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Securities (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$1,000 $3 $— $1,003 $12,001 $50 $— $12,051 
U.S. agency securities612,173 1,996 (15,372)598,797 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,336,291 16,936 (13,601)1,339,626 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		808,967 9,762 (4,368)814,361 566,830 14,650 (640)580,840 
Municipal securities212,308 9,822 (229)221,901 224,446 11,573 (4)236,015 
Corporate debt securities 173,069 7,451 (14)180,506 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,143,808 $45,970 $(33,584)$3,156,194 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,593 $— $(468)$11,125 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity		(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,373 $— $(468)$10,905 $12,071 $— $(385)$11,686 
Equity Securities$112,977 $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 June 30, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$1,000 $3 $— $1,003 $12,001 $50 $— $12,051 
U.S. agency securities612,173 1,996 (15,372)598,797 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,336,291 16,936 (13,601)1,339,626 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		808,967 9,762 (4,368)814,361 566,830 14,650 (640)580,840 
Municipal securities212,308 9,822 (229)221,901 224,446 11,573 (4)236,015 
Corporate debt securities 173,069 7,451 (14)180,506 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,143,808 $45,970 $(33,584)$3,156,194 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,593 $— $(468)$11,125 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity		(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,373 $— $(468)$10,905 $12,071 $— $(385)$11,686 
Equity Securities$112,977 $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 June 30, 2021As of December 31, 2020
 Amortized CostGross UnrealizedFair
 Value		Amortized CostGross UnrealizedFair
 Value
 GainsLossesGainsLosses
Securities Available-for-Sale      
U.S. treasury securities$1,000 $3 $— $1,003 $12,001 $50 $— $12,051 
U.S. agency securities612,173 1,996 (15,372)598,797 654,321 3,129 (4,976)652,474 
Collateralized mortgage obligations
  ("CMOs")		1,336,291 16,936 (13,601)1,339,626 1,415,312 27,529 (4,323)1,438,518 
Other mortgage-backed securities
  ("MBSs")		808,967 9,762 (4,368)814,361 566,830 14,650 (640)580,840 
Municipal securities212,308 9,822 (229)221,901 224,446 11,573 (4)236,015 
Corporate debt securities 173,069 7,451 (14)180,506 170,570 6,210 (270)176,510 
Total securities available-for-sale$3,143,808 $45,970 $(33,584)$3,156,194 $3,043,480 $63,141 $(10,213)$3,096,408 
Securities Held-to-Maturity       
Municipal securities$11,593 $— $(468)$11,125 $12,291 $— $(385)$11,906 
Allowance for securities held-to-
  maturity		(220)$(220)(220)$(220)
Total securities held-to-maturity,
  net		$11,373 $— $(468)$10,905 $12,071 $— $(385)$11,686 
Equity Securities$112,977 $76,404 
Remaining Contractual Maturity of Securities
Remaining Contractual Maturity of Securities
(Dollar amounts in thousands)
 As of June 30, 2021
 Available-for-SaleHeld-to-Maturity
 Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
One year or less$94,281 $94,626 $1,971 $1,891 
After one year to five years176,306 176,952 4,335 4,160 
After five years to ten years727,963 730,629 2,658 2,551 
After ten years— — 2,629 2,523 
Securities that do not have a single contractual maturity date2,145,258 2,153,987 — — 
Total$3,143,808 $3,156,194 $11,593 $11,125 
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 June 30, 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 June 30, 2021      
Securities Available-for-Sale
U.S. agency securities64 $376,464 $13,721 $51,780 $1,651 $428,244 $15,372 
CMOs150 568,946 12,450 26,307 1,151 595,253 13,601 
MBSs62 265,493 3,739 31,417 629 296,910 4,368 
Municipal securities12 10,929 229 — — 10,929 229 
Corporate debt securities1 — — 3,212 14 3,212 14 
Total289 $1,221,832 $30,139 $112,716 $3,445 $1,334,548 $33,584 
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