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Investment Securities - Schedule of Investment Securities (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Available-for-sale securities    
Amortized Cost $ 6,635,481,000 $ 4,725,539,000
Gross unrealized gains 30,480,000 2,071,000
Gross unrealized losses (429,698,000) (586,128,000)
Fair Value 6,236,263,000 4,141,482,000
Held-to-maturity securities    
Amortized Cost 3,344,165,000 3,613,720,000
Gross unrealized gains 8,864,000 1,066,000
Gross unrealized losses (567,882,000) (704,236,000)
Held-to-maturity securities, fair value 2,785,147,000 2,910,550,000
Less: Allowance for credit losses (260,000) (457,000)
Held-to-maturity securities, net of allowance for credit losses 3,343,905,000 3,613,263,000
Equity securities with readily determinable fair value    
Amortized Cost 61,211,000 220,758,000
Gross unrealized gains 6,318,000 2,905,000
Gross unrealized losses (3,759,000) (8,251,000)
Fair Value 63,770,000 215,412,000
U.S. Treasury    
Available-for-sale securities    
Amortized Cost 6,999,000 37,858,000
Gross unrealized gains 36,000 49,000
Gross unrealized losses 0 0
Fair Value 7,035,000 37,907,000
U.S. government agencies    
Available-for-sale securities    
Amortized Cost 50,000,000 50,000,000
Gross unrealized gains 0 0
Gross unrealized losses (2,529,000) (5,055,000)
Fair Value 47,471,000 44,945,000
Held-to-maturity securities    
Amortized Cost 313,541,000 313,539,000
Gross unrealized gains 0 0
Gross unrealized losses (57,269,000) (69,127,000)
Held-to-maturity securities, fair value 256,272,000 244,412,000
Municipal    
Available-for-sale securities    
Amortized Cost 162,373,000 188,405,000
Gross unrealized gains 1,643,000 528,000
Gross unrealized losses (1,850,000) (4,340,000)
Fair Value 162,166,000 184,593,000
Held-to-maturity securities    
Amortized Cost 144,192,000 161,016,000
Gross unrealized gains 451,000 243,000
Gross unrealized losses (2,012,000) (5,290,000)
Held-to-maturity securities, fair value 142,631,000 155,969,000
Corporate notes    
Held-to-maturity securities    
Amortized Cost 35,097,000 56,851,000
Gross unrealized gains 2,000 8,000
Gross unrealized losses (396,000) (1,870,000)
Held-to-maturity securities, fair value 34,703,000 54,989,000
Financial issuers    
Available-for-sale securities    
Amortized Cost 79,000,000 83,997,000
Gross unrealized gains 0 0
Gross unrealized losses (2,704,000) (3,828,000)
Fair Value 76,296,000 80,169,000
Other    
Available-for-sale securities    
Amortized Cost 1,000,000 1,000,000
Gross unrealized gains 0 0
Gross unrealized losses (1,000) (7,000)
Fair Value 999,000 993,000
Residential mortgage-backed securities    
Available-for-sale securities    
Amortized Cost 5,533,710,000 4,106,641,000
Gross unrealized gains 25,926,000 284,000
Gross unrealized losses (402,953,000) (553,287,000)
Fair Value 5,156,683,000 3,553,638,000
Held-to-maturity securities    
Amortized Cost 2,667,371,000 2,864,927,000
Gross unrealized gains 7,503,000 0
Gross unrealized losses (491,124,000) (605,014,000)
Held-to-maturity securities, fair value 2,183,750,000 2,259,913,000
Commercial (multi-family) mortgage-baked securities    
Available-for-sale securities    
Amortized Cost 280,969,000 19,064,000
Gross unrealized gains 570,000 23,000
Gross unrealized losses (4,986,000) (755,000)
Fair Value 276,553,000 18,332,000
Held-to-maturity securities    
Amortized Cost 6,293,000 6,364,000
Gross unrealized gains 72,000 0
Gross unrealized losses (92,000) (252,000)
Held-to-maturity securities, fair value 6,273,000 6,112,000
Collateralized mortgage obligations    
Available-for-sale securities    
Amortized Cost 521,430,000 238,574,000
Gross unrealized gains 2,305,000 1,187,000
Gross unrealized losses (14,675,000) (18,856,000)
Fair Value 509,060,000 220,905,000
Held-to-maturity securities    
Amortized Cost 177,671,000 211,023,000
Gross unrealized gains 836,000 815,000
Gross unrealized losses (16,989,000) (22,683,000)
Held-to-maturity securities, fair value 161,518,000 189,155,000
Mortgage-backed securities, subprime    
Available-for-sale securities    
Fair Value $ 0 $ 0