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Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]            
Loss on sale of securities $ 0 $ 0 $ (59,946) $ 0 $ (59,946)  
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 91,311     91,311   $ 564,892
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (259)     (259)   (3,247)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,350,618     1,350,618   1,365,958
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (212,526)     (212,526)   (277,257)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,441,929     1,441,929   1,930,850
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (212,785)     (212,785)   (280,504)
Agency residential MBS            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 844,155     844,155   861,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (147,135)     (147,135)   (189,761)
Debt Securities, Available-for-sale, Unrealized Loss Position 844,155     844,155   861,840
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (147,135)     (147,135)   (189,761)
Agency commercial MBS            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4,997     4,997   40,291
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3)     (3)   (87)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 31,993     31,993   11,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,178)     (1,178)   (959)
Debt Securities, Available-for-sale, Unrealized Loss Position 36,990     36,990   51,564
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,181)     (1,181)   (1,046)
Agency residential CMOs            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 53,802     53,802   273,347
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (181)     (181)   (1,994)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 102,342     102,342   104,757
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16,090)     (16,090)   (18,917)
Debt Securities, Available-for-sale, Unrealized Loss Position 156,144     156,144   378,104
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (16,271)     (16,271)   (20,911)
Municipal securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months           0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss           0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer           594
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss           (8)
Debt Securities, Available-for-sale, Unrealized Loss Position           594
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax           (8)
Corporate debt securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3,747     3,747   15,968
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3)     (3)   (32)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 230,586     230,586   241,744
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (19,412)     (19,412)   (31,354)
Debt Securities, Available-for-sale, Unrealized Loss Position 234,333     234,333   257,712
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (19,415)     (19,415)   (31,386)
Private label residential CMOs            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   180,915
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   (1,031)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 127,824     127,824   129,178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (28,113)     (28,113)   (34,681)
Debt Securities, Available-for-sale, Unrealized Loss Position 127,824     127,824   310,093
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (28,113)     (28,113)   (35,712)
Collateralized loan obligations            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 28,765     28,765   38,771
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (72)     (72)   (29)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Unrealized Loss Position 28,765     28,765   38,771
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (72)     (72)   (29)
Private label commercial MBS            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,274     10,274   12,372
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (407)     (407)   (1,213)
Debt Securities, Available-for-sale, Unrealized Loss Position 10,274     10,274   12,372
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (407)     (407)   (1,213)
Asset-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months           15,600
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss           (74)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer           0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss           0
Debt Securities, Available-for-sale, Unrealized Loss Position           15,600
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax           (74)
SBA securities            
Debt Securities, Available-for-sale [Line Items]            
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0     0   0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0     0   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,444     3,444   4,200
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (191)     (191)   (364)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,444     3,444   4,200
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ (191)     $ (191)   $ (364)