Parent Company Financial Statements (Statements of Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment in subsidiaries:
Other assets	$ 43,451	$ 36,606
Total assets	4,297,435	4,065,398
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued interest and other liabilities	55,621	49,996
Shareholders’ equity	435,825	403,413	$ 391,547	$ 363,190
Total liabilities and shareholders’ equity	4,297,435	4,065,398
Parent Company [Member]
ASSETS
Cash	32,367	29,365
Investment in subsidiaries:
Investment in subsidiary	464,885	444,235
Receivable from subsidiary	48	107
Other assets	15,458	14,806
Total assets	512,758	488,513
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	59,067	58,911
Due to subsidiary	40	17
Accrued interest and other liabilities	17,826	26,172
Shareholders’ equity	435,825	403,413
Total liabilities and shareholders’ equity	$ 512,758	$ 488,513