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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2019 USD ($) Position | Dec. 31, 2018 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 36,973 | $ 32,295
12 months or longer | 673,598 | 835,966
Total | 710,571 | 868,261
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (168) | (137)
12 months or longer | (10,164) | (20,209)
Total | $ (10,332) | $ (20,346)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 7 | 20
12 months or longer | Position | 155 | 204
Total | Position | 162 | 224
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 0
12 months or longer | 9,636 | 64,294
Total | 9,636 | 64,294
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 0
12 months or longer | (364) | (693)
Total | $ (364) | $ (693)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 0
12 months or longer | Position | 1 | 6
Total | Position | 1 | 6
State & Municipal [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months |  | $ 1,715
12 months or longer |  | 22,324
Total |  | 24,039
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months |  | (3)
12 months or longer |  | (234)
Total |  | $ (237)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position |  | 3
12 months or longer | Position |  | 35
Total | Position |  | 38
Mortgage-Backed [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 234 | $ 18,462
12 months or longer | 352,339 | 428,440
Total | 352,573 | 446,902
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (2) | (65)
12 months or longer | (4,328) | (10,764)
Total | $ (4,330) | $ (10,829)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 | 12
12 months or longer | Position | 90 | 101
Total | Position | 92 | 113
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 36,739 | $ 12,118
12 months or longer | 311,623 | 320,908
Total | 348,362 | 333,026
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (166) | (69)
12 months or longer | (5,472) | (8,518)
Total | $ (5,638) | $ (8,587)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 5 | 5
12 months or longer | Position | 64 | 62
Total | Position | 69 | 67

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