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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Cumulative Roll Forward of Credit Losses Recognized in Earnings for Debt Securities Held and Not Intended to be Sold
There was no expected credit related impairment recognized on investment securities during the twelve months ended December 31, 2020. Prior to 2020, investment securities were evaluated for other-than-temporary impairment. During 2018, all of our pooled trust preferred collateralized debt obligations were liquidated either through a successful auction call or sale. Other-than-temporary impairment charges were recognized on the pooled trust preferred securities in 2008, 2009 and 2010. The following table provides a cumulative roll forward of credit losses recognized in earnings for the trust preferred securities for the years ended December 31:
 20192018
 (dollars in thousands)
Balance, beginning (a)$— $12,208 
Credit losses on debt securities for which other-than-temporary impairment was not previously recognized— — 
Additional credit losses on debt securities for which other-than-temporary impairment was previously recognized— — 
Increases in cash flows expected to be collected, recognized over the remaining life of the securities (b)— (223)
Reduction for debt securities sold during the period— (9,164)
Reduction for debt securities called during the period— (2,821)
Balance, ending$— $— 
(a)The beginning balance represents credit related losses included in other-than-temporary impairment charges recognized on debt securities in prior periods.
(b)Represents the increase in cash flows recognized either as principal payments or interest income during the period.
  
Held-to-maturity Securities
Below is an analysis of the amortized cost and fair values of debt securities held to maturity at December 31:
 20202019
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$2,766 $138 $— $2,904 $3,392 $57 $— $3,449 
Mortgage-Backed Securities – Commercial36,799 1,441 — 38,240 51,291 18 (184)51,125 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential277,351 5,389 (10)282,730 229,667 1,377 (294)230,750 
Mortgage-Backed Securities – Commercial9,737 344 — 10,081 12,081 67 — 12,148 
Obligations of States and Political Subdivisions34,391 705 — 35,096 40,092 554 — 40,646 
Debt Securities Issued by Foreign Governments800 — — 800 600 — — 600 
Total Securities Held to Maturity$361,844 $8,017 $(10)$369,851 $337,123 $2,073 $(478)$338,718 
  
Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale
Below is an analysis of the amortized cost and fair values of securities available for sale at December 31:
 20202019
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Residential$6,492 $738 $— $7,230 $7,745 $596 $— $8,341 
Mortgage-Backed Securities – Commercial182,823 8,357 — 191,180 186,316 2,983 (166)189,133 
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential481,109 14,924 — 496,033 660,777 4,113 (2,943)661,947 
Other Government-Sponsored Enterprises100,996 2 — 100,998 1,000 — — 1,000 
Obligations of States and Political Subdivisions11,154 243 — 11,397 17,738 171 — 17,909 
Corporate Securities22,941 1,444 — 24,385 22,919 1,043 — 23,962 
Total Securities Available for Sale$805,515 $25,708 $— $831,223 $896,495 $8,906 $(3,109)$902,292 
The amortized cost and estimated fair value of debt securities available for sale at December 31, 2020, by contractual maturity, are shown below:
Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due within 1 year$104,995 $105,015 
Due after 1 but within 5 years19,349 20,395 
Due after 5 but within 10 years10,747 11,370 
Due after 10 years— — 
135,091 136,780 
Mortgage-Backed Securities (a)670,424 694,443 
Total Debt Securities$805,515 $831,223 
(a)Mortgage Backed Securities include an amortized cost of $189.3 million and a fair value of $198.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $481.1 million and a fair value of $496.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
  
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale Mortgage Backed Securities include an amortized cost of $189.3 million and a fair value of $198.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $481.1 million and a fair value of $496.0 million  
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities held to maturity at December 31, 2020, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or repay obligations with or without call or prepayment penalties.
Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due within 1 year$2,500 $2,525 
Due after 1 but within 5 years7,669 7,742 
Due after 5 but within 10 years20,126 20,689 
Due after 10 years4,896 4,940 
35,191 35,896 
Mortgage-Backed Securities (a)326,653 333,955 
Total Debt Securities$361,844 $369,851 
(a)Mortgage Backed Securities include an amortized cost of $39.6 million and a fair value of $41.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $287.1 million and a fair value of $292.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The following table presents the gross unrealized losses and estimated fair values at December 31, 2020 for available for sale securities for which an allowance for credit losses has not been recorded and held to maturity securities by investment category and time frame for which the securities have been in a continuous unrealized loss position:
 Less Than 12 Months12 Months or MoreTotal
 Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses		Estimated
Fair Value		Gross
Unrealized
Losses
 (dollars in thousands)
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential3,755 (10)— — 3,755 (10)
Total Securities$3,755 $(10)$— $— $3,755 $(10)
The following table presents the gross unrealized losses and estimated fair value at December 31, 2019 for both available for sale and held to maturity securities by investment category and time frame for which the securities had been in a continuous unrealized loss position: 
 Less Than 12 Months 12 Months or More Total
 Estimated
Fair Value		Gross
Unrealized
Losses		 Estimated
Fair Value		Gross
Unrealized
Losses		 Estimated
Fair Value		Gross
Unrealized
Losses
 (dollars in thousands)
Obligations of U.S. Government Agencies:
Mortgage-Backed Securities – Commercial$54,501 $(201)$16,365 $(149)$70,866 $(350)
Obligations of U.S. Government-Sponsored Enterprises:
Mortgage-Backed Securities – Residential111,969 (436)219,015 (2,801)330,984 (3,237)
Total Securities$166,470 $(637)$235,380 $(2,950)$401,850 $(3,587)