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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2021 USD ($) Position | Dec. 31, 2020 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 613,836 | $ 213,643
12 months or longer | 787 | 800
Total | 614,623 | 214,443
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (17,273) | (2,170)
12 months or longer | (9) | (9)
Total | $ (17,282) | $ (2,179)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 79 | 19
12 months or longer | Position | 4 | 4
Total | Position | 83 | 23
AIR on AFS debt securities | $ 3,200 | $ 3,300
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | 238,885 | 148,537
12 months or longer | 0 | 0
Total | 238,885 | 148,537
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (9,594) | (2,052)
12 months or longer | 0 | 0
Total | $ (9,594) | $ (2,052)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 16 | 10
12 months or longer | Position | 0 | 0
Total | Position | 16 | 10
State & Municipal [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 45,370 |
12 months or longer | 0 |
Total | 45,370 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (1,151) |
12 months or longer | 0 |
Total | $ (1,151) |
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 28 |
12 months or longer | Position | 0 |
Total | Position | 28 |
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 289,888 | $ 47,269
12 months or longer | 787 | 800
Total | 290,675 | 48,069
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (5,549) | (60)
12 months or longer | (9) | (9)
Total | $ (5,558) | $ (69)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 21 | 3
12 months or longer | Position | 4 | 4
Total | Position | 25 | 7
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 32,238 | $ 17,837
12 months or longer | 0 | 0
Total | 32,238 | 17,837
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (934) | (58)
12 months or longer | 0 | 0
Total | $ (934) | $ (58)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 11 | 6
12 months or longer | Position | 0 | 0
Total | Position | 11 | 6
Corporate [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 7,455 |
12 months or longer | 0 |
Total | 7,455 |
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (45) |
12 months or longer | 0 |
Total | $ (45) |
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 3 |
12 months or longer | Position | 0 |
Total | Position | 3 |

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