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Securities (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block]
The following table represents a summary of the gains and losses that relate to equity securities for the periods indicated:
Three Months EndedNine Months Ended
September 30September 30
2020201920202019
Dollars in thousands
Net gains (losses) recognized during the period on equity securities$308 $211 (107)1,562 
Less: net gains recognized during the period on equity securities sold during the period— — 6 6 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date$308 $211 $(113)$1,556 
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:
 September 30, 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 securities2 399 (1)— — 399 (1)
Agency collateralized mortgage obligations2 27,269 (119)— — 27,269 (119)
Single issuer trust preferred securities issued by banks and insurers1 469 (20)— — 469 (20)
Pooled trust preferred securities issued by banks and insurers1 — — 1,021 (412)1,021 (412)
Total impaired available for sale securities6 $28,137 $(140)$1,021 $(412)$29,158 $(552)
Debt Securities, Held-to-maturity [Table Text Block]
The following table summarizes the amortized cost, fair value and allowance for credit losses of held to maturity securities and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) as of the dates indicated:
 September 30, 2020December 31, 2019
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
 (Dollars in thousands)
U.S. government agency securities$— $— $— $— $— $12,874 $123 $— $12,997 
U.S. Treasury securities4,021 79 — — 4,100 4,032 21 — 4,053 
Agency mortgage-backed securities388,106 19,687 — — 407,793 397,414 8,445 (57)405,802 
Agency collateralized mortgage obligations237,380 9,557 — — 246,937 293,662 4,501 (849)297,314 
Single issuer trust preferred securities issued by banks1,500 — (2)— 1,498 1,500 — (10)1,490 
Small business administration pooled securities28,566 1,573 — — 30,139 31,324 338 (55)31,607 
Total held to maturity securities$659,573 $30,896 $(2)$— $690,467 $740,806 $13,428 $(971)$753,263 
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block] s of September 30, 2020, all held to maturity securities held by the Company were rated investment grade or higher.
Schedule of contractual maturities of securities [Table Text Block] A schedule of the contractual maturities of available for sale and held to maturity securities as of September 30, 2020 is presented below:
Due in one year or lessDue after one year to five yearsDue after five to ten yearsDue after ten yearsTotal
Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
(Dollars in thousands)
Available for sale securities
U.S. government agency securities$— $— $10,001 $10,288 $12,474 $13,985 $— $— $22,475 $24,273 
Agency mortgage-backed securities— — 71,624 73,773 38,956 41,956 109,570 114,891 220,150 230,620 
Agency collateralized mortgage obligations— — — — — — 98,657 102,077 98,657 102,077 
State, county, and municipal securities515 516 420 422 190 207 — — 1,125 1,145 
Single issuer trust preferred securities issued by banks— — — — — — 489 469 489 469 
Pooled trust preferred securities issued by banks and insurers — — — — — — 1,433 1,021 1,433 1,021 
Small business administration pooled securities— — — — — — 59,830 63,873 59,830 63,873 
Total available for sale securities$515 $516 $82,045 $84,483 $51,620 $56,148 $269,979 $282,331 $404,159 $423,478 
Held to maturity securities
U.S. Treasury securities$1,001 $1,019 $3,020 $3,081 $— $— $— $— $4,021 $4,100 
Agency mortgage-backed securities8,510 8,574 1,458 1,509 53,530 56,289 324,608 341,421 388,106 407,793 
Agency collateralized mortgage obligations— — — — — — 237,380 246,937 237,380 246,937 
Single issuer trust preferred securities issued by banks— — — — 1,500 1,498 — — 1,500 1,498 
Small business administration pooled securities— — — — — — 28,566 30,139 28,566 30,139 
Total held to maturity securities$9,511 $9,593 $4,478 $4,590 $55,030 $57,787 $590,554 $618,497 $659,573 $690,467 
Total$10,026 $10,109 $86,523 $89,073 $106,650 $113,935 $860,533 $900,828 $1,063,732 $1,113,945 
Schedule of gross unrealized losses and fair value of investments [Table Text Block] The following table shows the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company had not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2019:
 December 31, 2019
  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 securities12 34,009 (59)243 (2)34,252 (61)
Agency collateralized mortgage obligations17 48,476 (215)37,382 (653)85,858 (868)
Single issuer trust preferred securities issued by banks and insurers1 — — 1,490 (10)1,490 (10)
Pooled trust preferred securities issued by banks and insurers1 — — 1,114 (374)1,114 (374)
Small business administration pooled securities1 7,349 (55)— — 7,349 (55)
Total temporarily impaired securities32 $89,834 $(329)$40,229 $(1,039)$130,063 $(1,368)
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:
 September 30, 2020December 31, 2019
 Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Allowance for credit lossesFair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
 (Dollars in thousands)
U.S. government agency securities$22,475 $1,798 $— $— $24,273 $32,473 $642 $— $33,115 
Agency mortgage-backed securities220,150 10,471 (1)— 230,620 243,548 3,456 (4)247,000 
Agency collateralized mortgage obligations98,657 3,539 (119)— 102,077 87,305 1,225 (19)88,511 
State, county, and municipal securities1,125 20 — — 1,145 1,377 19 — 1,396 
Single issuer trust preferred securities issued by banks489 — (20)— 469 488 5 — 493 
Pooled trust preferred securities issued by banks and insurers 1,433 — (412)— 1,021 1,488 — (374)1,114 
Small business administration pooled securities59,830 4,043 — — 63,873 54,024 771 — 54,795 
Total available for sale securities$404,159 $19,871 $(552)$— $423,478 $420,703 $6,118 $(397)$426,424