Parent Company Financial Statements (Statements of Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment in subsidiaries:
Other assets	$ 152,388	$ 86,086
Total assets	4,898,745	4,429,521
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued Interest Payable And Other Liabilities	117,417	80,474
Shareholders’ equity	529,314	473,415	$ 435,825	$ 403,413
Total liabilities and shareholders’ equity	4,898,745	4,429,521
Parent Company [Member]
ASSETS
Cash	35,359	30,561
Investment in subsidiaries:
Investment in subsidiary	558,820	509,149
Receivable from subsidiary	46	150
Other assets	23,401	19,290
Total assets	617,626	559,150
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	59,331	59,080
Due to subsidiary		33
Accrued Interest Payable And Other Liabilities	28,981	26,622
Shareholders’ equity	529,314	473,415
Total liabilities and shareholders’ equity	$ 617,626	$ 559,150