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Investment Securities Available-for-Sale (Details 2) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost | $ 740,187 | $ 793,634
Estimated fair value | 745,343 | 784,139
US Agency Securities [Member] |  |
One year or less, amortized cost | 114,260 | 128,148
After one year through five years, amortized cost | 103,105 | 119,856
Five years through ten years, amortized cost | 8,024 | 12,146
One year or less, estimated fair value | 114,564 | 125,545
After one year through five years, estimated fair value | 103,042 | 118,883
Five years through ten years, estimated fair value | 8,064 | 11,917
Residential Mortgage Backed Securities [Member] |  |
Amortized cost, without maturity date | 440,243 | 477,949
Estimated fair value, without maturity date | 443,545 | 472,231
Municipal Bonds [Member] |  |
One year or less, amortized cost | 6,947 | 8,097
After one year through five years, amortized cost | 13,426 | 15,025
Five years through ten years, amortized cost | 46,399 | 21,626
After ten years, amortized cost | 1,063 | 1,066
One year or less, estimated fair value | 6,977 | 8,167
After one year through five years, estimated fair value | 13,694 | 15,081
Five years through ten years, estimated fair value | 47,468 | 21,385
After ten years, estimated fair value | 1,199 | 1,136
Corporate Bonds [Member] |  |
Five years through ten years, amortized cost | 5,002 | 8,003
After ten years, amortized cost | 1,500 | 1,500
After one year through five years, estimated fair value | 5,072 | 8,076
After ten years, estimated fair value | 1,500 | 1,500
Investment Securities [Member] |  |
Amortized cost, without maturity date | 218 | 218
Amortized cost |  | 218
Estimated fair value, without maturity date | $ 218 | $ 218

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