Investment Securities Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Due within 1 year	$ 1,800
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	1,807
Due after 1 but within 5 years	5,568
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	5,616
Due after 5 but within 10 years	43,207
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	42,769
Due after 10 years	3,496
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,520
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	54,071
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	53,712
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost	493,986
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	493,631
Debt Securities, Held-to-maturity	548,057	$ 361,844
Securities held to maturity, fair value	547,343	$ 369,851
US Government Agencies Residential Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	98,700
Securities held to maturity, fair value	98,500
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	395,300
Securities held to maturity, fair value	$ 395,100