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Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 86
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	86
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	60	$ 345
Debt Securities, Held-to-maturity	403,019	422,096
Securities held to maturity, fair value	390,168	$ 418,249
Due after 1 but within 5 years	3,830
Due after 5 but within 10 years	37,340
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	36,775
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	3,807
Due after 10 years	1,622
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	1,606
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	42,878
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	42,274
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	360,141
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	347,894
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	60,900
Securities held to maturity, fair value	58,200
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	299,200
Securities held to maturity, fair value	$ 289,700

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