Investment Securities Pledged Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
federal home loan bank and federal reserve bank [Member] | Available-for-sale securities
Investment [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 1,685	$ 44,618
federal home loan bank and federal reserve bank [Member] | Held-to-maturity securities
Investment [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	11,316	14,155
deposits and repurchase agreements [Member] | Available-for-sale securities
Investment [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	547,734	527,655
deposits and repurchase agreements [Member] | Held-to-maturity securities
Investment [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 16,971	$ 12,975