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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 28 | 116
Fair Value, Less Than 12 Months | $ 136,557 | $ 663,656
Unrealized Losses, Less Than 12 Months | $ (4,384) | $ (46,120)
Number of Securities, 12 Months or More | security | 121 | 31
Fair Value, 12 Months or More | $ 817,710 | $ 308,067
Unrealized Losses, 12 Months or More | $ (111,044) | $ (56,462)
Number of Securities, Total | security | 149 | 147
Fair Value, Total | $ 954,267 | $ 971,723
Unrealized Losses, Total | $ (115,428) | $ (102,582)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 1 | 6
Fair Value, Less Than 12 Months | $ 9,895 | $ 57,057
Unrealized Losses, Less Than 12 Months | $ (203) | $ (3,363)
Number of Securities, 12 Months or More | security | 13 | 8
Fair Value, 12 Months or More | $ 120,142 | $ 74,638
Unrealized Losses, 12 Months or More | $ (14,335) | $ (10,358)
Number of Securities, Total | security | 14 | 14
Fair Value, Total | $ 130,037 | $ 131,695
Unrealized Losses, Total | $ (14,538) | $ (13,721)
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 0 | 6
Fair Value, Less Than 12 Months | $ 0 | $ 41,811
Unrealized Losses, Less Than 12 Months | $ 0 | $ (1,668)
Number of Securities, 12 Months or More | security | 6 | 0
Fair Value, 12 Months or More | $ 42,049 | $ 0
Unrealized Losses, 12 Months or More | $ (1,328) | $ 0
Number of Securities, Total | security | 6 | 6
Fair Value, Total | $ 42,049 | $ 41,811
Unrealized Losses, Total | $ (1,328) | $ (1,668)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 8 | 47
Fair Value, Less Than 12 Months | $ 78,608 | $ 296,509
Unrealized Losses, Less Than 12 Months | $ (2,402) | $ (28,153)
Number of Securities, 12 Months or More | security | 57 | 13
Fair Value, 12 Months or More | $ 351,370 | $ 112,902
Unrealized Losses, 12 Months or More | $ (60,979) | $ (25,682)
Number of Securities, Total | security | 65 | 60
Fair Value, Total | $ 429,978 | $ 409,411
Unrealized Losses, Total | $ (63,381) | $ (53,835)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 12 | 25
Fair Value, Less Than 12 Months | $ 319 | $ 7,143
Unrealized Losses, Less Than 12 Months | $ (7) | $ (589)
Number of Securities, 12 Months or More | security | 14 | 3
Fair Value, 12 Months or More | $ 36,567 | $ 34,223
Unrealized Losses, 12 Months or More | $ (8,909) | $ (7,245)
Number of Securities, Total | security | 26 | 28
Fair Value, Total | $ 36,886 | $ 41,366
Unrealized Losses, Total | $ (8,916) | $ (7,834)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 2 | 30
Fair Value, Less Than 12 Months | $ 18,525 | $ 241,009
Unrealized Losses, Less Than 12 Months | $ (591) | $ (11,975)
Number of Securities, 12 Months or More | security | 31 | 7
Fair Value, 12 Months or More | $ 267,582 | $ 86,304
Unrealized Losses, 12 Months or More | $ (25,493) | $ (13,177)
Number of Securities, Total | security | 33 | 37
Fair Value, Total | $ 286,107 | $ 327,313
Unrealized Losses, Total | $ (26,084) | $ (25,152)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Securities, Less Than 12 Months | security | 5 | 2
Fair Value, Less Than 12 Months | $ 29,210 | $ 20,127
Unrealized Losses, Less Than 12 Months | $ (1,181) | $ (372)
Number of Securities, 12 Months or More | security | 0 | 0
Fair Value, 12 Months or More | $ 0 | $ 0
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of Securities, Total | security | 5 | 2
Fair Value, Total | $ 29,210 | $ 20,127
Unrealized Losses, Total | $ (1,181) | $ (372)

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