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Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2022202120222021
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$(1,450)$548 (2,077)864 
Less: net gains recognized during the period on equity securities sold during the period4 112 8 141 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$(1,454)$436 $(2,085)$723 
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, 2022December 31, 2021
 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)
Available for sale securities
U.S. government agency securities$231,304 $— $(21,849)$— $209,455 $217,393 $990 $(2,901)$— $215,482 
U.S. treasury securities873,748 — (64,650)— 809,098 873,467 172 (12,191)— 861,448 
Agency mortgage-backed securities409,695 246 (32,151)— 377,790 364,955 4,512 (5,534)— 363,933 
Agency collateralized mortgage obligations46,014 13 (1,550)— 44,477 78,966 1,282 (571)— 79,677 
State, county, and municipal securities192 5 — — 197 192 11 — — 203 
Single issuer trust preferred securities issued by banks489 — (21)— 468 489 2 — — 491 
Pooled trust preferred securities issued by banks and insurers 1,200 — (201)— 999 1,199 — (199)— 1,000 
Small business administration pooled securities64,248 — (4,783)— 59,465 47,075 1,839 — — 48,914 
Total available for sale securities$1,626,890 $264 $(125,205)$— $1,501,949 $1,583,736 $8,808 $(21,396)$— $1,571,148 
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, 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 $187,288 $(19,080)$22,167 $(2,769)$209,455 $(21,849)
U.S. treasury securities18 809,098 (64,649)— — 809,098 (64,649)
Agency mortgage-backed securities109 296,365 (22,055)58,480 (10,096)354,845 (32,151)
Agency collateralized mortgage obligations11 42,918 (1,550)— — 42,918 (1,550)
Single issuer trust preferred securities issued by banks and insurers1 468 (21)— — 468 (21)
Pooled trust preferred securities issued by banks and insurers1 — — 999 (201)999 (201)
Small business administration pooled securities8 59,465 (4,784)— — 59,465 (4,784)
Total impaired available for sale securities157 $1,395,602 $(112,139)$81,646 $(13,066)$1,477,248 $(125,205)
December 31, 2021
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 securities6 $160,913 $(2,901)$— $— $160,913 $(2,901)
U.S. treasury securities17 811,993 (12,191)— — 811,993 (12,191)
Agency mortgage-backed securities12 214,678 (5,534)— — 214,678 (5,534)
Agency collateralized mortgage obligations1 22,960 (571)— — 22,960 (571)
Pooled trust preferred securities issued by banks and insurers1 — — 1,000 (199)1,000 (199)
Total impaired available for sale securities37 $1,210,544 $(21,197)$1,000 $(199)$1,211,544 $(21,396)
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 in accumulated other comprehensive income (loss) as of the dates indicated:
 June 30, 2022December 31, 2021
 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$32,128 $— $(1,828)$— $30,300 $32,987 $— $(441)$— $32,546 
U.S. treasury securities100,595 — (8,608)— 91,987 102,560 6 (324)— 102,242 
Agency mortgage-backed securities631,754 90 (47,770)— 584,074 493,012 8,495 (4,271)— 497,236 
Agency collateralized mortgage obligations577,183 6 (52,195)— 524,994 415,736 3,232 (10,123)— 408,845 
Single issuer trust preferred securities issued by banks1,500 8 — — 1,508 1,500 8 — — 1,508 
Small business administration pooled securities65,029 251 (978)— 64,302 21,023 733 — — 21,756 
Total held to maturity securities$1,408,189 $355 $(111,379)$— $1,297,165 $1,066,818 $12,474 $(15,159)$— $1,064,133 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of June 30, 2022 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $68,039 $63,455 $163,265 $146,000 $— $— $231,304 $209,455 
U.S. treasury securities— — 691,675 644,791 182,073 164,307 — — 873,748 809,098 
Agency mortgage-backed securities19,719 19,704 79,853 77,570 151,425 136,691 158,698 143,825 409,695 377,790 
Agency collateralized mortgage obligations— — — — — — 46,014 44,477 46,014 44,477 
State, county, and municipal securities— — 192 197 — — — — 192 197 
Single issuer trust preferred securities issued by banks— — — — — — 489 468 489 468 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,200 999 1,200 999 
Small business administration pooled securities— — — — — — 64,248 59,465 64,248 59,465 
Total available for sale securities$19,719 $19,704 $839,759 $786,013 $496,763 $446,998 $270,649 $249,234 $1,626,890 $1,501,949 
Held to maturity securities
U.S. government agency securities$— $— $32,128 $30,300 $— $— $— $— $32,128 $30,300 
U.S. treasury securities— — 49,753 45,873 50,842 46,114 — — 100,595 91,987 
Agency mortgage-backed securities— — 83,789 82,561 388,941 352,477 159,024 149,036 631,754 584,074 
Agency collateralized mortgage obligations— — 30,155 29,906 35,635 32,474 511,393 462,614 577,183 524,994 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 65,029 64,302 65,029 64,302 
Total held to maturity securities$— $— $195,825 $188,640 $476,918 $432,573 $735,446 $675,952 $1,408,189 $1,297,165 
Total$19,719 $19,704 $1,035,584 $974,653 $973,681 $879,571 $1,006,095 $925,186 $3,035,079 $2,799,114