousands
Net (losses) gains recognized during the period on equity securities$(107)$267 502 635 
Less: net gains recognized during the period on equity securities sold during the period3 — 438 1 
Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date$(110)$267 $64 $634 
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, 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$229,828 $— $(23,946)$— $205,882 $230,198 $— $(23,060)$— $207,138 
U.S. treasury securities724,820 — (51,405)— 673,415 824,597 — (55,495)— 769,102 
Agency mortgage-backed securities304,616 18 (38,574)— 266,060 314,269 24 (37,246)— 277,047 
Agency collateralized mortgage obligations33,436 — (2,505)— 30,931 35,713 6 (2,530)— 33,189 
State, county, and municipal securities195 — (5)— 190 195 — (5)— 190 
Pooled trust preferred securities issued by banks and insurers 1,180 — (143)— 1,037 1,188 — (170)— 1,018 
Small business administration pooled securities50,781 — (7,640)— 43,141 53,702 — (7,130)— 46,572 
Total available for sale securities$1,344,856 $18 $(124,218)$— $1,220,656 $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:
 June 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 $— $— $205,882 $(23,946)$205,882 $(23,946)
U.S. treasury securities15 — — 673,415 (51,405)673,415 (51,405)
Agency mortgage-backed securities122 598 (4)263,528 (38,570)264,126 (38,574)
Agency collateralized mortgage obligations12 1,026 (4)29,906 (2,501)30,932 (2,505)
State, county, and municipal securities1 — — 190 (5)190 (5)
Pooled trust preferred securities issued by banks and insurers1 — — 1,037 (143)1,037 (143)
Small business administration pooled securities8 — — 43,141 (7,640)43,141 (7,640)
Total 168 $1,624 $(8)$1,217,099 $(124,210)$1,218,723 $(124,218)
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:
 June 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$28,655 $— $(549)$— $28,106 $29,521 $— $(1,113)$— $28,408 
U.S. treasury securities100,751 — (9,669)— 91,082 100,712 — (9,177)— 91,535 
Agency mortgage-backed securities809,636 71 (71,216)— 738,491 829,431 175 (65,878)— 763,728 
Agency collateralized mortgage obligations451,912 — (71,966)— 379,946 477,517 — (69,606)— 407,911 
Single issuer trust preferred securities issued by banks1,500 — (128)— 1,372 1,500 — (127)— 1,373 
Small business administration pooled securities127,201 — (8,329)— 118,872 130,426 384 (6,157)— 124,653 
Total held to maturity securities$1,519,655 $71 $(161,857)$— $1,357,869 $1,569,107 $559 $(152,058)$— $1,417,608 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at June 30, 2024 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $199,070 $179,101 $30,758 $26,781 $— $— $229,828 $205,882 
U.S. treasury securities197,104 191,812 527,716 481,603 — — — — 724,820 673,415 
Agency mortgage-backed securities— — 140,024 125,562 42,952 37,416 121,640 103,082 304,616 266,060 
Agency collateralized mortgage obligations— — — — 2,688 2,454 30,748 28,477 33,436 30,931 
State, county, and municipal securities— — 195 190 — — — — 195 190 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,180 1,037 1,180 1,037 
Small business administration pooled securities— — — — — — 50,781 43,141 50,781 43,141 
Total available for sale securities$197,104 $191,812 $867,005 $786,456 $76,398 $66,651 $204,349 $175,737 $1,344,856 $1,220,656 
Held to maturity securities
U.S. government agency securities$28,655 $28,106 $— $— $— $— $— $— $28,655 $28,106 
U.S. treasury securities— — 99,759 90,268 992 814 — — 100,751 91,082 
Agency mortgage-backed securities— — 463,862 429,532 163,010 141,624 182,764 167,335 809,636 738,491 
Agency collateralized mortgage obligations— — 63,317 58,403 18,813 16,623 369,782 304,920 451,912 379,946 
Single issuer trust preferred securities issued by banks— — 1,500 1,372 — — — — 1,500 1,372 
Small business administration pooled securities— — — — 7,222 6,626 119,979 112,246 127,201 118,872 
Total held to maturity securities$28,655 $28,106 $628,438 $579,575 $190,037 $165,687 $672,525 $584,501 $1,519,655 $1,357,869 
Total$225,759 $219,918 $1,495,443 $1,366,031 $266,435 $232,338 $876,874 $760,238 $2,864,511 $2,578,525