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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost of Securities and Fair Values
The following tables summarize the amortized cost, allowance for credit losses and fair value of the AFS debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive loss, net at June 30, 2024 and December 31, 2023:  
June 30, 2024
 Amortized cost Gross unrealized gains Gross unrealized losses Allowance for credit losses on investments Fair Value
Investment Securities    
AFS debt securities  
U.S. government agency securities$428,514 $962 $(868)$— $428,608 
Mortgage-backed securities - residential1,021,125 439 (157,292)— 864,272 
Mortgage-backed securities - commercial 17,398 — (1,295)— 16,103 
Municipal securities194,050 33 (24,106)— 169,977 
Corporate securities3,500 — (81)— 3,419 
Total$1,664,587 $1,434 $(183,642)$— $1,482,379 
December 31, 2023
 Amortized costGross unrealized gains Gross unrealized losses Allowance for credit losses on investmentsFair Value
Investment Securities    
AFS debt securities    
U.S. government agency securities$204,663 $470 $(1,177)$— $203,956 
Mortgage-backed securities - residential1,057,389 — (160,418)— 896,971 
Mortgage-backed securities - commercial18,186 — (1,225)— 16,961 
Municipal securities263,312 370 (21,419)— 242,263 
U.S. Treasury securities111,729 — (3,233)— 108,496 
Corporate securities3,500 — (174)— 3,326 
Total$1,658,779 $840 $(187,646)$— $1,471,973 
Schedule of Gross Unrealized Losses
The following tables show gross unrealized losses on AFS debt securities for which an allowance for credit losses has not been recorded at June 30, 2024 and December 31, 2023, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
June 30, 2024
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized Loss Fair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$191,125 $(232)$7,218 $(636)$198,343 $(868)
Mortgage-backed securities - residential— — 754,282 (157,292)754,282 (157,292)
Mortgage-backed securities - commercial— — 16,103 (1,295)16,103 (1,295)
Municipal securities31,931 (2,197)132,733 (21,909)164,664 (24,106)
Corporate securities— — 3,419 (81)3,419 (81)
Total$223,056 $(2,429)$913,755 $(181,213)$1,136,811 $(183,642)
 December 31, 2023
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized LossFair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$25,923 $(21)$14,040 $(1,156)$39,963 $(1,177)
Mortgage-backed securities - residential— — 896,971 (160,418)896,971 (160,418)
Mortgage-backed securities - commercial— — 16,961 (1,225)16,961 (1,225)
Municipal securities14,480 (148)188,669 (21,271)203,149 (21,419)
U.S. Treasury securities— — 108,496 (3,233)108,496 (3,233)
Corporate securities— — 3,326 (174)3,326 (174)
Total$40,403 $(169)$1,228,463 $(187,477)$1,268,866 $(187,646)
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity
June 30,December 31,
 2024 2023 
 Available-for-saleAvailable-for-sale
 Amortized costFair ValueAmortized costFair Value
Due in one year or less$3,188 $3,174 $64,776 $64,279 
Due in one to five years10,586 9,832 75,996 71,801 
Due in five to ten years157,552 156,768 51,162 49,630 
Due in over ten years454,738 432,230 391,270 372,331 
626,064 602,004 583,204 558,041 
Mortgage-backed securities - residential1,021,125 864,272 1,057,389 896,971 
Mortgage-backed securities - commercial17,398 16,103 18,186 16,961 
Total AFS debt securities$1,664,587 $1,482,379 $1,658,779 $1,471,973 
Schedule of Sales and Other Dispositions of Available-for-Sale Securities
Sales and other dispositions of AFS debt securities were as follows:
 Three Months Ended June 30,Six Months Ended June 30,
 2024 2023 2024 2023 
Proceeds from sales$— $— $207,882 $— 
Proceeds from maturities, prepayments and calls67,609 31,588 134,236 58,415 
Gross realized gains— — 90 — 
Gross realized losses— — 16,303 —