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Securities (Tables)
 6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2023202220232022
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$267 $(1,450)635 (2,077)
Less: net gains recognized during the period on equity securities sold during the period— 4 1 8 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$267 $(1,454)$634 $(2,085)
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:
 June 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$230,570 $— $(28,079)$— $202,491 $230,936 $— $(28,636)$— $202,300 
U.S. treasury securities874,319 — (76,458)— 797,861 874,035 — (82,694)— 791,341 
Agency mortgage-backed securities332,086 23 (44,691)— 287,418 359,068 54 (45,434)— 313,688 
Agency collateralized mortgage obligations38,901 — (3,116)— 35,785 41,874 — (3,031)— 38,843 
State, county, and municipal securities194 — (4)— 190 193 — (2)— 191 
Pooled trust preferred securities issued by banks and insurers 1,205 — (180)— 1,025 1,203 — (169)— 1,034 
Small business administration pooled securities56,061 — (7,928)— 48,133 59,470 — (7,713)— 51,757 
Total available for sale securities$1,533,336 $23 $(160,456)$— $1,372,903 $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:
 June 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 $— $— $202,491 $(28,079)$202,491 $(28,079)
U.S. treasury securities18 — — 797,861 (76,458)797,861 (76,458)
Agency mortgage-backed securities135 10,660 (464)275,316 (44,227)285,976 (44,691)
Agency collateralized mortgage obligations13 2,701 (41)33,085 (3,075)35,786 (3,116)
State, county, and municipal securities1 190 (4)— — 190 (4)
Pooled trust preferred securities issued by banks and insurers1 — — 1,025 (180)1,025 (180)
Small business administration pooled securities8 3,593 (274)44,539 (7,654)48,132 (7,928)
Total impaired available for sale securities185 $17,144 $(783)$1,354,317 $(159,673)$1,371,461 $(160,456)
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:
 June 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$30,395 $— $(1,907)$— $28,488 $31,258 $— $(2,222)$— $29,036 
U.S. treasury securities100,673 — (11,509)— 89,164 100,634 — (11,755)— 88,879 
Agency mortgage-backed securities851,418 15 (82,235)— 769,198 898,927 408 (83,383)— 815,952 
Agency collateralized mortgage obligations506,591 — (77,944)— 428,647 535,971 — (77,554)— 458,417 
Single issuer trust preferred securities issued by banks1,500 — (131)— 1,369 1,500 8 — — 1,508 
Small business administration pooled securities133,315 327 (6,424)— 127,218 136,830 313 (6,225)— 130,918 
Total held to maturity securities$1,623,892 $342 $(180,150)$— $1,444,084 $1,705,120 $729 $(181,139)$— $1,524,710 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of June 30, 2023 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $141,548 $125,881 $89,022 $76,610 $— $— $230,570 $202,491 
U.S. treasury securities149,901 145,725 674,982 608,868 49,436 43,268 — — 874,319 797,861 
Agency mortgage-backed securities7,144 7,024 87,582 78,115 96,895 81,586 140,465 120,693 332,086 287,418 
Agency collateralized mortgage obligations— — — — 3,305 2,981 35,596 32,804 38,901 35,785 
State, county, and municipal securities— — 194 190 — — — — 194 190 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,205 1,025 1,205 1,025 
Small business administration pooled securities— — — — — — 56,061 48,133 56,061 48,133 
Total available for sale securities$157,045 $152,749 $904,306 $813,054 $238,658 $204,445 $233,327 $202,655 $1,533,336 $1,372,903 
Held to maturity securities
U.S. government agency securities$— $— $30,395 $28,488 $— $— $— $— $30,395 $28,488 
U.S. treasury securities— — 99,681 88,340 992 824 — — 100,673 89,164 
Agency mortgage-backed securities23 23 278,067 259,168 356,972 309,733 216,356 200,274 851,418 769,198 
Agency collateralized mortgage obligations— — 29,508 27,911 38,560 33,774 438,523 366,962 506,591 428,647 
Single issuer trust preferred securities issued by banks— — 1,500 1,369 — — — — 1,500 1,369 
Small business administration pooled securities— — — — 6,303 5,680 127,012 121,538 133,315 127,218 
Total held to maturity securities$23 $23 $439,151 $405,276 $402,827 $350,011 $781,891 $688,774 $1,623,892 $1,444,084 
Total$157,068 $152,772 $1,343,457 $1,218,330 $641,485 $554,456 $1,015,218 $891,429 $3,157,228 $2,816,987