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Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
Three Months EndedSix Months Ended
June 30June 30
2021202020212020
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$548 $1,386 864 (415)
Less: net gains recognized during the period on equity securities sold during the period112 — 141 6 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$436 $1,386 $723 $(421)
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:
 June 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$192,829 $2,080 $(867)$— $194,042 $22,476 $1,640 $— $— $24,116 
U.S. treasury securities132,247 136 (32)— 132,351 — — — — — 
Agency mortgage-backed securities308,670 7,256 (1,830)— 314,096 224,293 9,337 (1)— 233,629 
Agency collateralized mortgage obligations93,307 2,535 (5)— 95,837 88,687 3,083 (87)— 91,683 
State, county, and municipal securities541 14 — — 555 790 17 — — 807 
Single issuer trust preferred securities issued by banks489 1 — — 490 489 — (1)— 488 
Pooled trust preferred securities issued by banks and insurers 1,409 — (348)— 1,061 1,429 — (373)— 1,056 
Small business administration pooled securities52,869 3,215 — — 56,084 57,289 3,792 — — 61,081 
Total available for sale securities$782,361 $15,237 $(3,082)$— $794,516 $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:
 June 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 securities4 $114,362 $(867)$— $— $114,362 $(867)
U.S. treasury securities1 35,115 (32)— — 35,115 (32)
Agency mortgage-backed securities9 134,589 (1,829)287 (1)134,876 (1,830)
Agency collateralized mortgage obligations1 7,240 (5)— — 7,240 (5)
Pooled trust preferred securities issued by banks and insurers1 — — 1,061 (348)1,061 (348)
Total impaired available for sale securities16 $291,306 $(2,733)$1,348 $(349)$292,654 $(3,082)
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:
 June 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$33,853 $— $(123)$— $33,730 $— $— $— $— $— 
U.S. treasury securities3,010 28 — — 3,038 4,017 60 — — 4,077 
Agency mortgage-backed securities381,030 12,507 (1,495)— 392,042 356,085 18,036 — — 374,121 
Agency collateralized mortgage obligations418,112 6,347 (2,618)— 421,841 335,993 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 securities24,316 1,326 — — 25,642 26,917 1,445 — — 28,362 
Total held to maturity securities$861,821 $20,216 $(4,236)$— $877,801 $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 June 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 $10,123 $— $— $182,829 $183,919 $— $— $192,829 $194,042 
U.S. treasury securities— — — — 132,247 132,351 — — 132,247 132,351 
Agency mortgage-backed securities— — 80,105 82,563 97,297 97,247 131,268 134,286 308,670 314,096 
Agency collateralized mortgage obligations— — — — — — 93,307 95,837 93,307 95,837 
State, county, and municipal securities350 351 — — 191 204 — — 541 555 
Single issuer trust preferred securities issued by banks— — — — — — 489 490 489 490 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,409 1,061 1,409 1,061 
Small business administration pooled securities— — — — — — 52,869 56,084 52,869 56,084 
Total available for sale securities$10,350 $10,474 $80,105 $82,563 $412,564 $413,721 $279,342 $287,758 $782,361 $794,516 
Held to maturity securities
U.S. government agency securities$— $— $33,853 $33,730 $— $— $— $— $33,853 $33,730 
U.S. treasury securities3,010 3,038 — — — — — — 3,010 3,038 
Agency mortgage-backed securities— — 3,995 4,221 124,640 126,003 252,395 261,818 381,030 392,042 
Agency collateralized mortgage obligations— — — — — — 418,112 421,841 418,112 421,841 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,508 — — 1,500 1,508 
Small business administration pooled securities— — — — — — 24,316 25,642 24,316 25,642 
Total held to maturity securities$3,010 $3,038 $37,848 $37,951 $126,140 $127,511 $694,823 $709,301 $861,821 $877,801 
Total$13,360 $13,512 $117,953 $120,514 $538,704 $541,232 $974,165 $997,059 $1,644,182 $1,672,317