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Securities (Tables)
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months Ended
March 31
20242023
Dollars in thousands
Net gains recognized during the period on equity securities$609 $368 
Less: net gains recognized during the period on equity securities sold during the period435 1 
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date$174 $367 
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, 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$230,013 $— $(24,337)$— $205,676 $230,198 $— $(23,060)$— $207,138 
U.S. treasury securities774,714 — (55,876)— 718,838 824,597 — (55,495)— 769,102 
Agency mortgage-backed securities309,560 25 (38,980)— 270,605 314,269 24 (37,246)— 277,047 
Agency collateralized mortgage obligations34,644 — (2,556)— 32,088 35,713 6 (2,530)— 33,189 
State, county, and municipal securities195 — (4)— 191 195 — (5)— 190 
Pooled trust preferred securities issued by banks and insurers 1,180 — (144)— 1,036 1,188 — (170)— 1,018 
Small business administration pooled securities52,083 — (7,686)— 44,397 53,702 — (7,130)— 46,572 
Total available for sale securities$1,402,389 $25 $(129,583)$— $1,272,831 $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:
 March 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 $— $— $205,676 $(24,337)$205,676 $(24,337)
U.S. treasury securities16 — — 718,838 (55,876)718,838 (55,876)
Agency mortgage-backed securities125 857 (8)267,985 (38,972)268,842 (38,980)
Agency collateralized mortgage obligations12 1,075 (11)31,013 (2,545)32,088 (2,556)
State, county, and municipal securities1 191 (4)— — 191 (4)
Pooled trust preferred securities issued by banks and insurers1 — — 1,036 (144)1,036 (144)
Small business administration pooled securities8 — — 44,397 (7,686)44,397 (7,686)
Total 172 $2,123 $(23)$1,268,945 $(129,560)$1,271,068 $(129,583)
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:
 March 31, 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$29,086 $— $(843)$— $28,243 $29,521 $— $(1,113)$— $28,408 
U.S. treasury securities100,732 — (9,922)— 90,810 100,712 — (9,177)— 91,535 
Agency mortgage-backed securities819,912 61 (71,372)— 748,601 829,431 175 (65,878)— 763,728 
Agency collateralized mortgage obligations465,016 — (71,758)— 393,258 477,517 — (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 securities129,021 — (7,684)— 121,337 130,426 384 (6,157)— 124,653 
Total held to maturity securities$1,545,267 $61 $(161,707)$— $1,383,621 $1,569,107 $559 $(152,058)$— $1,417,608 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of securities available for sale and securities held to maturity at March 31, 2024 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $199,221 $178,800 $30,792 $26,876 $— $— $230,013 $205,676 
U.S. treasury securities197,408 192,434 577,306 526,404 — — — — 774,714 718,838 
Agency mortgage-backed securities1 1 140,616 125,614 43,861 38,155 125,082 106,835 309,560 270,605 
Agency collateralized mortgage obligations— — — — 2,837 2,586 31,807 29,502 34,644 32,088 
State, county, and municipal securities— — 195 191 — — — — 195 191 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,180 1,036 1,180 1,036 
Small business administration pooled securities— — — — — — 52,083 44,397 52,083 44,397 
Total available for sale securities$197,409 $192,435 $917,338 $831,009 $77,490 $67,617 $210,152 $181,770 $1,402,389 $1,272,831 
Held to maturity securities
U.S. government agency securities$29,086 $28,243 $— $— $— $— $— $— $29,086 $28,243 
U.S. treasury securities— — 99,740 89,992 992 818 — — 100,732 90,810 
Agency mortgage-backed securities— — 448,783 414,620 181,710 159,656 189,419 174,325 819,912 748,601 
Agency collateralized mortgage obligations— — 63,456 58,528 19,228 16,930 382,332 317,800 465,016 393,258 
Single issuer trust preferred securities issued by banks— — 1,500 1,372 — — — — 1,500 1,372 
Small business administration pooled securities— — — — 7,688 7,048 121,333 114,289 129,021 121,337 
Total held to maturity securities$29,086 $28,243 $613,479 $564,512 $209,618 $184,452 $693,084 $606,414 $1,545,267 $1,383,621 
Total$226,495 $220,678 $1,530,817 $1,395,521 $287,108 $252,069 $903,236 $788,184 $2,947,656 $2,656,452