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Securities (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedNine Months Ended
September 30September 30
2022202120222021
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$(742)$(169)(2,819)695 
Less: net gains recognized during the period on equity securities sold during the period— 50 8 191 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$(742)$(219)$(2,827)$504 
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, 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$231,122 $— $(31,180)$— $199,942 $217,393 $990 $(2,901)$— $215,482 
U.S. treasury securities873,891 — (89,433)— 784,458 873,467 172 (12,191)— 861,448 
Agency mortgage-backed securities393,296 50 (49,193)— 344,153 364,955 4,512 (5,534)— 363,933 
Agency collateralized mortgage obligations43,672 5 (2,890)— 40,787 78,966 1,282 (571)— 79,677 
State, county, and municipal securities193 — (6)— 187 192 11 — — 203 
Single issuer trust preferred securities issued by banks489 — — — 489 489 2 — — 491 
Pooled trust preferred securities issued by banks and insurers 1,202 — (203)— 999 1,199 — (199)— 1,000 
Small business administration pooled securities62,048 — (7,552)— 54,496 47,075 1,839 — — 48,914 
Total available for sale securities$1,605,913 $55 $(180,457)$— $1,425,511 $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:
 September 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 $80,353 $(11,483)$119,589 $(19,697)$199,942 $(31,180)
U.S. treasury securities18 86,592 (12,426)697,866 (77,007)784,458 (89,433)
Agency mortgage-backed securities142 263,358 (29,512)79,167 (19,681)342,525 (49,193)
Agency collateralized mortgage obligations11 39,291 (2,890)— — 39,291 (2,890)
State, county, and municipal securities1 187 (6)— — 187 (6)
Pooled trust preferred securities issued by banks and insurers1 — — 999 (203)999 (203)
Small business administration pooled securities8 36,885 (3,768)17,611 (3,784)54,496 (7,552)
Total impaired available for sale securities190 $506,666 $(60,085)$915,232 $(120,372)$1,421,898 $(180,457)
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:
 September 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$31,696 $— $(2,393)$— $29,303 $32,987 $— $(441)$— $32,546 
U.S. treasury securities100,615 — (12,623)— 87,992 102,560 6 (324)— 102,242 
Agency mortgage-backed securities892,102 149 (90,158)— 802,093 493,012 8,495 (4,271)— 497,236 
Agency collateralized mortgage obligations553,995 — (77,025)— 476,970 415,736 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 securities117,727 12 (5,620)— 112,119 21,023 733 — — 21,756 
Total held to maturity securities$1,697,635 $169 $(187,819)$— $1,509,985 $1,066,818 $12,474 $(15,159)$— $1,064,133 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of September 30, 2022 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $68,007 $60,786 $163,115 $139,156 $— $— $231,122 $199,942 
U.S. treasury securities— — 691,691 627,786 182,200 156,672 — — 873,891 784,458 
Agency mortgage-backed securities19,658 19,617 70,984 66,817 148,475 126,625 154,179 131,094 393,296 344,153 
Agency collateralized mortgage obligations— — — — — — 43,672 40,787 43,672 40,787 
State, county, and municipal securities— — 193 187 — — — — 193 187 
Single issuer trust preferred securities issued by banks— — — — — — 489 489 489 489 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,202 999 1,202 999 
Small business administration pooled securities— — — — — — 62,048 54,496 62,048 54,496 
Total available for sale securities$19,658 $19,617 $830,875 $755,576 $493,790 $422,453 $261,590 $227,865 $1,605,913 $1,425,511 
Held to maturity securities
U.S. government agency securities$— $— $31,696 $29,303 $— $— $— $— $31,696 $29,303 
U.S. treasury securities— — 49,766 44,047 50,849 43,945 — — 100,615 87,992 
Agency mortgage-backed securities228 226 190,333 182,141 478,115 415,833 223,426 203,893 892,102 802,093 
Agency collateralized mortgage obligations— — 29,998 28,550 36,791 31,784 487,206 416,636 553,995 476,970 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 117,727 112,119 117,727 112,119 
Total held to maturity securities$228 $226 $301,793 $284,041 $567,255 $493,070 $828,359 $732,648 $1,697,635 $1,509,985 
Total$19,886 $19,843 $1,132,668 $1,039,617 $1,061,045 $915,523 $1,089,949 $960,513 $3,303,548 $2,935,496