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Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedNine Months Ended
September 30September 30
2023202220232022
Dollars in thousands
Net (losses) gains recognized during the period on equity securities$(363)$(742)272 (2,819)
Less: net (losses) gains recognized during the period on equity securities sold during the period(34)— (33)8 
Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date$(329)$(742)$305 $(2,827)
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) as of the dates indicated:
 September 30, 2023December 31, 2022
 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$230,387 $— $(30,877)$— $199,510 $230,936 $— $(28,636)$— $202,300 
U.S. treasury securities874,463 — (75,576)— 798,887 874,035 — (82,694)— 791,341 
Agency mortgage-backed securities326,318 2 (51,612)— 274,708 359,068 54 (45,434)— 313,688 
Agency collateralized mortgage obligations37,159 — (3,510)— 33,649 41,874 — (3,031)— 38,843 
State, county, and municipal securities194 — (10)— 184 193 — (2)— 191 
Pooled trust preferred securities issued by banks and insurers 1,204 — (161)— 1,043 1,203 — (169)— 1,034 
Small business administration pooled securities54,830 — (9,067)— 45,763 59,470 — (7,713)— 51,757 
Total available for sale securities$1,524,555 $2 $(170,813)$— $1,353,744 $1,566,779 $54 $(167,679)$— $1,399,154 
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, 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 $— $— $199,509 $(30,877)$199,509 $(30,877)
U.S. treasury securities18 — — 798,887 (75,576)798,887 (75,576)
Agency mortgage-backed securities133 3,182 (67)271,047 (51,545)274,229 (51,612)
Agency collateralized mortgage obligations13 2,530 (35)31,119 (3,475)33,649 (3,510)
State, county, and municipal securities1 184 (10)— — 184 (10)
Pooled trust preferred securities issued by banks and insurers1 — — 1,043 (161)1,043 (161)
Small business administration pooled securities8 — — 45,763 (9,067)45,763 (9,067)
Total impaired available for sale securities183 $5,896 $(112)$1,347,368 $(170,701)$1,353,264 $(170,813)
December 31, 2022
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 $60,575 $(7,292)$141,725 $(21,344)$202,300 $(28,636)
U.S. treasury securities18 43,035 (6,350)748,306 (76,344)791,341 (82,694)
Agency mortgage-backed securities123 155,944 (15,186)154,653 (30,248)310,597 (45,434)
Agency collateralized mortgage obligations13 38,843 (3,031)— — 38,843 (3,031)
State, county, and municipal securities1 191 (2)— — 191 (2)
Pooled trust preferred securities issued by banks and insurers1 — — 1,034 (169)1,034 (169)
Small business administration pooled securities8 34,511 (3,550)17,246 (4,163)51,757 (7,713)
Total impaired available for sale securities173 $333,099 $(35,411)$1,062,964 $(132,268)$1,396,063 $(167,679)
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, 2023December 31, 2022
 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$29,961 $— $(1,619)$— $28,342 $31,258 $— $(2,222)$— $29,036 
U.S. treasury securities100,693 — (12,362)— 88,331 100,634 — (11,755)— 88,879 
Agency mortgage-backed securities839,945 5 (97,955)— 741,995 898,927 408 (83,383)— 815,952 
Agency collateralized mortgage obligations490,011 — (85,867)— 404,144 535,971 — (77,554)— 458,417 
Single issuer trust preferred securities issued by banks1,500 — (165)— 1,335 1,500 8 — — 1,508 
Small business administration pooled securities132,169 — (11,886)— 120,283 136,830 313 (6,225)— 130,918 
Total held to maturity securities$1,594,279 $5 $(209,854)$— $1,384,430 $1,705,120 $729 $(181,139)$— $1,524,710 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of September 30, 2023 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $166,540 $145,530 $63,847 $53,980 $— $— $230,387 $199,510 
U.S. treasury securities199,926 195,410 674,537 603,477 — — — — 874,463 798,887 
Agency mortgage-backed securities7,100 7,047 87,234 77,321 95,989 79,094 135,995 111,246 326,318 274,708 
Agency collateralized mortgage obligations— — — — 3,010 2,681 34,149 30,968 37,159 33,649 
State, county, and municipal securities— — 194 184 — — — — 194 184 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,204 1,043 1,204 1,043 
Small business administration pooled securities— — — — — — 54,830 45,763 54,830 45,763 
Total available for sale securities$207,026 $202,457 $928,505 $826,512 $162,846 $135,755 $226,178 $189,020 $1,524,555 $1,353,744 
Held to maturity securities
U.S. government agency securities$— $— $29,961 $28,342 $— $— $— $— $29,961 $28,342 
U.S. treasury securities— — 99,701 87,547 992 784 — — 100,693 88,331 
Agency mortgage-backed securities— — 303,005 279,374 333,049 280,954 203,891 181,667 839,945 741,995 
Agency collateralized mortgage obligations— — 43,985 40,115 40,959 35,101 405,067 328,928 490,011 404,144 
Single issuer trust preferred securities issued by banks— — 1,500 1,335 — — — — 1,500 1,335 
Small business administration pooled securities— — — — 6,305 5,628 125,864 114,655 132,169 120,283 
Total held to maturity securities$— $— $478,152 $436,713 $381,305 $322,467 $734,822 $625,250 $1,594,279 $1,384,430 
Total$207,026 $202,457 $1,406,657 $1,263,225 $544,151 $458,222 $961,000 $814,270 $3,118,834 $2,738,174