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SELECTED QUARTERLY DATA (UNAUDITED): (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Gain on Sale of certain assets and liabilities of Insurance Brokerage Operation		$ (199)							$ 12,800	$ 0	$ 0	$ 12,822
Interest Income	$ 32,569	31,375	$ 32,903	$ 29,377	$ 29,416	$ 28,805	$ 28,128	$ 27,846
Interest Expense	2,974	2,548	2,219	1,904	1,734	1,697	1,568	1,339		9,645	6,338	4,407
NET INTEREST INCOME	29,595	28,827	30,684	27,473	27,682	27,108	26,560	26,507		116,579	107,857	104,973
Provision For Loan Losses	1,470	1,470	1,355	1,473	1,474	1,185	1,040	1,596		5,768	5,295	3,300
Net income	$ 11,056	$ 11,313	$ 15,261	$ 8,953	$ 2,616	$ 8,794	$ 8,352	$ 9,369		$ 46,583	$ 29,131	$ 38,413
Net Income Per Share (in dollars per share)	$ 0.90	$ 0.92	$ 1.25	$ 0.73	$ 0.21	$ 0.72	$ 0.68	$ 0.77		$ 3.80	$ 2.38	$ 3.12

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Gain on Sale of certain Assets and Liabilities of Insurance Brokerage Operation

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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