v3.26.1
Investment Securities - Schedule of Amortized Cost of Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity $ 7,695,049 $ 7,969,672
Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 15,063 16,791
Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 2,569,979 2,767,869
Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 4,253,522 4,295,308
Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 794,654 824,734
CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 61,831 64,970
Aaa    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 354,523 363,636
Aaa | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aaa | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aaa | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aaa | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 292,692 298,666
Aaa | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 61,831 64,970
Aa1    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 6,982,250 7,233,155
Aa1 | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 15,063 16,791
Aa1 | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 2,569,979 2,767,869
Aa1 | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 4,253,522 4,295,308
Aa1 | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 143,686 153,187
Aa1 | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa2    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 233,254 234,269
Aa2 | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa2 | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa2 | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa2 | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 233,254 234,269
Aa2 | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa3    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 82,711 112,482
Aa3 | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa3 | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa3 | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Aa3 | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 82,711 112,482
Aa3 | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A1    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 20,099 9,539
A1 | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A1 | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A1 | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A1 | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 20,099 9,539
A1 | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A2    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 7,053 4,165
A2 | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A2 | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A2 | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
A2 | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 7,053 4,165
A2 | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Not Rated    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 15,159 12,426
Not Rated | Agency CMO    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Not Rated | Agency MBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Not Rated | Agency CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 0 0
Not Rated | Municipal bonds and notes    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity 15,159 12,426
Not Rated | CMBS    
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]    
Total held-to-maturity $ 0 $ 0