Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Time certificates of deposit least amount	$ 100,000	$ 100,000
Held to Maturity, Fair Value, Total	$ 623,156,000	$ 603,640,000
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	75,000,000	75,000,000
Common Stock, unvested restricted Stock awards	155,012	153,429
Shares Held in Rabbi Trust	144,166	153,226
Common Stock Outstanding
Common Stock, Shares, Outstanding	28,137,504	28,080,408
Junior Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 116,000	$ 118,000
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	701,000	272,000
Short-term Debt [Member]
Unamortized Debt Issuance Expense	7,000	0
Long-term Debt [Member]
Unamortized Debt Issuance Expense	$ 86,000	$ 0