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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities, Available-for-Sale, Investments Reconciliation The amortized cost and fair values of debt securities at December 31, 2020 and 2019 are summarized as follows:
 2020
(Dollars in thousands)Amortized
cost		Unrealized
gains		Unrealized
losses		Fair Value
Residential federal agency MBS(1)
$209,923 $6,339 $287 $215,975 
Commercial federal agency MBS(1)
102,468 7,726 — 110,194 
Taxable municipal securities135,117 9,293 3 144,407 
Tax-exempt municipal securities88,235 7,216 — 95,451 
Corporate bonds 10,448 828 — 11,276 
Subordinated corporate bonds5,000 — — 5,000 
Total debt securities, at fair value$551,191 $31,402 $290 $582,303 
 2019
(Dollars in thousands)Amortized
cost		Unrealized
gains		Unrealized
losses		Fair Value
Federal agency obligations(1)
$999 $5 $— $1,004 
Residential federal agency MBS(1)
190,392 2,599 333 192,658 
Commercial federal agency MBS(1)
111,182 3,453 — 114,635 
Taxable municipal securities79,095 2,726 134 81,687 
Tax-exempt municipal securities95,342 4,696 — 100,038 
Corporate bonds13,826 485 — 14,311 
CDs(2)
454 1 — 455 
Total debt securities, at fair value$491,290 $13,965 $467 $504,788 
 __________________________________________ 
(1)These categories may include investments issued or guaranteed by government sponsored enterprises such as Fannie Mae ("FNMA"), Freddie Mac ("FHLMC"), Federal Farm Credit Bank ("FFCB"), or one of several Federal Home Loan Banks, as well as, investments guaranteed by Ginnie Mae ("GNMA"), a wholly-owned government entity.
(2)CDs represent term deposits issued by banks that are subject to FDIC insurance and purchased on the open market.
Schedule of Unrealized Loss on Debt Securities, Available-for-Sale Investments
The following tables summarize debt securities with unrealized losses, due to the fair values having declined below the amortized costs of the individual investments, by the duration of their continuous unrealized loss positions at December 31, 2020 and 2019: 
 2020
 Less than 12 months12 months or longerTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		# of holdings
Residential federal agency MBS$51,396 $284 $2,107 $3 $53,503 $287 10 
Taxable municipal securities1,997 3 — — 1,997 3 4 
Total temporarily impaired debt securities$53,393 $287 $2,107 $3 $55,500 $290 14 
 2019
 Less than 12 months12 months or longerTotal
(Dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		# of holdings
Residential federal agency MBS$36,464 $263 $5,060 $70 $41,524 $333 11 
Taxable municipal securities16,826 134 — — 16,826 134 15 
Total temporarily impaired debt securities$53,290 $397 $5,060 $70 $58,350 $467 26 
Debt Securities, Available-for-Sale Investments Classified by Contractual Maturity Date
The contractual maturity distribution at December 31, 2020 of debt securities was as follows:
(Dollars in thousands)Amortized CostFair Value
Due in one year or less$3,044 $3,064 
Due after one, but within five years101,461 108,845 
Due after five, but within ten years173,137 187,404 
Due after ten years273,549 282,990 
Total debt securities$551,191 $582,303 
Schedule of Realized Gain (Loss) on Sales of Debt Securities, Available-for-Sale Investments
Sales of debt securities, for the years ended December 31, 2020, 2019, and 2018 are summarized as follows: 
(Dollars in thousands)202020192018
Amortized cost of debt securities sold(1)
$5,680 $11,621 $122,652 
Gross realized gains on sales(2)
227 149 25 
Gross realized losses on sales— (3)(2,975)
Total proceeds from sales of debt securities$5,907 $11,767 $119,702 
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(1) Amortized cost of investments sold is determined on a specific identification basis and includes pending trades based on trade date, if applicable.
(2) Immaterial amount of capital gain distributions realized from mutual funds included in 2018.
Gain (Loss) on Equity Securities
Gains and losses on equity securities at December 31, 2020 and December 31, 2019 are summarized as follows:
(Dollars in thousands)20202019
Unrealized (losses) gains recognized during the reporting period on equity securities still held at year end$(38)$208 
Less: Net (losses) gains realized on equity securities sold during the period(11)159 
Net (losses) gains recognized during the period on equity securities $(49)$367