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Securities (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Securities Available-for-Sale
A summary of the Company's securities portfolio by category and maturity is presented in the following tables.
Securities Portfolio
(Dollar amounts in thousands)
 As of March 31, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$4,001 $15 $— $4,016 $12,001 $50 $— $12,051 
U.S. agency securities625,537 1,940 (31,897)595,580 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,400,613 19,026 (18,867)1,400,772 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		791,380 10,825 (7,425)794,780 566,830 14,650 (640)580,840 
Municipal securities220,516 9,180 (425)229,271 224,446 11,573 (4)236,015 
Corporate debt securities 165,576 5,489 (79)170,986 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,207,623 $46,475 $(58,693)$3,195,405 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,931 $— $(484)$11,447 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity(1)
(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,711 $— $(484)$11,227 $12,071 $— $(385)$11,686 
Equity Securities$96,983 $76,404 
Securities Held-to-Maturity
A summary of the Company's securities portfolio by category and maturity is presented in the following tables.
Securities Portfolio
(Dollar amounts in thousands)
 As of March 31, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$4,001 $15 $— $4,016 $12,001 $50 $— $12,051 
U.S. agency securities625,537 1,940 (31,897)595,580 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,400,613 19,026 (18,867)1,400,772 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		791,380 10,825 (7,425)794,780 566,830 14,650 (640)580,840 
Municipal securities220,516 9,180 (425)229,271 224,446 11,573 (4)236,015 
Corporate debt securities 165,576 5,489 (79)170,986 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,207,623 $46,475 $(58,693)$3,195,405 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,931 $— $(484)$11,447 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity(1)
(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,711 $— $(484)$11,227 $12,071 $— $(385)$11,686 
Equity Securities$96,983 $76,404 
Equity Securities
A summary of the Company's securities portfolio by category and maturity is presented in the following tables.
Securities Portfolio
(Dollar amounts in thousands)
 As of March 31, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$4,001 $15 $— $4,016 $12,001 $50 $— $12,051 
U.S. agency securities625,537 1,940 (31,897)595,580 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,400,613 19,026 (18,867)1,400,772 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		791,380 10,825 (7,425)794,780 566,830 14,650 (640)580,840 
Municipal securities220,516 9,180 (425)229,271 224,446 11,573 (4)236,015 
Corporate debt securities 165,576 5,489 (79)170,986 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,207,623 $46,475 $(58,693)$3,195,405 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,931 $— $(484)$11,447 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity(1)
(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,711 $— $(484)$11,227 $12,071 $— $(385)$11,686 
Equity Securities$96,983 $76,404 
Remaining Contractual Maturity of Securities
Remaining Contractual Maturity of Securities
(Dollar amounts in thousands)
 As of March 31, 2021
 Available-for-SaleHeld-to-Maturity
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
One year or less$83,624 $82,325 $1,972 $1,890 
After one year to five years200,410 197,296 4,379 4,199 
After five years to ten years731,596 720,232 2,650 2,540 
After ten years— — 2,710 2,598 
Securities that do not have a single contractual maturity date2,191,993 2,195,552 — — 
Total$3,207,623 $3,195,405 $11,711 $11,227 
Securities in an Unrealized Loss Position
The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of March 31, 2021 and December 31, 2020.
Securities in an Unrealized Loss Position
(Dollar amounts in thousands)
  Less Than 12 Months12 Months or LongerTotal
 Number of
Securities		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
As of March 31, 2021      
Securities Available-for-Sale
U.S. agency securities72 $416,937 $30,131 $43,055 $1,766 $459,992 $31,897 
CMOs125 572,968 18,814 2,916 53 575,884 18,867 
MBSs60 352,342 7,423 119 2 352,461 7,425 
Municipal securities28 18,532 417 1,747 8 20,279 425 
Corporate debt securities5 8,946 54 12,888 25 21,834 79 
Total290 $1,369,725 $56,839 $60,725 $1,854 $1,430,450 $58,693 
As of December 31, 2020       
Securities Available-for-Sale
U.S. agency securities48 $253,841 $4,764 $14,932 $212 $268,773 $4,976 
CMOs104 349,853 3,205 86,618 1,118 436,471 4,323 
MBSs19 69,838 550 12,307 90 82,145 640 
Municipal securities4 1,012 4 — — 1,012 4 
Corporate debt securities3 8,100 105 9,513 165 17,613 270 
Total178 $682,644 $8,628 $123,370 $1,585 $806,014 $10,213