Investment Securities (Pledged Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
deposits and repurchase agreements [Member] | Available-for-sale securities
Debt Securities, Available-for-sale [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 572,848	$ 527,655
deposits and repurchase agreements [Member] | Held-to-maturity securities
Debt Securities, Available-for-sale [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	19,263	12,975
federal home loan bank and federal reserve bank [Member] | Available-for-sale securities
Debt Securities, Available-for-sale [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	92,651	44,618
federal home loan bank and federal reserve bank [Member] | Held-to-maturity securities
Debt Securities, Available-for-sale [Line Items]
Pledged Financial Instruments, Not Separately Reported, Other Debt Securities Available-for-sale or Held-for-investment	$ 13,587	$ 14,155