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Securities (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months Ended
March 31
20232022
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$368 $(627)
Less: net gains recognized during the period on equity securities sold during the period1 4 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$367 $(631)
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:
 March 31, 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$230,753 $— $(25,739)$— $205,014 $230,936 $— $(28,636)$— $202,300 
U.S. treasury securities874,177 — (69,490)— 804,687 874,035 — (82,694)— 791,341 
Agency mortgage-backed securities346,584 63 (40,625)— 306,022 359,068 54 (45,434)— 313,688 
Agency collateralized mortgage obligations40,483 — (2,594)— 37,889 41,874 — (3,031)— 38,843 
State, county, and municipal securities194 1 — — 195 193 — (2)— 191 
Pooled trust preferred securities issued by banks and insurers 1,203 — (161)— 1,042 1,203 — (169)— 1,034 
Small business administration pooled securities57,648 — (6,895)— 50,753 59,470 — (7,713)— 51,757 
Total available for sale securities$1,551,042 $64 $(145,504)$— $1,405,602 $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:
 March 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 $11,869 $(616)$193,145 $(25,123)$205,014 $(25,739)
U.S. treasury securities18 — — 804,687 (69,490)804,687 (69,490)
Agency mortgage-backed securities119 43,406 (2,007)259,616 (38,618)303,022 (40,625)
Agency collateralized mortgage obligations13 3,039 (32)34,851 (2,562)37,890 (2,594)
Pooled trust preferred securities issued by banks and insurers1 — — 1,042 (161)1,042 (161)
Small business administration pooled securities8 3,933 (201)46,820 (6,694)50,753 (6,895)
Total impaired available for sale securities168 $62,247 $(2,856)$1,340,161 $(142,648)$1,402,408 $(145,504)
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:
 March 31, 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$30,824 $— $(1,866)$— $28,958 $31,258 $— $(2,222)$— $29,036 
U.S. treasury securities100,654 — (9,936)— 90,718 100,634 — (11,755)— 88,879 
Agency mortgage-backed securities887,994 896 (73,336)— 815,554 898,927 408 (83,383)— 815,952 
Agency collateralized mortgage obligations521,621 — (71,197)— 450,424 535,971 — (77,554)— 458,417 
Single issuer trust preferred securities issued by banks1,500 8 — — 1,508 1,500 8 — — 1,508 
Small business administration pooled securities135,783 895 (4,336)— 132,342 136,830 313 (6,225)— 130,918 
Total held to maturity securities$1,678,376 $1,799 $(160,671)$— $1,519,504 $1,705,120 $729 $(181,139)$— $1,524,710 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of March 31, 2023 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $117,578 $106,039 $113,175 $98,975 $— $— $230,753 $205,014 
U.S. treasury securities99,915 97,018 689,740 632,502 84,522 75,167 — — 874,177 804,687 
Agency mortgage-backed securities7,201 7,051 97,586 89,002 98,048 84,449 143,749 125,520 346,584 306,022 
Agency collateralized mortgage obligations— — — — — — 40,483 37,889 40,483 37,889 
State, county, and municipal securities— — 194 195 — — — — 194 195 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,203 1,042 1,203 1,042 
Small business administration pooled securities— — — — — — 57,648 50,753 57,648 50,753 
Total available for sale securities$107,116 $104,069 $905,098 $827,738 $295,745 $258,591 $243,083 $215,204 $1,551,042 $1,405,602 
Held to maturity securities
U.S. government agency securities$— $— $30,824 $28,958 $— $— $— $— $30,824 $28,958 
U.S. treasury securities— — 99,663 89,875 991 843 — — 100,654 90,718 
Agency mortgage-backed securities81 80 215,084 204,705 446,707 398,228 226,122 212,541 887,994 815,554 
Agency collateralized mortgage obligations— — 29,669 28,418 38,862 34,561 453,090 387,445 521,621 450,424 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — 3,389 3,132 132,394 129,210 135,783 132,342 
Total held to maturity securities$81 $80 $375,240 $351,956 $491,449 $438,272 $811,606 $729,196 $1,678,376 $1,519,504 
Total$107,197 $104,149 $1,280,338 $1,179,694 $787,194 $696,863 $1,054,689 $944,400 $3,229,418 $2,925,106