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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 750 |
Due after one year through five years | 3,560 |
Due after five years through ten years | 2,648 |
Due after ten years | 68,049 |
Amortized Cost | 1,817,265 | $ 1,893,618
Estimated Fair Value |  |
Due within one year | 752 |
Due after one year through five years | 3,569 |
Due after five years through ten years | 2,720 |
Due after ten years | 66,856 |
Estimated Fair Value | 1,826,903 | 1,846,265
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law | 350,400 | 354,600
Collateralized mortgage obligations |  |
Amortized Cost |  |
Amortized Cost | 842,576 | 914,710
Estimated Fair Value |  |
No single maturity date | 844,899 |
Estimated Fair Value | 844,899 | 895,122
Residential |  |
Amortized Cost |  |
Amortized Cost | 369,476 | 415,659
Estimated Fair Value |  |
No single maturity date | 367,176 |
Estimated Fair Value | 367,176 | 402,605
Commercial |  |
Amortized Cost |  |
Amortized Cost | 530,206 | 481,081
Estimated Fair Value |  |
No single maturity date | 540,931 |
Estimated Fair Value | 540,931 | 469,126
Corporate securities |  |
Amortized Cost |  |
Amortized Cost | 5,000 | 5,000
Estimated Fair Value |  |
Estimated Fair Value | 3,880 | 3,826
Municipal securities |  |
Amortized Cost |  |
Amortized Cost | 70,007 | 77,168
Estimated Fair Value |  |
Estimated Fair Value | $ 70,017 | $ 75,586

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