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Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months Ended
March 31
20222021
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$(627)$316 
Less: net gains recognized during the period on equity securities sold during the period4 29 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$(631)$287 
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, 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$231,485 $44 $(15,594)$— $215,935 $217,393 $990 $(2,901)$— $215,482 
U.S. treasury securities873,608 — (51,275)— 822,333 873,467 172 (12,191)— 861,448 
Agency mortgage-backed securities421,751 670 (24,436)— 397,985 364,955 4,512 (5,534)— 363,933 
Agency collateralized mortgage obligations49,759 39 (796)— 49,002 78,966 1,282 (571)— 79,677 
State, county, and municipal securities192 8 — — 200 192 11 — — 203 
Single issuer trust preferred securities issued by banks489 — — — 489 489 2 — — 491 
Pooled trust preferred securities issued by banks and insurers 1,199 — (200)— 999 1,199 — (199)— 1,000 
Small business administration pooled securities68,455 48 (2,715)— 65,788 47,075 1,839 — — 48,914 
Total available for sale securities$1,646,938 $809 $(95,016)$— $1,552,731 $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:
 March 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 securities8 $180,613 $(13,459)$22,798 $(2,135)$203,411 $(15,594)
U.S. treasury securities18 822,333 (51,275)— — 822,333 (51,275)
Agency mortgage-backed securities73 242,172 (13,870)88,670 (10,566)330,842 (24,436)
Agency collateralized mortgage obligations10 45,455 (796)— — 45,455 (796)
Pooled trust preferred securities issued by banks and insurers1 — — 999 (200)999 (200)
Small business administration pooled securities7 60,416 (2,715)— — 60,416 (2,715)
Total impaired available for sale securities117 $1,350,989 $(82,115)$112,467 $(12,901)$1,463,456 $(95,016)
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:
 March 31, 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$32,555 $— $(1,574)$— $30,981 $32,987 $— $(441)$— $32,546 
U.S. treasury securities100,576 — (5,980)— 94,596 102,560 6 (324)— 102,242 
Agency mortgage-backed securities550,333 843 (29,993)— 521,183 493,012 8,495 (4,271)— 497,236 
Agency collateralized mortgage obligations576,964 189 (34,587)— 542,566 415,736 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 securities20,513 — (409)— 20,104 21,023 733 — — 21,756 
Total held to maturity securities$1,282,441 $1,040 $(72,543)$— $1,210,938 $1,066,818 $12,474 $(15,159)$— $1,064,133 
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of March 31, 2022 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $68,071 $64,776 $163,414 $151,159 $— $— $231,485 $215,935 
U.S. treasury securities— — 643,018 607,500 230,590 214,833 — — 873,608 822,333 
Agency mortgage-backed securities19,824 19,844 80,449 78,736 158,349 144,812 163,129 154,593 421,751 397,985 
Agency collateralized mortgage obligations— — — — — — 49,759 49,002 49,759 49,002 
State, county, and municipal securities— — 192 200 — — — — 192 200 
Single issuer trust preferred securities issued by banks— — — — — — 489 489 489 489 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,199 999 1,199 999 
Small business administration pooled securities— — — — — — 68,455 65,788 68,455 65,788 
Total available for sale securities$19,824 $19,844 $791,730 $751,212 $552,353 $510,804 $283,031 $270,871 $1,646,938 $1,552,731 
Held to maturity securities
U.S. government agency securities$— $— $32,555 $30,981 $— $— $— $— $32,555 $30,981 
U.S. treasury securities— — 49,740 46,985 50,836 47,611 — — 100,576 94,596 
Agency mortgage-backed securities— — 32,356 32,265 349,842 325,374 168,135 163,544 550,333 521,183 
Agency collateralized mortgage obligations— — — — 34,215 32,252 542,749 510,314 576,964 542,566 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 20,513 20,104 20,513 20,104 
Total held to maturity securities$— $— $114,651 $110,231 $436,393 $406,745 $731,397 $693,962 $1,282,441 $1,210,938 
Total$19,824 $19,844 $906,381 $861,443 $988,746 $917,549 $1,014,428 $964,833 $2,929,379 $2,763,669