Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 515
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	515
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,418	$ 387
Debt Securities, Held-to-maturity	373,453	393,855
Securities held to maturity, fair value	373,335	$ 383,993
Due after 1 but within 5 years	8,103
Due after 5 but within 10 years	34,258
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	34,779
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	8,170
Due after 10 years	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	42,876
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	43,464
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	330,577
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	329,871
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	58,200
Securities held to maturity, fair value	57,700
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	272,400
Securities held to maturity, fair value	$ 272,200