Parent Company Financial Information (Condensed Statements of Financial Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements Captions Line Items
Other assets	$ 156,086	$ 114,296
Total assets	4,912,306	4,384,178
Long-term borrowings, net of issuance costs of $1,377 and $727, respectively	73,623	39,273
Other liabilities	86,653	74,783
Shareholders’ equity	468,363	438,947	$ 396,293	$ 381,177
Total liabilities and shareholders’ equity	4,912,306	4,384,178
Parent Company [Member]
Condensed Financial Statements Captions Line Items
Cash and due from subsidiary	31,848	7,172
Investment in and receivables due from subsidiary	511,572	471,959
Other assets	4,136	3,992
Total assets	547,556	483,123
Long-term borrowings, net of issuance costs of $1,377 and $727, respectively	73,623	39,273
Other liabilities	5,570	4,903
Shareholders’ equity	468,363	438,947
Total liabilities and shareholders’ equity	$ 547,556	$ 483,123