Consolidated Statements Of Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Available-for-sale Securities, Noncurrent	$ 1,078,474	$ 913,978
Debt Securities, Held-to-maturity, Fair Value	1,411	1,359
Loans Held-for-sale, Fair Value Disclosure	$ 40,499	$ 11,915
Common Stock, no par value (dollars per share)	$ 0	$ 0
Common stock, authorized	40,000,000	40,000,000
Common stock, outstanding	14,909,097	15,144,719
Common stock, issued	14,909,097	15,144,719