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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within 1 year		$ 520
Due after 1 but within 5 years		7,218
Due after 5 but within 10 years		34,993
Due after 10 years		0
Amortized Cost		42,731
Debt Securities, Held-to-maturity		393,855	$ 422,096
Estimated Fair Value
Due within 1 year		519
Due after 1 but within 5 years		7,210
Due after 5 but within 10 years		34,864
Due after 10 years		0
Estimated Fair Value		42,593
Securities held to maturity, fair value		383,993	$ 418,249
Mortgage-Backed Securities [Member]
Amortized Cost
Debt Securities, Held-to-maturity	[1]	351,124
Estimated Fair Value
Securities held to maturity, fair value	[1]	341,400
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member]
Amortized Cost
Debt Securities, Held-to-maturity		58,900
Estimated Fair Value
Securities held to maturity, fair value		56,400
Mortgage-Backed Securities [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Amortized Cost
Debt Securities, Held-to-maturity		292,300
Estimated Fair Value
Securities held to maturity, fair value		$ 285,000
[1] Mortgage Backed Securities include an amortized cost of $58.9 million and a fair value of $56.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $292.3 million and a fair value of $285.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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