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Investment Securities (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 20,598 | $ 127,221
Available for sale - Amortized cost - more than 12 month | 296,502 | 567,531
Total Available for Sale Amortization cost | 317,100 | 694,752
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 109 | 436
Available for sale - Unrealized Loss - more than 12 month | 1,808 | 13,687
Total Available for Sale Unrealized Loss | 1,917 | 14,123
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 20,489 | 126,785
Available-for-sale, Fair Value - more than 12 month | 294,694 | 553,844
Total Available for Sale Fair Value | 315,183 | 680,629
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - more than 12 month |  | 424,740
Held to Maturity - Amortized Cost |  | 424,740
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - more than 12 month |  | 14,387
Held to Maturity- Unrealized Loss |  | 14,387
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - more than 12 Month |  | 410,353
Held to Maturity - Fair Value |  | 410,353
CMO's issued by us government sponsored agencies at loss |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 11,503 |
Available for sale - Amortized cost - more than 12 month | 35,417 | 66,230
Total Available for Sale Amortization cost | 46,920 | 66,230
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 103 |
Available for sale - Unrealized Loss - more than 12 month | 387 | 2,166
Total Available for Sale Unrealized Loss | 490 | 2,166
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 11,400 |
Available-for-sale, Fair Value - more than 12 month | 35,030 | 64,064
Total Available for Sale Fair Value | 46,430 | 64,064
FNMA and FHLMC [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 4,919 | 109,772
Available for sale - Amortized cost - more than 12 month | 259,099 | 357,955
Total Available for Sale Amortization cost | 264,018 | 467,727
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 2 | 348
Available for sale - Unrealized Loss - more than 12 month | 1,415 | 8,603
Total Available for Sale Unrealized Loss | 1,417 | 8,951
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 4,917 | 109,424
Available-for-sale, Fair Value - more than 12 month | 257,684 | 349,352
Total Available for Sale Fair Value | 262,601 | 458,776
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 3,549 | 17,126
Available for sale - Amortized cost - more than 12 month | 19 | 131,044
Total Available for Sale Amortization cost | 3,568 | 148,170
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 4 | 88
Available for sale - Unrealized Loss - more than 12 month | 0 | 2,739
Total Available for Sale Unrealized Loss | 4 | 2,827
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 3,545 | 17,038
Available-for-sale, Fair Value - more than 12 month | 19 | 128,305
Total Available for Sale Fair Value | 3,564 | 145,343
Obligation of US Government sponsored agencies at loss [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - more than 12 month | 1,967 | 2,325
Total Available for Sale Amortization cost | 1,967 | 2,325
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 6 | 60
Total Available for Sale Unrealized Loss | 6 | 60
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 1,961 | 2,265
Total Available for Sale Fair Value | 1,961 | 2,265
US Treasury Securities at loss |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 627 | 323
Available for sale - Amortized cost - more than 12 month | 0 | 9,977
Total Available for Sale Amortization cost | 627 | 10,300
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 0 | 0
Available for sale - Unrealized Loss - more than 12 month | 0 | 119
Total Available for Sale Unrealized Loss | 0 | 119
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 627 | 323
Available-for-sale, Fair Value - more than 12 month | 0 | 9,858
Total Available for Sale Fair Value | $ 627 | $ 10,181

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