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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale: |  |
Less than 12 months, fair value | $ 760,153 | $ 2,778,014
Less than 12 months, unrealized losses | 6,466 | 16,025
Longer than 12 months, fair value | 351,841 | 332,953
Longer than 12 months, unrealized losses | 2,445 | 1,794
Total fair value | 1,111,994 | 3,110,967
Total unrealized losses | 8,911 | 17,819
Government Agency |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 268,622 | 347,081
Less than 12 months, unrealized losses | 3,197 | 1,827
Longer than 12 months, fair value | 328,777 | 63,947
Longer than 12 months, unrealized losses | 2,376 | 414
Total fair value | 597,399 | 411,028
Total unrealized losses | 5,573 | 2,241
Residential Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 433,816 | 2,387,293
Less than 12 months, unrealized losses | 1,241 | 14,016
Longer than 12 months, fair value | 23,064 | 264,257
Longer than 12 months, unrealized losses | 69 | 1,371
Total fair value | 456,880 | 2,651,550
Total unrealized losses | 1,310 | 15,387
Commercial Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Less than 12 months, fair value |  | 35,926
Less than 12 months, unrealized losses |  | 59
Longer than 12 months, fair value |  | 0
Longer than 12 months, unrealized losses |  | 0
Total fair value |  | 35,926
Total unrealized losses |  | 59
Corporate Bonds |  |
Investment securities available for sale: |  |
Less than 12 months, fair value | 57,715 | 7,714
Less than 12 months, unrealized losses | 2,028 | 123
Longer than 12 months, fair value | 0 | 4,749
Longer than 12 months, unrealized losses | 0 | 9
Total fair value | 57,715 | 12,463
Total unrealized losses | $ 2,028 | $ 132

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