Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 6
Debt securities available for sale, Due from one to five years, Amortized Cost	94,972
Debt securities available for sale, Due after five years through ten years, Amortized Cost	136,369
Debt securities available for sale, Due after ten years, Amortized Cost	872,504
Securities available for sale, Amortized Cost	1,103,851	$ 1,127,057
Debt securities available for sale, Due in one year or less, Fair Value	6
Debt securities available for sale, Due from one to five years, Fair Value	88,334
Debt securities available for sale, Due after five years through ten years, Fair Value	121,867
Debt securities available for sale, Due after ten years, Fair Value	735,235
Debt securities available for sale, Fair Value	945,442	954,371
Debt securities held to maturity, Due in one year or less, Amortized Cost	29,636
Debt securities held to maturity, Due from one to five years, Amortized Cost	41,802
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	39,142
Debt securities held to maturity, Due after ten years, Amortized Cost	69,477
Securities held to maturity, Amortized Cost	180,057	188,980
Debt securities held to maturity, Due in one year or less, Fair Value	29,584
Debt securities held to maturity, Due from one to five years, Fair Value	41,036
Debt securities held to maturity, Due after five years through ten years, Fair Value	36,799
Debt securities held to maturity, Due after ten years, Fair Value	60,393
Securities held to maturity, Fair Value	$ 167,812	$ 174,188