Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 512
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	512
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	2,741	$ 387
Debt Securities, Held-to-maturity	357,890	393,855
Securities held to maturity, fair value	360,224	$ 383,993
Due after 1 but within 5 years	8,084
Due after 5 but within 10 years	33,902
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	34,464
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	8,144
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	42,498
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	43,120
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	315,392
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	317,104
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	57,800
Securities held to maturity, fair value	57,900
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	257,600
Securities held to maturity, fair value	$ 259,200