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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2021 USD ($) Position | Dec. 31, 2020 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 811,115 | $ 213,643
12 months or longer | 253,578 | 800
Total | 1,064,693 | 214,443
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (13,238) | (2,170)
12 months or longer | (8,704) | (9)
Total | $ (21,942) | $ (2,179)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 127 | 19
12 months or longer | Position | 22 | 4
Total | Position | 149 | 23
AIR on AFS debt securities | $ 3,900 | $ 3,300
U.S. Treasury [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 49,105 |
12 months or longer | 0 |
Total | 49,105 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (6) |
12 months or longer | 0 |
Total | $ (6) |
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 |
12 months or longer | Position | 0 |
Total | Position | 2 |
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 41,618 | 148,537
12 months or longer | 198,313 | 0
Total | 239,931 | 148,537
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (1,846) | (2,052)
12 months or longer | (6,677) | 0
Total | $ (8,523) | $ (2,052)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 4 | 10
12 months or longer | Position | 12 | 0
Total | Position | 16 | 10
State & Municipal [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 87,515 |
12 months or longer | 0 |
Total | 87,515 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (1,559) |
12 months or longer | 0 |
Total | $ (1,559) |
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 61 |
12 months or longer | Position | 0 |
Total | Position | 61 |
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 281,217 | $ 47,269
12 months or longer | 39,491 | 800
Total | 320,708 | 48,069
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (4,319) | (60)
12 months or longer | (1,525) | (9)
Total | $ (5,844) | $ (69)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 24 | 3
12 months or longer | Position | 6 | 4
Total | Position | 30 | 7
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 341,673 | $ 17,837
12 months or longer | 15,774 | 0
Total | 357,447 | 17,837
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (5,495) | (58)
12 months or longer | (502) | 0
Total | $ (5,997) | $ (58)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 34 | 6
12 months or longer | Position | 4 | 0
Total | Position | 38 | 6
Corporate [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 9,987 |
12 months or longer | 0 |
Total | 9,987 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (13) |
12 months or longer | 0 |
Total | $ (13) |
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 |
12 months or longer | Position | 0 |
Total | Position | 2 |

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