Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Held to Maturity, Fair Value, Total	$ 1,210,938	$ 1,064,133
Debt Securities, Available-for-sale, Amortized Cost	$ 1,646,938	$ 1,583,736
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, Shares, Outstanding	47,377,125	47,349,778
Common Stock, unvested restricted Stock awards	144,733	135,273
Shares Held in Rabbi Trust	82,223	82,565
Common Stock Outstanding
Common Stock, Shares, Outstanding	47,377,125	47,349,778
Subordinated Debt [Member]
Unamortized Debt Issuance Expense	$ 186	$ 209