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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Amortized Cost
Due within 1 year		$ 87
Due after 1 but within 5 years		3,663
Due after 5 but within 10 years		35,361
Due after 10 years		1,629
Amortized Cost		40,740
Held-to-maturity Securities		422,096	$ 372,513
Estimated Fair Value
Due within 1 year		87
Due after 1 but within 5 years		3,660
Due after 5 but within 10 years		35,534
Due after 10 years		1,633
Estimated Fair Value		40,914
Securities held to maturity, fair value		418,249	$ 368,618
Mortgage-Backed Securities [Member]
Amortized Cost
Held-to-maturity Securities	[1]	381,356
Estimated Fair Value
Securities held to maturity, fair value	[1]	377,335
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member]
Amortized Cost
Held-to-maturity Securities		62,200
Estimated Fair Value
Securities held to maturity, fair value		60,800
Mortgage-Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Held-to-maturity Securities		319,200
Estimated Fair Value
Securities held to maturity, fair value		$ 316,600
[1] Mortgage Backed Securities include an amortized cost of $62.2 million and a fair value of $60.8 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $319.2 million and a fair value of $316.6 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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