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Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months Ended
March 31
20212020
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$316 $(1,801)
Less: net gains recognized during the period on equity securities sold during the period29 6 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$287 $(1,807)
Schedule of Available-for-sale Securities Reconciliation [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, 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$169,091 $1,209 $(2,244)$— $168,056 $22,476 $1,640 $— $— $24,116 
Agency mortgage-backed securities286,512 7,561 (3,898)— 290,175 224,293 9,337 (1)— 233,629 
Agency collateralized mortgage obligations78,952 2,688 (11)— 81,629 88,687 3,083 (87)— 91,683 
State, county, and municipal securities540 15 — — 555 790 17 — — 807 
Single issuer trust preferred securities issued by banks489 — (1)— 488 489 — (1)— 488 
Pooled trust preferred securities issued by banks and insurers 1,412 — (348)— 1,064 1,429 — (373)— 1,056 
Small business administration pooled securities56,171 2,075 — — 58,246 57,289 3,792 — — 61,081 
Total available for sale securities$593,167 $13,548 $(6,502)$— $600,213 $395,453 $17,869 $(462)$— $412,860 
Available-for-sale Securities, Continuous 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, 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 securities4 $113,171 $(2,244)$— $— $113,171 $(2,244)
Agency mortgage-backed securities8 98,873 (3,898)— — 98,873 (3,898)
Agency collateralized mortgage obligations1 9,519 (11)— — 9,519 (11)
Single issuer trust preferred securities issued by banks and insurers1 — — 488 (1)488 (1)
Pooled trust preferred securities issued by banks and insurers1 — — 1,064 (348)1,064 (348)
Total impaired available for sale securities15 $221,563 $(6,153)$1,552 $(349)$223,115 $(6,502)
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:
 March 31, 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. Treasury securities$4,014 $43 $— $— $4,057 $4,017 $60 $— $— $4,077 
Agency mortgage-backed securities417,811 13,069 (4,252)— 426,628 356,085 18,036 — — 374,121 
Agency collateralized mortgage obligations355,686 7,474 (2,158)— 361,002 335,993 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 securities26,518 717 — — 27,235 26,917 1,445 — — 28,362 
Total held to maturity securities$805,529 $21,311 $(6,410)$— $820,430 $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 March 31, 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$10,001 $10,180 $— $— $159,090 $157,876 $— $— $169,091 $168,056 
Agency mortgage-backed securities— — 80,169 82,809 98,747 96,914 107,596 110,452 286,512 290,175 
Agency collateralized mortgage obligations— — — — — — 78,952 81,629 78,952 81,629 
State, county, and municipal securities350 351 — — 190 204 — — 540 555 
Single issuer trust preferred securities issued by banks— — — — — — 489 488 489 488 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,412 1,064 1,412 1,064 
Small business administration pooled securities— — — — — — 56,171 58,246 56,171 58,246 
Total available for sale securities$10,351 $10,531 $80,169 $82,809 $258,027 $254,994 $244,620 $251,879 $593,167 $600,213 
Held to maturity securities
U.S. Treasury securities$4,014 $4,057 $— $— $— $— $— $— $4,014 $4,057 
Agency mortgage-backed securities— — 4,614 4,869 128,958 127,901 284,239 293,858 417,811 426,628 
Agency collateralized mortgage obligations— — — — — — 355,686 361,002 355,686 361,002 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 26,518 27,235 26,518 27,235 
Total held to maturity securities$4,014 $4,057 $4,614 $4,869 $130,458 $129,409 $666,443 $682,095 $805,529 $820,430 
Total$14,365 $14,588 $84,783 $87,678 $388,485 $384,403 $911,063 $933,974 $1,398,696 $1,420,643