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Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedNine Months Ended
September 30September 30
2021202020212020
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$(169)$308 695 (107)
Less: net gains recognized during the period on equity securities sold during the period50 — 191 6 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$(219)$308 $504 $(113)
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, 2021December 31, 2020
 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$217,613 $1,511 $(1,779)$— $217,345 $22,476 $1,640 $— $— $24,116 
U.S. treasury securities774,492 — (4,490)— 770,002 — — — — — 
Agency mortgage-backed securities294,387 6,120 (3,288)— 297,219 224,293 9,337 (1)— 233,629 
Agency collateralized mortgage obligations85,076 1,933 (522)— 86,487 88,687 3,083 (87)— 91,683 
State, county, and municipal securities276 12 — — 288 790 17 — — 807 
Single issuer trust preferred securities issued by banks489 2 — — 491 489 — (1)— 488 
Pooled trust preferred securities issued by banks and insurers 1,341 — (331)— 1,010 1,429 — (373)— 1,056 
Small business administration pooled securities51,718 2,650 — — 54,368 57,289 3,792 — — 61,081 
Total available for sale securities$1,425,392 $12,228 $(10,410)$— $1,427,210 $395,453 $17,869 $(462)$— $412,860 
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, 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 securities5 $138,262 $(1,779)$— $— $138,262 $(1,779)
U.S. treasury securities16 770,002 (4,490)— — 770,002 (4,490)
Agency mortgage-backed securities9 131,548 (3,287)304 (1)131,852 (3,288)
Agency collateralized mortgage obligations1 22,994 (522)— — 22,994 (522)
Pooled trust preferred securities issued by banks and insurers1 — — 1,010 (331)1,010 (331)
Total impaired available for sale securities32 $1,062,806 $(10,078)$1,314 $(332)$1,064,120 $(10,410)
December 31, 2020
Less than 12 months12 months or longerTotal
# of 
holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
(Dollars in thousands)
Agency mortgage-backed securities3 $437 $(1)$— $— $437 $(1)
Agency collateralized mortgage obligations2 23,323 (87)— — 23,323 (87)
Single issuer trust preferred securities issued by banks and insurers1 488 (1)— — 488 (1)
Pooled trust preferred securities issued by banks and insurers1 — — 1,056 (373)1,056 (373)
Total impaired available for sale securities7 $24,248 $(89)$1,056 $(373)$25,304 $(462)
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, 2021December 31, 2020
 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$33,422 $— $(127)$— $33,295 $— $— $— $— $— 
U.S. treasury securities3,007 17 — — 3,024 4,017 60 — — 4,077 
Agency mortgage-backed securities352,483 10,911 (2,781)— 360,613 356,085 18,036 — — 374,121 
Agency collateralized mortgage obligations451,151 5,089 (4,202)— 452,038 335,993 8,466 (340)— 344,119 
Single issuer trust preferred securities issued by banks1,500 8 — — 1,508 1,500 — (2)— 1,498 
Small business administration pooled securities23,686 1,142 — — 24,828 26,917 1,445 — — 28,362 
Total held to maturity securities$865,249 $17,167 $(7,110)$— $875,306 $724,512 $28,007 $(342)$— $752,177 
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, 2021 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$10,000 $10,066 $31,422 $31,275 $176,191 $176,004 $— $— $217,613 $217,345 
U.S. treasury securities— — 541,282 538,755 233,210 231,247 — — 774,492 770,002 
Agency mortgage-backed securities2,273 2,292 81,194 83,434 88,655 87,152 122,265 124,341 294,387 297,219 
Agency collateralized mortgage obligations— — — — — — 85,076 86,487 85,076 86,487 
State, county, and municipal securities85 85 — — 191 203 — — 276 288 
Single issuer trust preferred securities issued by banks— — — — — — 489 491 489 491 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,341 1,010 1,341 1,010 
Small business administration pooled securities— — — — — — 51,718 54,368 51,718 54,368 
Total available for sale securities$12,358 $12,443 $653,898 $653,464 $498,247 $494,606 $260,889 $266,697 $1,425,392 $1,427,210 
Held to maturity securities
U.S. government agency securities$— $— $33,422 $33,295 $— $— $— $— $33,422 $33,295 
U.S. treasury securities3,007 3,024 — — — — — — 3,007 3,024 
Agency mortgage-backed securities— — 3,482 3,677 125,204 125,407 223,797 231,529 352,483 360,613 
Agency collateralized mortgage obligations— — — — — — 451,151 452,038 451,151 452,038 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 23,686 24,828 23,686 24,828 
Total held to maturity securities$3,007 $3,024 $36,904 $36,972 $126,704 $126,915 $698,634 $708,395 $865,249 $875,306 
Total$15,365 $15,467 $690,802 $690,436 $624,951 $621,521 $959,523 $975,092 $2,290,641 $2,302,516