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Investment Securities (Gains and losses by category) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 127,221
Available for sale - Amortized cost - more than 12 month | 835,211 | 567,531
Total Available for Sale Amortization cost | 835,231 | 694,752
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1 | 436
Available for sale - Unrealized Loss - more than 12 month | 14,882 | 13,687
Total Available for Sale Unrealized Loss | 14,883 | 14,123
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 19 | 126,785
Available-for-sale, Fair Value - more than 12 month | 820,329 | 553,844
Total Available for Sale Fair Value | 820,348 | 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 - more than 12 month | 62,927 | 66,230
Total Available for Sale Amortization cost | 62,927 | 66,230
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 1,538 | 2,166
Total Available for Sale Unrealized Loss | 1,538 | 2,166
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 61,389 | 64,064
Total Available for Sale Fair Value | 61,389 | 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 |  | 109,772
Available for sale - Amortized cost - more than 12 month | 686,773 | 357,955
Total Available for Sale Amortization cost | 686,773 | 467,727
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month |  | 348
Available for sale - Unrealized Loss - more than 12 month | 12,558 | 8,603
Total Available for Sale Unrealized Loss | 12,558 | 8,951
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month |  | 109,424
Available-for-sale, Fair Value - more than 12 month | 674,215 | 349,352
Total Available for Sale Fair Value | 674,215 | 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 | 20 | 17,126
Available for sale - Amortized cost - more than 12 month | 73,290 | 131,044
Total Available for Sale Amortization cost | 73,310 | 148,170
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1 | 88
Available for sale - Unrealized Loss - more than 12 month | 670 | 2,739
Total Available for Sale Unrealized Loss | 671 | 2,827
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 19 | 17,038
Available-for-sale, Fair Value - more than 12 month | 72,620 | 128,305
Total Available for Sale Fair Value | 72,639 | 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 | 2,238 | 2,325
Total Available for Sale Amortization cost | 2,238 | 2,325
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 42 | 60
Total Available for Sale Unrealized Loss | 42 | 60
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 2,196 | 2,265
Total Available for Sale Fair Value | 2,196 | 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 |  | 323
Available for sale - Amortized cost - more than 12 month | 9,983 | 9,977
Total Available for Sale Amortization cost | 9,983 | 10,300
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month |  | 0
Available for sale - Unrealized Loss - more than 12 month | 74 | 119
Total Available for Sale Unrealized Loss | 74 | 119
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month |  | 323
Available-for-sale, Fair Value - more than 12 month | 9,909 | 9,858
Total Available for Sale Fair Value | $ 9,909 | $ 10,181

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