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Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 610
From one to five years	51,922
From five to ten years	161,292
After ten years	746,029
Amortized cost	959,853	$ 1,017,626
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	610
From one to five years	51,573
From five to ten years	160,434
After ten years	739,242
Fair value	$ 951,859	$ 998,496

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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