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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Value of Securities
The amortized cost and estimated fair value of AFS investment securities were as follows:
(Dollars in thousands)Amortized
Cost		Gross Unrealized
Gain		Gross Unrealized
Loss		Estimated
Fair Value
AFS investment securities:
December 31, 2022    
U.S. Treasury$49,156 $— $(2,139)$47,017 
Agency485,331 — (53,893)431,438 
Corporate586,652 — (44,104)542,548 
Collateralized mortgage obligations829,928 — (65,699)764,229 
Mortgage-backed securities953,678 — (137,897)815,781 
Total AFS investment securities$2,904,745 $— $(303,732)$2,601,013 
December 31, 2021
U.S. Treasury$57,708 $614 $(456)$57,866 
Agency440,183 2,081 (10,129)432,135 
Corporate451,621 6,096 (3,856)453,861 
Municipal bonds1,061,985 32,209 (4,281)1,089,913 
Collateralized mortgage obligations680,686 2,012 (6,055)676,643 
Mortgage-backed securities1,586,406 3,220 (26,180)1,563,446 
Total AFS investment securities$4,278,589 $46,232 $(50,957)$4,273,864 

The carrying amount and estimated fair value of HTM investment securities were as follows:
(Dollars in thousands)Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross Unrecognized
Gain		Gross Unrecognized
Loss		Estimated
Fair Value
HTM investment securities:    
December 31, 2022
Municipal bonds$1,148,055 $(43)$1,148,012 $44 $(257,430)$890,626 
Mortgage-backed securities231,692 — 231,692 — (33,621)198,071 
Other8,399 — 8,399 — — 8,399 
Total HTM investment securities$1,388,146 $(43)$1,388,103 $44 $(291,051)$1,097,096 
December 31, 2021
Municipal bonds$368,344 $(22)$368,322 $3,834 $(1,649)$370,507 
Mortgage-backed securities11,843 — 11,843 564 — 12,407 
Other1,509 — 1,509 — — 1,509 
Total HTM investment securities$381,696 $(22)$381,674 $4,398 $(1,649)$384,423 
Schedule of Number, Fair Value and Gross Unrealized Holding Losses of the Company's Investment Securities by Investment Category and Length of Time That the Securities Have Been in a Continuous Loss Position
The table below summarizes the number, fair value, and gross unrealized holding losses of the Company’s AFS investment securities in an unrealized loss position for which an allowance for credit losses has not been recorded as of the dates indicated, aggregated by investment category and length of time in a continuous loss position.

 December 31, 2022
 Less than 12 months12 months or LongerTotal
(Dollars in thousands)NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses
AFS investment securities:
U.S. Treasury5 $33,982 $(237)1 $13,036 $(1,902)6 $47,018 $(2,139)
Agency8 79,895 (1,265)35 351,543 (52,628)43 431,438 (53,893)
Corporate35 327,984 (20,840)21 214,565 (23,264)56 542,549 (44,104)
Collateralized mortgage obligations41 522,955 (33,318)40 241,229 (32,381)81 764,184 (65,699)
Mortgage-backed securities13 91,762 (6,987)68 724,019 (130,910)81 815,781 (137,897)
Total AFS investment securities102 $1,056,578 $(62,647)165 $1,544,392 $(241,085)267 $2,600,970 $(303,732)
 December 31, 2021
 Less than 12 months12 months or LongerTotal
(Dollars in thousands)NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses		NumberFair
Value		Gross
Unrealized
Losses
AFS investment securities:
U.S. Treasury3 $47,235 $(456)— $— $— 3 $47,235 $(456)
Agency19 278,078 (5,634)16 119,750 (4,495)35 397,828 (10,129)
Corporate17 166,563 (849)3 57,274 (3,007)20 223,837 (3,856)
Municipal bonds36 277,564 (4,079)2 6,596 (202)38 284,160 (4,281)
Collateralized mortgage obligations26 226,763 (3,738)15 121,185 (2,317)41 347,948 (6,055)
Mortgage-backed securities103 1,306,455 (20,417)15 173,121 (5,763)118 1,479,576 (26,180)
Total AFS investment securities204 $2,302,658 $(35,173)51 $477,926 $(15,784)255 $2,780,584 $(50,957)
Schedule of Allowance for Credit Losses on Company's Held-to-maturity Debt Securities The following table presents a rollforward by major security type of the ACL on the Company's HTM debt securities as of, and for the periods indicated:
For the Year Ended December 31, 2022
(Dollars in thousands)Balance, December 31, 2021Provision for Credit Losses Balance, December 31, 2022
HTM Investment securities:
Municipal bonds$22 $21 $43 
For the Year Ended December 31, 2021
(Dollars in thousands)Balance at December 31, 2020Provision for Credit Losses Balance, December 31, 2021
HTM Investment securities:
Municipal bonds$— $22 $22 
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale by Contractual Maturity
The amortized cost and fair value of investment securities at December 31, 2022, by contractual maturity, are shown in the table below.
Due in One Year
or Less		Due after One Year
through Five Years		Due after Five Years
through Ten Years		Due after
Ten Years		Total
(Dollars in thousands)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
AFS investment securities:          
Treasury$9,743 $9,701 $24,475 $24,280 $14,938 $13,036 $— $— $49,156 $47,017 
Agency25,575 25,281 326,466 299,758 96,148 78,702 37,142 27,697 485,331 431,438 
Corporate— — 283,332 273,415 303,320 269,133 — — 586,652 542,548 
Collateralized mortgage obligations34,473 34,192 66,535 64,986 202,571 180,391 526,349 484,660 829,928 764,229 
Mortgage-backed securities— — 34,922 34,258 519,895 454,049 398,861 327,474 953,678 815,781 
Total AFS investment securities69,791 69,174 735,730 696,697 1,136,872 995,311 962,352 839,831 2,904,745 2,601,013 
HTM investment securities:          
Municipal bonds— — 10,537 9,893 50,674 43,861 1,086,844 836,872 1,148,055 890,626 
Mortgage-backed securities— — — — — — 231,692 198,071 231,692 198,071 
Other— — — — — — 8,399 8,399 8,399 8,399 
Total HTM investment securities— — 10,537 9,893 50,674 43,861 1,326,935 1,043,342 1,388,146 1,097,096 
Total investment securities$69,791 $69,174 $746,267 $706,590 $1,187,546 $1,039,172 $2,289,287 $1,883,173 $4,292,891 $3,698,109 
Realized Gain (Loss) on Investments
The following table presents the amortized cost of securities sold with related gross realized gains, gross realized losses, and net realized (losses) gains for the periods indicated:

For the Year Ended December 31,
(Dollars in thousands)202220212020
Amortized cost of AFS investment securities sold$934,703 $884,231 $752,630 
Gross realized gains$13,645 $23,185 $15,682 
Gross realized losses(11,935)(6,279)(1,800)
Net realized gains on sales of AFS investment securities$1,710 $16,906 $13,882