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Investment Securities - Schedule of FV Gross Unrealized Losses by Length of Time that the Individual AFS and HTM Securities Have Been in a Continuous Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 239 244
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 2,498 $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses (3) (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value 1,421,089 1,493,993
Investment securities available-for-sale, 12 months or greater, unrealized losses (117,137) (161,952)
Investment securities available-for-sale, Estimated fair value 1,423,587 1,497,077
Investment securities available-for-sale, Unrealized losses $ (117,140) $ (161,956)
Investment securities held-to-maturity, Number of securities | security 225,000 228
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 3,503 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses (23) 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 851,878 885,977
Investment securities held-to-maturity, 12 months or greater, unrealized losses (94,714) (116,116)
Investment securities held-to-maturity, Estimated Fair Value 855,381 885,977
Investment securities held-to-maturity, Unrealized losses $ (94,737) $ (116,116)
U.S. treasury bonds    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 2 2
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 49,403 47,901
Investment securities available-for-sale, 12 months or greater, unrealized losses (567) (1,993)
Investment securities available-for-sale, Estimated fair value 49,403 47,901
Investment securities available-for-sale, Unrealized losses $ (567) $ (1,993)
U. S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 76 78
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 2,498 $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses (3) (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value 650,779 668,313
Investment securities available-for-sale, 12 months or greater, unrealized losses (37,419) (57,689)
Investment securities available-for-sale, Estimated fair value 653,277 671,397
Investment securities available-for-sale, Unrealized losses $ (37,422) $ (57,693)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 146 149
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 660,627 718,042
Investment securities available-for-sale, 12 months or greater, unrealized losses (75,086) (96,684)
Investment securities available-for-sale, Estimated fair value 660,627 718,042
Investment securities available-for-sale, Unrealized losses $ (75,086) $ (96,684)
Investment securities held-to-maturity, Number of securities | security 141,000 142
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 554,939 590,063
Investment securities held-to-maturity, 12 months or greater, unrealized losses (66,264) (79,980)
Investment securities held-to-maturity, Estimated Fair Value 554,939 590,063
Investment securities held-to-maturity, Unrealized losses $ (66,264) $ (79,980)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 13 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 50,216 49,564
Investment securities available-for-sale, 12 months or greater, unrealized losses (3,495) (4,993)
Investment securities available-for-sale, Estimated fair value 50,216 49,564
Investment securities available-for-sale, Unrealized losses $ (3,495) $ (4,993)
Investment securities held-to-maturity, Number of securities | security 16,000 16
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 79,261 77,360
Investment securities held-to-maturity, 12 months or greater, unrealized losses (10,008) (12,867)
Investment securities held-to-maturity, Estimated Fair Value 79,261 77,360
Investment securities held-to-maturity, Unrealized losses $ (10,008) $ (12,867)
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 8,267 8,490
Investment securities available-for-sale, 12 months or greater, unrealized losses (385) (293)
Investment securities available-for-sale, Estimated fair value 8,267 8,490
Investment securities available-for-sale, Unrealized losses $ (385) $ (293)
Investment securities held-to-maturity, Number of securities | security 38,000 40
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 3,503 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses (23) 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 107,779 113,031
Investment securities held-to-maturity, 12 months or greater, unrealized losses (8,001) (8,540)
Investment securities held-to-maturity, Estimated Fair Value 111,282 113,031
Investment securities held-to-maturity, Unrealized losses $ (8,024) $ (8,540)
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 1,797 1,683
Investment securities available-for-sale, 12 months or greater, unrealized losses (185) (300)
Investment securities available-for-sale, Estimated fair value 1,797 1,683
Investment securities available-for-sale, Unrealized losses $ (185) $ (300)
Investment securities held-to-maturity, Number of securities | security 30,000 30
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 109,899 105,523
Investment securities held-to-maturity, 12 months or greater, unrealized losses (10,441) (14,729)
Investment securities held-to-maturity, Estimated Fair Value 109,899 105,523
Investment securities held-to-maturity, Unrealized losses $ (10,441) $ (14,729)