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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
Jun. 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 244 244
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 12,307 $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses (112) (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value 1,408,311 1,493,993
Investment securities available-for-sale, 12 months or greater, unrealized losses (163,718) (161,952)
Investment securities available-for-sale, Estimated fair value 1,420,618 1,497,077
Investment securities available-for-sale, Unrealized losses $ (163,830) $ (161,956)
Investment securities held-to-maturity, Number of securities | security 230 228
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 3,433 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses (99) 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 840,794 885,977
Investment securities held-to-maturity, 12 months or greater, unrealized losses (128,593) (116,116)
Investment securities held-to-maturity, Estimated Fair Value 844,227 885,977
Investment securities held-to-maturity, Unrealized losses $ (128,692) $ (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 48,721 47,901
Investment securities available-for-sale, 12 months or greater, unrealized losses (1,223) (1,993)
Investment securities available-for-sale, Estimated fair value 48,721 47,901
Investment securities available-for-sale, Unrealized losses $ (1,223) $ (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 $ 2,747 $ 3,084
Investment securities available-for-sale, Less than 12 months, unrealized losses 0 (4)
Investment securities available-for-sale, 12 months or greater, estimated fair value 638,220 668,313
Investment securities available-for-sale, 12 months or greater, unrealized losses (55,685) (57,689)
Investment securities available-for-sale, Estimated fair value 640,967 671,397
Investment securities available-for-sale, Unrealized losses $ (55,685) $ (57,693)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available-for-sale, Number of securities | security 151 149
Investment securities available-for-sale, Less than 12 months, estimated fair value $ 9,560 $ 0
Investment securities available-for-sale, Less than 12 months, unrealized losses (112) 0
Investment securities available-for-sale, 12 months or greater, estimated fair value 662,646 718,042
Investment securities available-for-sale, 12 months or greater, unrealized losses (100,987) (96,684)
Investment securities available-for-sale, Estimated fair value 672,206 718,042
Investment securities available-for-sale, Unrealized losses $ (101,099) $ (96,684)
Investment securities held-to-maturity, Number of securities | security 142 142
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 548,765 590,063
Investment securities held-to-maturity, 12 months or greater, unrealized losses (89,274) (79,980)
Investment securities held-to-maturity, Estimated Fair Value 548,765 590,063
Investment securities held-to-maturity, Unrealized losses $ (89,274) $ (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 48,847 49,564
Investment securities available-for-sale, 12 months or greater, unrealized losses (5,021) (4,993)
Investment securities available-for-sale, Estimated fair value 48,847 49,564
Investment securities available-for-sale, Unrealized losses $ (5,021) $ (4,993)
Investment securities held-to-maturity, Number of securities | security 16 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 76,616 77,360
Investment securities held-to-maturity, 12 months or greater, unrealized losses (13,058) (12,867)
Investment securities held-to-maturity, Estimated Fair Value 76,616 77,360
Investment securities held-to-maturity, Unrealized losses $ (13,058) $ (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 8,182 8,490
Investment securities available-for-sale, 12 months or greater, unrealized losses (514) (293)
Investment securities available-for-sale, Estimated fair value 8,182 8,490
Investment securities available-for-sale, Unrealized losses $ (514) $ (293)
Investment securities held-to-maturity, Number of securities | security 42 40
Investment securities held-to-maturity, Less than 12 months, estimated fair value $ 3,433 $ 0
Investment securities held-to-maturity, Less than 12 months, unrealized losses (99) 0
Investment securities held-to-maturity, 12 months or greater, estimated fair value 110,203 113,031
Investment securities held-to-maturity, 12 months or greater, unrealized losses (11,160) (8,540)
Investment securities held-to-maturity, Estimated Fair Value 113,636 113,031
Investment securities held-to-maturity, Unrealized losses $ (11,259) $ (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 1,695 1,683
Investment securities available-for-sale, 12 months or greater, unrealized losses (288) (300)
Investment securities available-for-sale, Estimated fair value 1,695 1,683
Investment securities available-for-sale, Unrealized losses $ (288) $ (300)
Investment securities held-to-maturity, Number of securities | security 30 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 105,210 105,523
Investment securities held-to-maturity, 12 months or greater, unrealized losses (15,101) (14,729)
Investment securities held-to-maturity, Estimated Fair Value 105,210 105,523
Investment securities held-to-maturity, Unrealized losses $ (15,101) $ (14,729)