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Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2019 USD ($) Position | Dec. 31, 2018 USD ($) Position
--- | --- | ---
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 4,342 | $ 32,295
12 months or longer | 314,696 | 835,966
Total | 319,038 | 868,261
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (10) | (137)
12 months or longer | (2,145) | (20,209)
Total | $ (2,155) | $ (20,346)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 | 20
12 months or longer | Position | 84 | 204
Total | Position | 86 | 224
Federal Agency [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 0 | $ 0
12 months or longer | 9,822 | 64,294
Total | 9,822 | 64,294
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | 0
12 months or longer | (178) | (693)
Total | $ (178) | $ (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 | $ 0 | $ 18,462
12 months or longer | 137,139 | 428,440
Total | 137,139 | 446,902
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | 0 | (65)
12 months or longer | (677) | (10,764)
Total | $ (677) | $ (10,829)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 0 | 12
12 months or longer | Position | 44 | 101
Total | Position | 44 | 113
Collateralized Mortgage Obligations [Member] |  |
Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months | $ 4,342 | $ 12,118
12 months or longer | 167,735 | 320,908
Total | 172,077 | 333,026
Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 months | (10) | (69)
12 months or longer | (1,290) | (8,518)
Total | $ (1,300) | $ (8,587)
Unrealized Loss Position, Number of Positions [Abstract] |  |
Less than 12 months | Position | 2 | 5
12 months or longer | Position | 39 | 62
Total | Position | 41 | 67

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