Investment Securities (Pledged Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
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	$ 851,966	$ 547,244
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	143,467	28,287
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	7,036	$ 2,175
Interest Rate Swap [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	$ 36,314