Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Time certificates of deposit least amount	$ 100,000	$ 100,000
Held to Maturity, Fair Value, Total	809,355,000	753,263,000
Debt Securities, Available-for-sale, Amortized Cost	$ 419,452,000	$ 420,703,000
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	147,892	147,184
Shares Held in Rabbi Trust	133,857	143,820
Common Stock Outstanding
Common Stock, Shares, Outstanding	33,260,005	34,377,388
Junior Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 39,000	$ 40,000
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	375,000	399,000
Short-term Debt [Member]
Unamortized Debt Issuance Expense	0	0
Long-term Debt [Member]
Unamortized Debt Issuance Expense	$ 80,000	$ 94,000