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Investment Securities - Schedule of Available-for-sale Investment Securities Portfolios (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value $ 723,180,000 $ 2,460,239,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (10,662,000) (550,821,000)
Continuous unrealized losses existing for greater than 12 months, fair value 2,376,825,000 1,430,683,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses (419,036,000) (35,307,000)
Total, fair value 3,100,005,000 3,890,922,000
Total, unrealized losses (429,698,000) (586,128,000)
Available-for-sale securities 6,236,263,000 4,141,482,000
U.S. government agencies    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 0 44,945,000
Continuous unrealized losses existing for less than 12 months, unrealized losses 0 (5,055,000)
Continuous unrealized losses existing for greater than 12 months, fair value 47,471,000 0
Continuous unrealized losses existing for greater than 12 months, unrealized losses (2,529,000) 0
Total, fair value 47,471,000 44,945,000
Total, unrealized losses (2,529,000) (5,055,000)
Available-for-sale securities 47,471,000 44,945,000
Municipal    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 36,516,000 52,344,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (142,000) (3,536,000)
Continuous unrealized losses existing for greater than 12 months, fair value 37,288,000 83,517,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses (1,708,000) (804,000)
Total, fair value 73,804,000 135,861,000
Total, unrealized losses (1,850,000) (4,340,000)
Available-for-sale securities 162,166,000 184,593,000
Financial issuers    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 0 80,169,000
Continuous unrealized losses existing for less than 12 months, unrealized losses 0 (3,828,000)
Continuous unrealized losses existing for greater than 12 months, fair value 76,296,000 0
Continuous unrealized losses existing for greater than 12 months, unrealized losses (2,704,000) 0
Total, fair value 76,296,000 80,169,000
Total, unrealized losses (2,704,000) (3,828,000)
Available-for-sale securities 76,296,000 80,169,000
Other    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 999,000 993,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (1,000) (7,000)
Continuous unrealized losses existing for greater than 12 months, fair value 0 0
Continuous unrealized losses existing for greater than 12 months, unrealized losses 0 0
Total, fair value 999,000 993,000
Total, unrealized losses (1,000) (7,000)
Available-for-sale securities 999,000 993,000
Residential mortgage-backed securities    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 378,503,000 2,212,780,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (5,976,000) (519,164,000)
Continuous unrealized losses existing for greater than 12 months, fair value 2,145,980,000 1,327,534,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses (396,977,000) (34,123,000)
Total, fair value 2,524,483,000 3,540,314,000
Total, unrealized losses (402,953,000) (553,287,000)
Available-for-sale securities 5,156,683,000 3,553,638,000
Commercial (multi-family) mortgage-baked securities    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 215,561,000 3,134,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (4,420,000) (390,000)
Continuous unrealized losses existing for greater than 12 months, fair value 6,094,000 12,204,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses (566,000) (365,000)
Total, fair value 221,655,000 15,338,000
Total, unrealized losses (4,986,000) (755,000)
Available-for-sale securities 276,553,000 18,332,000
Collateralized mortgage obligations    
Available-for-sale securities    
Continuous unrealized losses existing for less than 12 months, fair value 91,601,000 65,874,000
Continuous unrealized losses existing for less than 12 months, unrealized losses (123,000) (18,841,000)
Continuous unrealized losses existing for greater than 12 months, fair value 63,696,000 7,428,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses (14,552,000) (15,000)
Total, fair value 155,297,000 73,302,000
Total, unrealized losses (14,675,000) (18,856,000)
Available-for-sale securities 509,060,000 220,905,000
Mortgage Backed Securities, Subprime    
Available-for-sale securities    
Available-for-sale securities $ 0 $ 0