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Investment Securities - Schedule of Continuous Unrealized Loss on AFS and HTM Securities (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 214 235
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 9,830
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 (136)
Investment securities available-for-sale, 12 months or greater, estimated fair value 1,035,231 1,256,180
Investment securities available-for-sale, 12 months or greater, unrealized losses (88,469) (141,409)
Investment securities available-for-sale, Estimated fair value 1,035,231 1,266,010
Investment securities available-for-sale, Unrealized losses $ (88,469) $ (141,545)
Investment securities held-to-maturity, Number of securities | security 212 222
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 6,216 $ 5,954
Investment securities held-to-maturity, Less than 12 months, unrealized losses (574) (152)
Investment securities held-to-maturity, 12 months or greater, estimated fair value 771,624 804,394
Investment securities held-to-maturity, 12 months or greater, unrealized losses (86,406) (119,419)
Investment securities held-to-maturity, Estimated Fair Value 777,840 810,348
Investment securities held-to-maturity, Unrealized losses $ (86,980) $ (119,571)
U.S. treasury bonds    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security   1
Investment securities available-for-sale, Less than 12 months, estimated fair value   $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses   0
Investment securities available-for-sale, 12 months or greater, estimated fair value   24,776
Investment securities available-for-sale, 12 months or greater, unrealized losses   (212)
Investment securities available-for-sale, Estimated fair value   24,776
Investment securities available-for-sale, Unrealized losses   $ (212)
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 58 71
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 2,300
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 (8)
Investment securities available-for-sale, 12 months or greater, estimated fair value 412,213 556,235
Investment securities available-for-sale, 12 months or greater, unrealized losses (20,394) (41,734)
Investment securities available-for-sale, Estimated fair value 412,213 558,535
Investment securities available-for-sale, Unrealized losses $ (20,394) $ (41,742)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 142 148
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 7,530
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 (128)
Investment securities available-for-sale, 12 months or greater, estimated fair value 569,707 616,392
Investment securities available-for-sale, 12 months or greater, unrealized losses (64,701) (94,407)
Investment securities available-for-sale, Estimated fair value 569,707 623,922
Investment securities available-for-sale, Unrealized losses $ (64,701) $ (94,535)
Investment securities held-to-maturity, Number of securities | security 136 140
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 0 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses 0 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 496,400 519,963
Investment securities held-to-maturity, 12 months or greater, unrealized losses (62,442) (85,941)
Investment securities held-to-maturity, Estimated Fair Value 496,400 519,963
Investment securities held-to-maturity, Unrealized losses $ (62,442) $ (85,941)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 12 13
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 0
Investment securities available-for-sale, 12 months or greater, estimated fair value 43,430 48,945
Investment securities available-for-sale, 12 months or greater, unrealized losses (2,783) (4,303)
Investment securities available-for-sale, Estimated fair value 43,430 48,945
Investment securities available-for-sale, Unrealized losses $ (2,783) $ (4,303)
Investment securities held-to-maturity, Number of securities | security 16 16
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 4,266 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses (520) 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 71,679 75,506
Investment securities held-to-maturity, 12 months or greater, unrealized losses (9,894) (13,069)
Investment securities held-to-maturity, Estimated Fair Value 75,945 75,506
Investment securities held-to-maturity, Unrealized losses $ (10,414) $ (13,069)
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 1 1
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 0
Investment securities available-for-sale, 12 months or greater, estimated fair value 7,940 8,014
Investment securities available-for-sale, 12 months or greater, unrealized losses (532) (593)
Investment securities available-for-sale, Estimated fair value 7,940 8,014
Investment securities available-for-sale, Unrealized losses $ (532) $ (593)
Investment securities held-to-maturity, Number of securities | security 33 36
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 0 $ 4,026
Investment securities held-to-maturity, Less than 12 months, unrealized losses 0 (75)
Investment securities held-to-maturity, 12 months or greater, estimated fair value 97,827 98,645
Investment securities held-to-maturity, 12 months or greater, unrealized losses (8,109) (11,314)
Investment securities held-to-maturity, Estimated Fair Value 97,827 102,671
Investment securities held-to-maturity, Unrealized losses $ (8,109) $ (11,389)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 1 1
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 0 $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 0
Investment securities available-for-sale, 12 months or greater, estimated fair value 1,941 1,818
Investment securities available-for-sale, 12 months or greater, unrealized losses (59) (160)
Investment securities available-for-sale, Estimated fair value 1,941 1,818
Investment securities available-for-sale, Unrealized losses $ (59) $ (160)
Investment securities held-to-maturity, Number of securities | security 27 30
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 1,950 $ 1,928
Investment securities held-to-maturity, Less than 12 months, unrealized losses (54) (77)
Investment securities held-to-maturity, 12 months or greater, estimated fair value 105,718 110,280
Investment securities held-to-maturity, 12 months or greater, unrealized losses (5,961) (9,095)
Investment securities held-to-maturity, Estimated Fair Value 107,668 112,208
Investment securities held-to-maturity, Unrealized losses $ (6,015) $ (9,172)