Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 1,019
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	1,023
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	9,336	$ 2,073
Debt Securities, Held-to-maturity	318,256	337,123
Securities held to maturity, fair value	327,592	$ 338,718
Due after 1 but within 5 years	10,428
Due after 5 but within 10 years	26,617
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	27,039
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	10,533
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	38,064
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	38,595
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	280,192
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	288,997
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	51,900
Securities held to maturity, fair value	52,500
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	228,300
Securities held to maturity, fair value	$ 236,500