Parent Company Financial Statements (Statements of Condition) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash		$ 50,300	$ 42,900
Premises and equipment, net		42,873	45,959
Investment in subsidiaries:
Other assets		21,268	34,658
Total assets		3,864,230	3,709,344
LIABILITIES AND SHAREHOLDERS' EQUITY
Accrued interest and other liabilities		44,479	47,413
Shareholders’ equity		391,547	363,190	$ 245,109	$ 231,096
Total liabilities and shareholders’ equity		3,864,230	3,709,344
Parent Company [Member]
ASSETS
Cash		29,905	26,581
Investment in subsidiaries:
Bank		429,100	394,404
Acadia Trust(1)	[1]		10,232
Receivable from subsidiaries		107	1,926
Other assets		12,420	13,939
Total assets		471,532	447,082
LIABILITIES AND SHAREHOLDERS' EQUITY
Due to subsidiaries		37	1,216
Subordinated debentures		58,755	58,590
Accrued interest and other liabilities		21,193	24,086
Shareholders’ equity		391,547	363,190
Total liabilities and shareholders’ equity		$ 471,532	$ 447,082

[1] (1) Effective at the close of business November 30, 2016, Acadia Trust merged into Camden National Bank.