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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
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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)

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