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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2019 USD ($) Position | Dec. 31, 2018 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 198,501 | $ 32,295
12 months or longer | 97,243 | 835,966
Total | 295,744 | 868,261
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (718) | (137)
12 months or longer | (815) | (20,209)
Total | $ (1,533) | $ (20,346)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 48 | 20
12 months or longer | Position | 34 | 204
Total | Position | 82 | 224
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 14,891 | $ 0
12 months or longer | 9,866 | 64,294
Total | 24,757 | 64,294
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (109) | 0
12 months or longer | (134) | (693)
Total | $ (243) | $ (693)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 | 0
12 months or longer | Position | 1 | 6
Total | Position | 3 | 6
State & Municipal [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 2,503 | $ 1,715
12 months or longer | 0 | 22,324
Total | 2,503 | 24,039
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (20) | (3)
12 months or longer | 0 | (234)
Total | $ (20) | $ (237)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 1 | 3
12 months or longer | Position | 0 | 35
Total | Position | 1 | 38
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 67,986 | $ 18,462
12 months or longer | 37,745 | 428,440
Total | 105,731 | 446,902
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (273) | (65)
12 months or longer | (122) | (10,764)
Total | $ (395) | $ (10,829)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 21 | 12
12 months or longer | Position | 16 | 101
Total | Position | 37 | 113
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 113,121 | $ 12,118
12 months or longer | 49,632 | 320,908
Total | 162,753 | 333,026
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (316) | (69)
12 months or longer | (559) | (8,518)
Total | $ (875) | $ (8,587)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 24 | 5
12 months or longer | Position | 17 | 62
Total | Position | 41 | 67

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