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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of the portfolio of investment securities available-for-sale Marketable securities available-for-sale at December 31, 2022 are as follows:         
Amortized costGross unrealized
holding gains		Gross unrealized
holding losses		Fair value
Debt issued by the U.S. government and agencies:    
Due after one year through five years$20,000 — (1,799)18,201 
Due after ten years53,152 — (10,761)42,391 
Debt issued by government sponsored enterprises:
Due after one year through five years993 — (49)944 
Due after five years through ten years45,814 — (7,557)38,257 
Municipal securities:    
Due within one year506 — (1)505 
Due after one year through five years986 21 (13)994 
Due after five years through ten years36,332 — (2,290)34,042 
Due after ten years89,631 8 (13,414)76,225 
Corporate debt issues:    
Due after five years through ten years13,540 — (562)12,978 
Residential mortgage-backed securities:    
Fixed rate pass-through227,122 35 (31,171)195,986 
Variable rate pass-through8,837 10 (184)8,663 
Fixed rate agency CMOs906,962 — (145,284)761,678 
Variable rate agency CMOs27,853 31 (640)27,244 
Total residential mortgage-backed securities1,170,774 76 (177,279)993,571 
Total marketable securities available-for-sale$1,431,728 105 (213,725)1,218,108 
Marketable securities available-for-sale at December 31, 2021 are as follows:
Amortized costGross unrealized
holding gains		Gross unrealized
holding losses		Fair value
Debt issued by the U.S. government and agencies:    
Due after one year through five years$20,000 — (68)19,932 
Due after ten years57,681 — (1,722)55,959 
Debt issued by government-sponsored enterprises:    
Due within one year177 — — 177 
Due after one year through five years991 73 — 1,064 
Due after five years through ten years46,411 1 (1,568)44,844 
Municipal securities:    
Due within one year946 13 — 959 
Due after one year through five years1,261 22 (3)1,280 
Due after five years through ten years23,692 661 (146)24,207 
Due after ten years99,558 2,884 (187)102,255 
Residential mortgage-backed securities:    
Fixed rate pass-through265,604 2,389 (2,525)265,468 
Variable rate pass-through11,306 294 (9)11,591 
Fixed rate agency CMOs997,680 2,284 (18,965)980,999 
Variable rate agency CMOs39,695 224 (62)39,857 
Total residential mortgage-backed securities1,314,285 5,191 (21,561)1,297,915 
Total marketable securities available-for-sale$1,565,002 8,845 (25,255)1,548,592 
The following table shows the contractual maturity of our residential mortgage-backed securities available-for-sale at December 31, 2022:
Amortized costFair value
Residential mortgage-backed securities:
Due within one year$132 130 
Due after one year through five years32,192 29,538 
Due after five years through ten years46,188 43,438 
Due after ten years1,092,262 920,465 
Total residential mortgage-backed securities$1,170,774 993,571 
Schedule of the portfolio of investment securities held-to-maturity Marketable securities held-to-maturity at December 31, 2022 are as follows:     
Amortized costGross unrealized
holding gains		Gross unrealized
holding losses		Fair value
Debt issued by the U.S. government and agencies:    
Due after one year through five years$29,478 — (3,676)25,802 
Due after five years through ten years94,977 — (18,157)76,820 
Residential mortgage-backed securities:    
Fixed rate pass-through163,196 — (24,684)138,512 
Variable rate pass-through542 — (12)530 
Fixed rate agency CMOs592,527 — (83,325)509,202 
Variable rate agency CMOs529 — (11)518 
Total residential mortgage-backed securities756,794 — (108,032)648,762 
Total marketable securities held-to-maturity$881,249 — (129,865)751,384 
Marketable securities held-to-maturity at December 31, 2021 are as follows:     
Amortized costGross unrealized
holding gains		Gross unrealized
holding losses		Fair value
Debt issued by the U.S. government and agencies:    
Due after one year through five years$16,478 — (206)16,272 
Due after five years through ten years107,973 — (4,613)103,360 
Residential mortgage-backed securities:    
Fixed rate pass-through183,092 58 (2,161)180,989 
Variable rate pass-through667 24 — 691 
Fixed rate agency CMOs459,345 251 (10,011)449,585 
Variable rate agency CMOs599 17 — 616 
Total residential mortgage-backed securities643,703 350 (12,172)631,881 
Total marketable securities held-to-maturity$768,154 350 (16,991)751,513 
The following table shows the contractual maturity of our residential mortgage-backed securities held-to-maturity at December 31, 2022:
Amortized costFair value
Residential mortgage-backed securities:
Due after one year through five years$20,612 17,568 
Due after five years through ten years20,250 15,879 
Due after ten years715,932 615,315 
Total residential mortgage-backed securities$756,794 648,762 
Information regarding the issuers and the carrying values of the entity's mortgage-backed securities
The following table presents information regarding the issuers and the carrying values of our residential mortgage-backed securities at December 31, 2022 and 2021:
 December 31,
 20222021
Residential mortgage-backed securities:  
FNMA$651,404 704,070 
GNMA438,193 577,684 
FHLMC660,762 659,433 
Other (including non-agency)6 431 
Total residential mortgage-backed securities$1,750,365 1,941,618 
Schedule of the fair value and gross unrealized losses on investment securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position
The following table shows the fair value and gross unrealized losses on available for sale investment securities and held to maturity investment securities, for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at December 31, 2022: 
 Less than 12 months12 months or moreTotal
 Fair valueUnrealized
loss		Fair valueUnrealized
loss		Fair valueUnrealized
loss
U.S. government sponsored enterprises$1,735 (82)200,679 (41,917)202,414 (41,999)
Corporate debt issues12,979 (562)— — 12,979 (562)
Municipal securities60,676 (4,047)44,493 (11,671)105,169 (15,718)
Residential mortgage-backed securities373,186 (22,796)1,264,042 (262,515)1,637,228 (285,311)
Total temporarily impaired securities$448,576 (27,487)1,509,214 (316,103)1,957,790 (343,590)
 
The following table shows the fair value and gross unrealized losses on investment securities, for which an allowance for credit losses has not been recorded, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position at December 31, 2021:                                    
 Less than 12 months12 months or moreTotal
 Fair valueUnrealized
loss		Fair valueUnrealized
loss		Fair valueUnrealized
loss
U.S. government sponsored enterprises$132,782 (3,504)106,160 (4,673)238,942 (8,177)
Municipal securities25,118 (336)— — 25,118 (336)
Residential mortgage-backed securities1,428,582 (26,516)184,389 (7,217)1,612,971 (33,733)
Total temporarily impaired securities$1,586,482 (30,356)290,549 (11,890)1,877,031 (42,246)
Debt Securities, Held-to-maturity, Credit Quality Indicator
The following table presents the credit quality for our held-to-maturity securities, based on the latest information available as of December 31, 2022 (in thousands). The credit ratings are sourced from nationally recognized rating agencies, which include Moody’s and S&P, they are presented based on asset type. All of our held-to-maturity securities were current in their payment of principal and interest as of December 31, 2022.
AA+Total
Held-to-maturity securities:
  Debt issued by the U.S. government-sponsored agencies$124,455 124,455 
  Residential mortgage-backed securities756,794 756,794 
Total marketable securities held-to-maturity$881,249 881,249