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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities
The amortized cost and fair value of investment securities available for sale as of June 30, 2021 and December 31, 2020 are as follows:
 
As of June 30, 2021
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized Losses
Fair
Value
U.S. Treasury securities$100 $— $— $100 
Obligations of the U.S. government and agencies117,543 660 (1,502)116,701 
Obligations of state and political subdivisions2,156 12 — 2,168 
Mortgage-backed securities474,153 9,969 (1,537)482,585 
Collateralized mortgage obligations14,687 458 — 15,145 
Collateralized loan obligations99,515 158 (38)99,635 
Corporate bonds11,000 754 — 11,754 
Other investment securities650 — — 650 
Total$719,804 $12,011 $(3,077)$728,738 
As of December 31, 2020
(dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized Losses
Fair
Value
U.S. Treasury securities$500,095 $5 $— $500,100 
Obligations of the U.S. government and agencies92,449 868 (219)93,098 
Obligations of state and political subdivisions2,149 22 — 2,171 
Mortgage-backed securities441,575 12,739 (457)453,857 
Collateralized mortgage obligations18,680 583 — 19,263 
Collateralized loan obligations94,500 1 (97)94,404 
Corporate bonds11,000 421 — 11,421 
Other investment securities650 — — 650 
Total$1,161,098 $14,639 $(773)$1,174,964 
Summary of Available-for-sale Debt Securities, Unrealized Loss Position, Fair Value
The following tables present the aggregate amount of gross unrealized losses as of June 30, 2021 and December 31, 2020 on available for sale investment securities classified according to the amount of time those securities have been in a continuous unrealized loss position:
 
As of June 30, 2021
 Less than 12
Months		12 Months
or Longer		Total
(dollars in thousands)Fair
Value		Unrealized LossesFair
Value		Unrealized LossesFair
Value		Unrealized Losses
Obligations of the U.S. government and agencies$70,508 $(1,502)$— $— $70,508 $(1,502)
Mortgage-backed securities196,757 (1,537)— — 196,757 (1,537)
Collateralized loan obligations18,962 (38)— — 18,962 (38)
Total$286,227 $(3,077)$— $— $286,227 $(3,077)
 
As of December 31, 2020
 Less than 12
Months		12 Months
or Longer		Total
(dollars in thousands)Fair
Value		Unrealized LossesFair
Value		Unrealized LossesFair
Value		Unrealized Losses
Obligations of the U.S. government and agencies$19,777 $(219)$— $— $19,777 $(219)
Mortgage-backed securities79,990 (457)— — 79,990 (457)
Collateralized loan obligations31,903 (97)— — 31,903 (97)
Total$131,670 $(773)$— $— $131,670 $(773)
Investments Classified by Contractual Maturity Date
The amortized cost and fair value of available for sale investment and mortgage-related securities available for sale as of June 30, 2021 and December 31, 2020, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 June 30,
2021		December 31,
2020
(dollars in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Investment securities:    
Due in one year or less$2,249 $2,253 $502,465 $502,489 
Due after one year through five years23,944 24,666 18,679 19,167 
Due after five years through ten years103,722 102,604 77,433 77,681 
Due after ten years101,049 101,485 102,266 102,507 
Subtotal230,964 231,008 700,843 701,844 
Mortgage-related securities(1)
488,840 497,730 460,255 473,120 
Total$719,804 $728,738 $1,161,098 $1,174,964 
 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
The amortized cost and fair value of held to maturity investment securities as of June 30, 2021 and December 31, 2020, by contractual maturity, are shown below:
 June 30,
2021		December 31,
2020
(dollars in thousands)Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Mortgage-backed securities(1)
$12,532 $12,761 $14,759 $15,186 
 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Summary of Held-to-maturity Debt Securities
The amortized cost and fair value of investment securities held to maturity as of June 30, 2021 and December 31, 2020 are as follows:
 
As of June 30, 2021
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair Value
Mortgage-backed securities$12,532 $352 $(123)$12,761 
 
As of December 31, 2020
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair Value
Mortgage-backed securities$14,759 $451 $(24)$15,186 
Summary of Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
The following table presents the aggregate amount of gross unrealized losses as of June 30, 2021 and December 31, 2020 on held to maturity securities classified according to the amount of time those securities have been in a continuous unrealized loss position:

As of June 30, 2021
 Less than 12
Months		12 Months
or Longer		Total
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Mortgage-backed securities$4,062 $(123)$— $— $4,062 $(123)
As of December 31, 2020
 Less than 12
Months		12 Months
or Longer		Total
(dollars in thousands)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Mortgage-backed securities$4,224 $(24)$— $— $4,224 $(24)