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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The amortized cost and fair value of investments, which were classified as available for sale, are as follows:
 
As of December 31, 2020
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
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 
 
As of December 31, 2019
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair Value
U.S. Treasury securities$500,066 $35 $— $500,101 
Obligations of the U.S. government and agencies102,179 193 (352)102,020 
Obligations of state and political subdivisions5,366 13 — 5,379 
Mortgage-backed securities360,977 5,182 (157)366,002 
Collateralized mortgage obligations31,796 195 (159)31,832 
Collateralized loan obligations— — — — 
Corporate bonds— — — — 
Other investment securities650 — — 650 
Total$1,001,034 $5,618 $(668)$1,005,984 
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
The following tables present the aggregate amount of gross unrealized losses as of December 31, 2020 and December 31, 2019 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 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)
 
As of December 31, 2019
 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$48,497 $(315)$7,966 $(37)$56,463 $(352)
Mortgage-backed securities33,783 (119)5,977 (38)39,760 (157)
Collateralized mortgage obligations6,978 (67)10,861 (92)17,839 (159)
Total$89,258 $(501)$24,804 $(167)$114,062 $(668)
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 December 31, 2020 and December 31, 2019, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
 December 31, 2020December 31, 2019
(dollars in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Investment securities:    
Due in one year or less$502,465 $502,489 $504,851 $504,890 
Due after one year through five years18,679 19,167 38,710 38,623 
Due after five years through ten years77,433 77,681 53,598 53,457 
Due after ten years102,266 102,507 11,102 11,180 
Subtotal700,843 701,844 608,261 608,150 
Mortgage-related securities(1)
460,255 473,120 392,773 397,834 
Total$1,161,098 $1,174,964 $1,001,034 $1,005,984 
 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.
The amortized cost and fair value of held to maturity investment securities as of December 31, 2020 and December 31, 2019, by contractual maturity, are shown below:
 December 31, 2020December 31, 2019
(dollars in thousands)Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Mortgage-backed securities(1)
$14,759 $15,186 $12,577 $12,661 
 
(1) Expected maturities of mortgage-related securities may differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.
Debt Securities, Held-to-maturity
The amortized cost and fair value of investment securities held to maturity as of December 31, 2020 and December 31, 2019 are as follows:
 
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 
 
As of December 31, 2019
(dollars in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
 
Fair Value
Mortgage-backed securities$12,577 $104 $(20)$12,661 
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value
The following tables present the aggregate amount of gross unrealized losses as of December 31, 2020 and December 31, 2019 on held to maturity securities classified according to the amount of time those securities have been in a continuous unrealized loss position:

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)
 
As of December 31, 2019
 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$3,159 $(20)$— $— $3,159 $(20)