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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Amortized Cost
Due within 1 year	$ 0
Due after 1 but within 5 years	108
Due after 5 but within 10 years	27,224
Due after 10 years	4,578
Amortized Cost	31,910
Held-to-maturity Securities	384,324
Estimated Fair Value
Due within 1 year	0
Due after 1 but within 5 years	108
Due after 5 but within 10 years	27,487
Due after 10 years	4,558
Estimated Fair Value	32,153
Securities held to maturity, fair value	382,341
Mortgage-Backed Securities [Member]
Amortized Cost
Held-to-maturity Securities	352,414	[1]
Estimated Fair Value
Securities held to maturity, fair value	350,188	[1]
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member]
Amortized Cost
Held-to-maturity Securities	21,600
Estimated Fair Value
Securities held to maturity, fair value	21,400
Mortgage-Backed Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Held-to-maturity Securities	330,800
Estimated Fair Value
Securities held to maturity, fair value	$ 328,800
[1] Mortgage Backed Securities include an amortized cost of $21.6 million and a fair value of $21.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $330.8 million and a fair value of $328.8 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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